Cleanups to do:-
-o Check line numbers assigned to all errors.
-o lex_line's use of cur_token, flags and list->token_used is a bit opaque.
o Distinguish integers, floats, and 'other' pp-numbers.
o Store ints and char constants as binary values.
o New command-line assertion syntax.
-o Work towards functions in cpperror.c taking a message level parameter.
- If we do this, merge the common code of do_warning and do_error.
o Comment all functions, and describe macro expansion algorithm.
o Move as much out of header files as possible.
o Remove single quote pairs `', and some '', from diagnostics.
#include "cpphash.h"
#include "symcat.h"
-static const cpp_token placemarker_token = {0, 0, CPP_PLACEMARKER, 0 UNION_INIT_ZERO};
+const unsigned char *_cpp_digraph_spellings [] = {U"%:", U"%:%:", U"<:",
+ U":>", U"<%", U"%>"};
+static const cpp_token placemarker_token = {0, 0, CPP_PLACEMARKER,
+ 0 UNION_INIT_ZERO};
static const cpp_token eof_token = {0, 0, CPP_EOF, 0 UNION_INIT_ZERO};
/* Flags for cpp_context. */
#define CONTEXT_PASTER (1 << 1) /* An argument context on RHS of ##. */
#define CONTEXT_RAW (1 << 2) /* If argument tokens already expanded. */
#define CONTEXT_ARG (1 << 3) /* If an argument context. */
+#define CONTEXT_VARARGS (1 << 4) /* If a varargs argument context. */
typedef struct cpp_context cpp_context;
struct cpp_context
static void push_arg_context PARAMS ((cpp_reader *, const cpp_token *));
static void free_macro_args PARAMS ((macro_args *));
-#define auto_expand_name_space(list) \
- _cpp_expand_name_space ((list), 1 + (list)->name_cap / 2)
-static void dump_param_spelling PARAMS ((FILE *, const cpp_toklist *,
- unsigned int));
-static void output_line_command PARAMS ((cpp_reader *, cpp_printer *,
- unsigned int));
-
-static void process_directive PARAMS ((cpp_reader *, const cpp_token *));
-static unsigned char *trigraph_replace PARAMS ((cpp_reader *, unsigned char *,
- unsigned char *));
-static const unsigned char *backslash_start PARAMS ((cpp_reader *,
- const unsigned char *));
+static cppchar_t handle_newline PARAMS ((cpp_buffer *, cppchar_t));
+static cppchar_t skip_escaped_newlines PARAMS ((cpp_buffer *, cppchar_t));
+static cppchar_t get_effective_char PARAMS ((cpp_buffer *));
+
static int skip_block_comment PARAMS ((cpp_reader *));
static int skip_line_comment PARAMS ((cpp_reader *));
-static void adjust_column PARAMS ((cpp_reader *, const U_CHAR *));
-static void skip_whitespace PARAMS ((cpp_reader *, int));
-static const U_CHAR *parse_name PARAMS ((cpp_reader *, cpp_token *,
- const U_CHAR *, const U_CHAR *));
-static void parse_number PARAMS ((cpp_reader *, cpp_toklist *, cpp_string *));
-static void parse_string PARAMS ((cpp_reader *, cpp_toklist *, cpp_token *,
- unsigned int));
-static int trigraph_ok PARAMS ((cpp_reader *, const unsigned char *));
-static void save_comment PARAMS ((cpp_toklist *, cpp_token *,
- const unsigned char *,
- unsigned int, unsigned int));
+static void adjust_column PARAMS ((cpp_reader *));
+static void skip_whitespace PARAMS ((cpp_reader *, cppchar_t));
+static cpp_hashnode *parse_identifier PARAMS ((cpp_reader *, cppchar_t));
+static void parse_number PARAMS ((cpp_reader *, cpp_string *, cppchar_t));
+static void parse_string PARAMS ((cpp_reader *, cpp_token *, cppchar_t));
+static void unterminated PARAMS ((cpp_reader *, unsigned int, 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_buffer *, cpp_token *));
+static void lex_dot PARAMS ((cpp_reader *, cpp_token *));
static void lex_line PARAMS ((cpp_reader *, cpp_toklist *));
+static void lex_token PARAMS ((cpp_reader *, cpp_token *));
static int lex_next PARAMS ((cpp_reader *, int));
+
static int is_macro_disabled PARAMS ((cpp_reader *, const cpp_toklist *,
const cpp_token *));
static void expand_context_stack PARAMS ((cpp_reader *));
static unsigned char * spell_token PARAMS ((cpp_reader *, const cpp_token *,
unsigned char *));
-static void output_token PARAMS ((cpp_reader *, FILE *, const cpp_token *,
- const cpp_token *, int));
typedef unsigned int (* speller) PARAMS ((unsigned char *, cpp_toklist *,
cpp_token *));
static cpp_token *make_string_token PARAMS ((cpp_token *, const U_CHAR *,
static cpp_token *duplicate_token PARAMS ((cpp_reader *, const cpp_token *));
static const cpp_token *maybe_paste_with_next PARAMS ((cpp_reader *,
const cpp_token *));
-static enum cpp_ttype can_paste PARAMS ((cpp_reader *, const cpp_token *,
- const cpp_token *, int *));
static unsigned int prevent_macro_expansion PARAMS ((cpp_reader *));
static void restore_macro_expansion PARAMS ((cpp_reader *, unsigned int));
static cpp_token *get_temp_token PARAMS ((cpp_reader *));
static void release_temp_tokens PARAMS ((cpp_reader *));
static U_CHAR * quote_string PARAMS ((U_CHAR *, const U_CHAR *, unsigned int));
-static void process_directive PARAMS ((cpp_reader *, const cpp_token *));
-
-#define INIT_TOKEN_STR(list, token) \
- do {(token)->val.str.len = 0; \
- (token)->val.str.text = (list)->namebuf + (list)->name_used; \
- } while (0)
#define VALID_SIGN(c, prevc) \
(((c) == '+' || (c) == '-') && \
((prevc) == 'e' || (prevc) == 'E' \
|| (((prevc) == 'p' || (prevc) == 'P') && !CPP_OPTION (pfile, c89))))
-/* Handle LF, CR, CR-LF and LF-CR style newlines. Assumes next
- character, if any, is in buffer. */
-
-#define handle_newline(cur, limit, c) \
- do { \
- if ((cur) < (limit) && *(cur) == '\r' + '\n' - c) \
- (cur)++; \
- pfile->buffer->lineno++; \
- pfile->buffer->line_base = (cur); \
- pfile->col_adjust = 0; \
- } while (0)
-
-#define IMMED_TOKEN() (!(cur_token->flags & PREV_WHITE))
-#define PREV_TOKEN_TYPE (cur_token[-1].type)
-
-#define PUSH_TOKEN(ttype) cur_token++->type = (ttype)
-#define REVISE_TOKEN(ttype) cur_token[-1].type = (ttype)
-#define BACKUP_TOKEN(ttype) (--cur_token)->type = (ttype)
-#define BACKUP_DIGRAPH(ttype) do { \
- BACKUP_TOKEN(ttype); cur_token->flags |= DIGRAPH;} while (0)
-
/* An upper bound on the number of bytes needed to spell a token,
including preceding whitespace. */
static inline size_t TOKEN_LEN PARAMS ((const cpp_token *));
#define IS_ARG_CONTEXT(c) ((c)->flags & CONTEXT_ARG)
#define CURRENT_CONTEXT(pfile) ((pfile)->contexts + (pfile)->cur_context)
-#define ON_REST_ARG(c) \
- (((c)->u.list->flags & VAR_ARGS) \
- && (c)->u.list->tokens[(c)->posn - 1].val.aux \
- == (unsigned int) ((c)->u.list->paramc - 1))
#define ASSIGN_FLAGS_AND_POS(d, s) \
do {(d)->flags = (s)->flags & (PREV_WHITE | BOL | PASTE_LEFT); \
#undef OP
#undef TK
-/* Notify the compiler proper that the current line number has jumped,
- or the current file name has changed. */
-
-static void
-output_line_command (pfile, print, line)
- cpp_reader *pfile;
- cpp_printer *print;
- unsigned int line;
-{
- cpp_buffer *ip = CPP_BUFFER (pfile);
-
- if (line == 0)
- return;
-
- /* End the previous line of text. */
- if (pfile->need_newline)
- {
- putc ('\n', print->outf);
- print->lineno++;
- }
- pfile->need_newline = 0;
-
- if (CPP_OPTION (pfile, no_line_commands))
- return;
-
- /* If the current file has not changed, we can output a few newlines
- instead if we want to increase the line number by a small amount.
- We cannot do this if print->lineno is zero, because that means we
- haven't output any line commands yet. (The very first line
- command output is a `same_file' command.)
-
- 'nominal_fname' values are unique, so they can be compared by
- comparing pointers. */
- if (ip->nominal_fname == print->last_fname && print->lineno > 0
- && line >= print->lineno && line < print->lineno + 8)
- {
- while (line > print->lineno)
- {
- putc ('\n', print->outf);
- print->lineno++;
- }
- return;
- }
-
- fprintf (print->outf, "# %u \"%s\"%s\n", line, ip->nominal_fname,
- cpp_syshdr_flags (pfile, ip));
-
- print->last_fname = ip->nominal_fname;
- print->lineno = line;
-}
-
-/* Like fprintf, but writes to a printer object. You should be sure
- always to generate a complete line when you use this function. */
-void
-cpp_printf VPARAMS ((cpp_reader *pfile, cpp_printer *print,
- const char *fmt, ...))
-{
- va_list ap;
-#ifndef ANSI_PROTOTYPES
- cpp_reader *pfile;
- cpp_printer *print;
- const char *fmt;
-#endif
-
- VA_START (ap, fmt);
-
-#ifndef ANSI_PROTOTYPES
- pfile = va_arg (ap, cpp_reader *);
- print = va_arg (ap, cpp_printer *);
- fmt = va_arg (ap, const char *);
-#endif
-
- /* End the previous line of text. */
- if (pfile->need_newline)
- {
- putc ('\n', print->outf);
- print->lineno++;
- }
- pfile->need_newline = 0;
-
- vfprintf (print->outf, fmt, ap);
- va_end (ap);
-}
-
-/* Scan until CPP_BUFFER (PFILE) is exhausted, discarding output. */
-
-void
-cpp_scan_buffer_nooutput (pfile)
- cpp_reader *pfile;
-{
- cpp_buffer *stop = CPP_PREV_BUFFER (CPP_BUFFER (pfile));
- const cpp_token *token;
-
- /* In no-output mode, we can ignore everything but directives. */
- for (;;)
- {
- token = _cpp_get_token (pfile);
-
- if (token->type == CPP_EOF)
- {
- cpp_pop_buffer (pfile);
- if (CPP_BUFFER (pfile) == stop)
- break;
- }
-
- if (token->type == CPP_HASH && token->flags & BOL
- && pfile->token_list.directive)
- {
- process_directive (pfile, token);
- continue;
- }
-
- _cpp_skip_rest_of_line (pfile);
- }
-}
-
-/* Scan until CPP_BUFFER (pfile) is exhausted, writing output to PRINT. */
-void
-cpp_scan_buffer (pfile, print)
- cpp_reader *pfile;
- cpp_printer *print;
-{
- cpp_buffer *stop = CPP_PREV_BUFFER (CPP_BUFFER (pfile));
- const cpp_token *token, *prev = 0;
-
- for (;;)
- {
- token = _cpp_get_token (pfile);
- if (token->type == CPP_EOF)
- {
- cpp_pop_buffer (pfile);
-
- if (CPP_BUFFER (pfile) == stop)
- return;
-
- prev = 0;
- continue;
- }
-
- if (token->flags & BOL)
- {
- output_line_command (pfile, print, pfile->token_list.line);
- prev = 0;
-
- if (token->type == CPP_HASH && pfile->token_list.directive)
- {
- process_directive (pfile, token);
- continue;
- }
- }
-
- if (token->type != CPP_PLACEMARKER)
- {
- output_token (pfile, print->outf, token, prev, 1);
- pfile->need_newline = 1;
- }
-
- prev = token;
- }
-}
-
/* Helper routine used by parse_include, which can't see spell_token.
Reinterpret the current line as an h-char-sequence (< ... >); we are
looking at the first token after the <. */
cpp_toklist *list;
unsigned int count;
{
- unsigned int n;
-
list->tokens_cap += count;
- n = list->tokens_cap;
- if (list->flags & LIST_OFFSET)
- list->tokens--, n++;
list->tokens = (cpp_token *)
- xrealloc (list->tokens, n * sizeof (cpp_token));
- if (list->flags & LIST_OFFSET)
- list->tokens++; /* Skip the dummy. */
+ xrealloc (list->tokens, list->tokens_cap * sizeof (cpp_token));
}
-/* Initialize a token list. If flags is DUMMY_TOKEN, we allocate
- an extra token in front of the token list, as this allows the lexer
- to always peek at the previous token without worrying about
- underflowing the list, and some initial space. Otherwise, no
- token- or name-space is allocated, and there is no dummy token. */
+/* Initialize a token list. If EMPTY is false, some token and name
+ space is provided. */
void
-_cpp_init_toklist (list, flags)
+_cpp_init_toklist (list, empty)
cpp_toklist *list;
- int flags;
+ int empty;
{
- if (flags == NO_DUMMY_TOKEN)
+ if (empty)
{
list->tokens_cap = 0;
list->tokens = 0;
list->name_cap = 0;
list->namebuf = 0;
- list->flags = 0;
}
else
{
- /* Initialize token space. Put a dummy token before the start
- that will fail matches. */
+ /* Initialize token space. */
list->tokens_cap = 256; /* 4K's worth. */
list->tokens = (cpp_token *)
xmalloc ((list->tokens_cap + 1) * sizeof (cpp_token));
- list->tokens[0].type = CPP_EOF;
- list->tokens++;
/* Initialize name space. */
list->name_cap = 1024;
list->namebuf = (unsigned char *) xmalloc (list->name_cap);
- list->flags = LIST_OFFSET;
}
_cpp_clear_toklist (list);
list->directive = 0;
list->paramc = 0;
list->params_len = 0;
- list->flags &= LIST_OFFSET; /* clear all but that one */
+ list->flags = 0;
}
/* Free a token list. Does not free the list itself, which may be
_cpp_free_toklist (list)
const cpp_toklist *list;
{
- if (list->flags & LIST_OFFSET)
- free (list->tokens - 1); /* Backup over dummy token. */
- else
- free (list->tokens);
+ free (list->tokens);
free (list->namebuf);
}
return !ustrcmp (token->val.node->name, (const U_CHAR *)string);
}
-/* Lexing algorithm.
-
- The original lexer in cpplib was made up of two passes: a first pass
- that replaced trigraphs and deleted esacped newlines, and a second
- pass that tokenized the result of the first pass. Tokenisation was
- performed by peeking at the next character in the input stream. For
- example, if the input stream contained "!=", the handler for the !
- character would peek at the next character, and if it were a '='
- would skip over it, and return a "!=" token, otherwise it would
- return just the "!" token.
-
- To implement a single-pass lexer, this peeking ahead is unworkable.
- An arbitrary number of escaped newlines, and trigraphs (in particular
- ??/ which translates to the escape \), could separate the '!' and '='
- in the input stream, yet the next token is still a "!=".
-
- Suppose instead that we lex by one logical line at a time, producing
- a token list or stack for each logical line, and when seeing the '!'
- push a CPP_NOT token on the list. Then if the '!' is part of a
- longer token ("!=") we know we must see the remainder of the token by
- the time we reach the end of the logical line. Thus we can have the
- '=' handler look at the previous token (at the end of the list / top
- of the stack) and see if it is a "!" token, and if so, instead of
- pushing a "=" token revise the existing token to be a "!=" token.
-
- This works in the presence of escaped newlines, because the '\' would
- have been pushed on the top of the stack as a CPP_BACKSLASH. The
- newline ('\n' or '\r') handler looks at the token at the top of the
- stack to see if it is a CPP_BACKSLASH, and if so discards both.
- Hence the '=' handler would never see any intervening tokens.
-
- To make trigraphs work in this context, as in precedence trigraphs
- are highest and converted before anything else, the '?' handler does
- lookahead to see if it is a trigraph, and if so skips the trigraph
- and pushes the token it represents onto the top of the stack. This
- also works in the particular case of a CPP_BACKSLASH trigraph.
-
- To the preprocessor, whitespace is only significant to the point of
- knowing whether whitespace precedes a particular token. For example,
- the '=' handler needs to know whether there was whitespace between it
- and a "!" token on the top of the stack, to make the token conversion
- decision correctly. So each token has a PREV_WHITE flag to
- indicate this - the standard permits consecutive whitespace to be
- regarded as a single space. The compiler front ends are not
- interested in whitespace at all; they just require a token stream.
- Another place where whitespace is significant to the preprocessor is
- a #define statment - if there is whitespace between the macro name
- and an initial "(" token the macro is "object-like", otherwise it is
- a function-like macro that takes arguments.
-
- However, all is not rosy. Parsing of identifiers, numbers, comments
- and strings becomes trickier because of the possibility of raw
- trigraphs and escaped newlines in the input stream.
-
- The trigraphs are three consecutive characters beginning with two
- question marks. A question mark is not valid as part of a number or
- identifier, so parsing of a number or identifier terminates normally
- upon reaching it, returning to the mainloop which handles the
- trigraph just like it would in any other position. Similarly for the
- backslash of a backslash-newline combination. So we just need the
- escaped-newline dropper in the mainloop to check if the token on the
- top of the stack after dropping the escaped newline is a number or
- identifier, and if so to continue the processing it as if nothing had
- happened.
-
- For strings, we replace trigraphs whenever we reach a quote or
- newline, because there might be a backslash trigraph escaping them.
- We need to be careful that we start trigraph replacing from where we
- left off previously, because it is possible for a first scan to leave
- "fake" trigraphs that a second scan would pick up as real (e.g. the
- sequence "????/\n=" would find a fake ??= trigraph after removing the
- escaped newline.)
-
- For line comments, on reaching a newline we scan the previous
- character(s) to see if it escaped, and continue if it is. Block
- comments ignore everything and just focus on finding the comment
- termination mark. The only difficult thing, and it is surprisingly
- tricky, is checking if an asterisk precedes the final slash since
- they could be separated by escaped newlines. If the preprocessor is
- invoked with the output comments option, we don't bother removing
- escaped newlines and replacing trigraphs for output.
-
- Finally, numbers can begin with a period, which is pushed initially
- as a CPP_DOT token in its own right. The digit handler checks if the
- previous token was a CPP_DOT not separated by whitespace, and if so
- pops it off the stack and pushes a period into the number's buffer
- before calling the number parser.
+/* Call when meeting a newline. Returns the character after the newline
+ (or carriage-return newline combination), or EOF. */
+static cppchar_t
+handle_newline (buffer, newline_char)
+ cpp_buffer *buffer;
+ cppchar_t newline_char;
+{
+ cppchar_t next = EOF;
-*/
+ buffer->col_adjust = 0;
+ buffer->lineno++;
+ buffer->line_base = buffer->cur;
+
+ /* Handle CR-LF and LF-CR combinations, get the next character. */
+ if (buffer->cur < buffer->rlimit)
+ {
+ 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;
+ }
+ }
-static const unsigned char *digraph_spellings [] = {U"%:", U"%:%:", U"<:",
- U":>", U"<%", U"%>"};
+ buffer->read_ahead = next;
+ return next;
+}
-/* Call when a trigraph is encountered. It warns if necessary, and
- returns true if the trigraph should be honoured. END is the third
- character of a trigraph in the input stream. */
+/* 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, end)
+trigraph_ok (pfile, from_char)
cpp_reader *pfile;
- const unsigned char *end;
+ cppchar_t from_char;
{
int accept = CPP_OPTION (pfile, trigraphs);
- if (CPP_OPTION (pfile, warn_trigraphs))
+ /* Don't warn about trigraphs in comments. */
+ if (CPP_OPTION (pfile, warn_trigraphs) && !pfile->state.lexing_comment)
{
- unsigned int col = end - 1 - pfile->buffer->line_base;
+ cpp_buffer *buffer = pfile->buffer;
if (accept)
- cpp_warning_with_line (pfile, pfile->buffer->lineno, col,
+ cpp_warning_with_line (pfile, buffer->lineno, CPP_BUF_COL (buffer) - 2,
"trigraph ??%c converted to %c",
- (int) *end, (int) _cpp_trigraph_map[*end]);
+ (int) from_char,
+ (int) _cpp_trigraph_map[from_char]);
else
- cpp_warning_with_line (pfile, pfile->buffer->lineno, col,
- "trigraph ??%c ignored", (int) *end);
+ cpp_warning_with_line (pfile, buffer->lineno, CPP_BUF_COL (buffer) - 2,
+ "trigraph ??%c ignored", (int) from_char);
}
+
return accept;
}
-/* Scan a string for trigraphs, warning or replacing them inline as
- appropriate. When parsing a string, we must call this routine
- before processing a newline character (if trigraphs are enabled),
- since the newline might be escaped by a preceding backslash
- trigraph sequence. Returns a pointer to the end of the name after
- replacement. */
+/* Assumes local variables buffer and result. */
+#define ACCEPT_CHAR(t) \
+ do { result->type = t; buffer->read_ahead = EOF; } while (0)
-static unsigned char *
-trigraph_replace (pfile, src, limit)
- cpp_reader *pfile;
- unsigned char *src;
- unsigned char *limit;
+/* 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. */
+static cppchar_t
+skip_escaped_newlines (buffer, next)
+ cpp_buffer *buffer;
+ cppchar_t next;
{
- unsigned char *dest;
+ cppchar_t next1;
+ const unsigned char *saved_cur;
+ int space;
- /* Starting with src[1], find two consecutive '?'. The case of no
- trigraphs is streamlined. */
-
- for (src++; src + 1 < limit; src += 2)
+ do
{
- if (src[0] != '?')
- continue;
+ if (buffer->cur == buffer->rlimit)
+ break;
+
+ SAVE_STATE ();
+ if (next == '?')
+ {
+ next1 = *buffer->cur++;
+ if (next1 != '?' || buffer->cur == buffer->rlimit)
+ {
+ RESTORE_STATE ();
+ break;
+ }
- /* Make src point to the 1st (NOT 2nd) of two consecutive '?'s. */
- if (src[-1] == '?')
- src--;
- else if (src + 2 == limit || src[1] != '?')
- continue;
+ next1 = *buffer->cur++;
+ if (!_cpp_trigraph_map[next1] || !trigraph_ok (buffer->pfile, next1))
+ {
+ RESTORE_STATE ();
+ break;
+ }
- /* Check if it really is a trigraph. */
- if (_cpp_trigraph_map[src[2]] == 0)
- continue;
+ /* We have a full trigraph here. */
+ next = _cpp_trigraph_map[next1];
+ if (next != '\\' || buffer->cur == 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))
+ break;
+ space = 1;
+ }
+ while (buffer->cur < buffer->rlimit);
+
+ if (!is_vspace (next1))
+ {
+ RESTORE_STATE ();
+ break;
+ }
- dest = src;
- goto trigraph_found;
+ if (space)
+ cpp_warning (buffer->pfile,
+ "backslash and newline separated by space");
+
+ next = handle_newline (buffer, next1);
+ if (next == EOF)
+ cpp_pedwarn (buffer->pfile, "backslash-newline at end of file");
}
- return limit;
+ while (next == '\\' || next == '?');
- /* Now we have a trigraph, we need to scan the remaining buffer, and
- copy-shifting its contents left if replacement is enabled. */
- for (; src + 2 < limit; dest++, src++)
- if ((*dest = *src) == '?' && src[1] == '?' && _cpp_trigraph_map[src[2]])
- {
- trigraph_found:
- src += 2;
- if (trigraph_ok (pfile, pfile->buffer->cur - (limit - src)))
- *dest = _cpp_trigraph_map[*src];
- }
-
- /* Copy remaining (at most 2) characters. */
- while (src < limit)
- *dest++ = *src++;
- return dest;
+ buffer->read_ahead = next;
+ return next;
}
-/* If CUR is a backslash or the end of a trigraphed backslash, return
- a pointer to its beginning, otherwise NULL. We don't read beyond
- the buffer start, because there is the start of the comment in the
- buffer. */
-static const unsigned char *
-backslash_start (pfile, cur)
- cpp_reader *pfile;
- const unsigned char *cur;
+/* 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 (buffer)
+ cpp_buffer *buffer;
{
- if (cur[0] == '\\')
- return cur;
- if (cur[0] == '/' && cur[-1] == '?' && cur[-2] == '?'
- && trigraph_ok (pfile, cur))
- return cur - 2;
- return 0;
+ cppchar_t next = EOF;
+
+ if (buffer->cur < buffer->rlimit)
+ {
+ 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 (buffer, next);
+ }
+
+ buffer->read_ahead = next;
+ return next;
}
-/* Skip a C-style block comment. This is probably the trickiest
- handler. We find the end of the comment by seeing if an asterisk
- is before every '/' we encounter. The nasty complication is that a
- previous asterisk may be separated by one or more escaped newlines.
- Returns non-zero if comment terminated by EOF, zero otherwise. */
+/* 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;
{
cpp_buffer *buffer = pfile->buffer;
- const unsigned char *char_after_star = 0;
- const unsigned char *cur = buffer->cur;
-
- for (; cur < buffer->rlimit; )
+ cppchar_t c = EOF, prevc = EOF;
+
+ pfile->state.lexing_comment = 1;
+ while (buffer->cur != buffer->rlimit)
{
- unsigned char c = *cur++;
+ prevc = c, c = *buffer->cur++;
- /* People like decorating comments with '*', so check for
- '/' instead for efficiency. */
+ next_char:
+ /* FIXME: For speed, create a new character class of characters
+ of no interest inside block comments. */
+ if (c == '?' || c == '\\')
+ c = skip_escaped_newlines (buffer, c);
+
+ /* People like decorating comments with '*', so check for '/'
+ instead for efficiency. */
if (c == '/')
{
- /* Don't view / then * then / as finishing the comment. */
- if ((cur[-2] == '*' && cur - 1 > buffer->cur)
- || cur - 1 == char_after_star)
- {
- buffer->cur = cur;
- return 0;
- }
+ if (prevc == '*')
+ break;
- /* Warn about potential nested comments, but not when
- the final character inside the comment is a '/'.
+ /* Warn about potential nested comments, but not if the '/'
+ comes immediately before the true comment delimeter.
Don't bother to get it right across escaped newlines. */
- if (CPP_OPTION (pfile, warn_comments) && cur + 1 < buffer->rlimit
- && cur[0] == '*' && cur[1] != '/')
+ if (CPP_OPTION (pfile, warn_comments)
+ && buffer->cur != buffer->rlimit)
{
- buffer->cur = cur;
- cpp_warning (pfile, "'/*' within comment");
+ prevc = c, c = *buffer->cur++;
+ if (c == '*' && buffer->cur != buffer->rlimit)
+ {
+ prevc = c, c = *buffer->cur++;
+ if (c != '/')
+ cpp_warning_with_line (pfile, CPP_BUF_LINE (buffer),
+ CPP_BUF_COL (buffer),
+ "\"/*\" within comment");
+ }
+ goto next_char;
}
}
else if (is_vspace (c))
{
- const unsigned char* bslash = backslash_start (pfile, cur - 2);
-
- handle_newline (cur, buffer->rlimit, c);
- /* Work correctly if there is an asterisk before an
- arbirtrarily long sequence of escaped newlines. */
- if (bslash && (bslash[-1] == '*' || bslash == char_after_star))
- char_after_star = cur;
- else
- char_after_star = 0;
+ prevc = c, c = handle_newline (buffer, c);
+ goto next_char;
}
else if (c == '\t')
- adjust_column (pfile, cur - 1);
+ adjust_column (pfile);
}
- buffer->cur = cur;
- return 1;
+ pfile->state.lexing_comment = 0;
+ buffer->read_ahead = EOF;
+ return c != '/' || prevc != '*';
}
/* Skip a C++ line comment. Handles escaped newlines. Returns
- non-zero if a multiline comment. */
+ non-zero if a multiline comment. The following new line, if any,
+ is left in buffer->read_ahead. */
static int
skip_line_comment (pfile)
cpp_reader *pfile;
{
cpp_buffer *buffer = pfile->buffer;
- register const unsigned char *cur = buffer->cur;
- int multiline = 0;
+ unsigned int orig_lineno = buffer->lineno;
+ cppchar_t c;
- for (; cur < buffer->rlimit; )
+ pfile->state.lexing_comment = 1;
+ do
{
- unsigned char c = *cur++;
+ c = EOF;
+ if (buffer->cur == buffer->rlimit)
+ break;
- if (is_vspace (c))
- {
- /* Check for a (trigaph?) backslash escaping the newline. */
- if (!backslash_start (pfile, cur - 2))
- goto out;
- multiline = 1;
- handle_newline (cur, buffer->rlimit, c);
- }
+ c = *buffer->cur++;
+ if (c == '?' || c == '\\')
+ c = skip_escaped_newlines (buffer, c);
}
- cur++;
+ while (!is_vspace (c));
- out:
- buffer->cur = cur - 1; /* Leave newline for caller. */
- return multiline;
+ pfile->state.lexing_comment = 0;
+ buffer->read_ahead = c; /* Leave any newline for caller. */
+ return orig_lineno != buffer->lineno;
}
-/* TAB points to a \t character. Update col_adjust so we track the
- column correctly. */
+/* pfile->buffer->cur is one beyond the \t character. Update
+ col_adjust so we track the column correctly. */
static void
-adjust_column (pfile, tab)
+adjust_column (pfile)
cpp_reader *pfile;
- const U_CHAR *tab;
{
- /* Zero-based column. */
- unsigned int col = CPP_BUF_COLUMN (pfile->buffer, tab);
+ 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. */
- pfile->col_adjust += (CPP_OPTION (pfile, tabstop)
- - col % CPP_OPTION (pfile, tabstop)) - 1;
+ buffer->col_adjust += (CPP_OPTION (pfile, tabstop)
+ - col % CPP_OPTION (pfile, tabstop)) - 1;
}
-/* Skips whitespace, stopping at next non-whitespace character.
- Adjusts pfile->col_adjust to account for tabs. This enables tokens
- to be assigned the correct column. */
+/* 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, in_directive)
+skip_whitespace (pfile, c)
cpp_reader *pfile;
- int in_directive;
+ cppchar_t c;
{
cpp_buffer *buffer = pfile->buffer;
- unsigned short warned = 0;
+ unsigned int warned = 0;
- /* We only want non-vertical space, i.e. ' ' \t \f \v \0. */
- while (buffer->cur < buffer->rlimit)
+ do
{
- unsigned char c = *buffer->cur;
-
- if (!is_nvspace (c))
- break;
-
- buffer->cur++;
/* Horizontal space always OK. */
if (c == ' ')
- continue;
+ ;
else if (c == '\t')
- adjust_column (pfile, buffer->cur - 1);
- /* Must be \f \v or \0. */
+ adjust_column (pfile);
+ /* Just \f \v or \0 left. */
else if (c == '\0')
{
if (!warned)
- cpp_warning_with_line (pfile, CPP_BUF_LINE (buffer),
- CPP_BUF_COL (buffer),
- "embedded null character ignored");
- warned = 1;
+ {
+ cpp_warning (pfile, "null character(s) ignored");
+ warned = 1;
+ }
}
- else if (in_directive && CPP_PEDANTIC (pfile))
+ else if (IN_DIRECTIVE (pfile) && CPP_PEDANTIC (pfile))
cpp_pedwarn_with_line (pfile, CPP_BUF_LINE (buffer),
CPP_BUF_COL (buffer),
"%s in preprocessing directive",
c == '\f' ? "form feed" : "vertical tab");
- }
-}
-
-/* Parse (append) an identifier. Calculates the hash value of the
- token while parsing, for performance. The algorithm *must* match
- cpp_lookup(). */
-static const U_CHAR *
-parse_name (pfile, tok, cur, rlimit)
- cpp_reader *pfile;
- cpp_token *tok;
- const U_CHAR *cur, *rlimit;
-{
- const U_CHAR *name;
- unsigned int len;
- unsigned int r;
- name = cur;
- r = 0;
- while (cur < rlimit)
- {
- if (! is_idchar (*cur))
+ c = EOF;
+ if (buffer->cur == buffer->rlimit)
break;
- /* $ 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 (*cur == '$' && CPP_PEDANTIC (pfile) && ! pfile->skipping)
- {
- CPP_BUFFER (pfile)->cur = cur;
- cpp_pedwarn (pfile, "'$' character in identifier");
- }
-
- r = HASHSTEP (r, cur);
- cur++;
- }
- len = cur - name;
-
- if (tok->type == CPP_NAME && tok->val.node == 0)
- tok->val.node = _cpp_lookup_with_hash (pfile, name, len, r);
- else
- {
- unsigned int oldlen;
- U_CHAR *newname;
-
- if (tok->type == CPP_NAME)
- oldlen = tok->val.node->length;
- else
- oldlen = 1;
-
- newname = alloca (oldlen + len);
-
- if (tok->type == CPP_NAME)
- memcpy (newname, tok->val.node->name, oldlen);
- else
- newname[0] = tok->val.aux;
- memcpy (newname + oldlen, name, len);
- tok->val.node = cpp_lookup (pfile, newname, len + oldlen);
- tok->type = CPP_NAME;
+ c = *buffer->cur++;
}
+ /* We only want non-vertical space, i.e. ' ' \t \f \v \0. */
+ while (is_nvspace (c));
- return cur;
+ /* Remember the next character. */
+ buffer->read_ahead = c;
}
-/* Parse (append) a number. */
-static void
-parse_number (pfile, list, name)
+/* Parse an identifier, skipping embedded backslash-newlines.
+ Calculate the hash value of the token while parsing, for improved
+ performance. The hashing algorithm *must* match cpp_lookup(). */
+
+static cpp_hashnode *
+parse_identifier (pfile, c)
cpp_reader *pfile;
- cpp_toklist *list;
- cpp_string *name;
+ cppchar_t c;
{
- const unsigned char *name_limit;
- unsigned char *namebuf;
cpp_buffer *buffer = pfile->buffer;
- register const unsigned char *cur = buffer->cur;
-
- expanded:
- name_limit = list->namebuf + list->name_cap;
- namebuf = list->namebuf + list->name_used;
+ unsigned int r = 0, saw_dollar = 0;
+ unsigned int orig_used = pfile->token_list.name_used;
- for (; cur < buffer->rlimit && namebuf < name_limit; )
+ do
{
- unsigned char c = *namebuf = *cur; /* Copy a single char. */
+ do
+ {
+ if (pfile->token_list.name_used == pfile->token_list.name_cap)
+ _cpp_expand_name_space (&pfile->token_list,
+ pfile->token_list.name_used + 256);
+ pfile->token_list.namebuf[pfile->token_list.name_used++] = c;
+ r = HASHSTEP (r, c);
- /* Perhaps we should accept '$' here if we accept it for
- identifiers. We know namebuf[-1] is safe, because for c to
- be a sign we must have pushed at least one character. */
- if (!is_numchar (c) && c != '.' && ! VALID_SIGN (c, namebuf[-1]))
- goto out;
+ if (c == '$')
+ saw_dollar++;
- namebuf++;
- cur++;
- }
+ c = EOF;
+ if (buffer->cur == buffer->rlimit)
+ break;
- /* Run out of name space? */
- if (cur < buffer->rlimit)
- {
- list->name_used = namebuf - list->namebuf;
- auto_expand_name_space (list);
- goto expanded;
+ c = *buffer->cur++;
+ }
+ while (is_idchar (c));
+
+ /* Potential escaped newline? */
+ if (c != '?' && c != '\\')
+ break;
+ c = skip_escaped_newlines (buffer, c);
}
-
- out:
- buffer->cur = cur;
- name->len = namebuf - name->text;
- list->name_used = namebuf - list->namebuf;
-}
+ while (is_idchar (c));
-/* Places a string terminated by an unescaped TERMINATOR into a
- cpp_string, which should be expandable and thus at the top of the
- list's stack. Handles embedded trigraphs, if necessary, and
- escaped newlines.
+ /* $ 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->skipping)
+ cpp_pedwarn (pfile, "'$' character(s) in identifier");
- Can be used for character constants (terminator = '\''), string
- constants ('"') and angled headers ('>'). Multi-line strings are
- allowed, except for within directives. */
+ /* Remember the next character. */
+ buffer->read_ahead = c;
+ return _cpp_lookup_with_hash (pfile, &pfile->token_list.namebuf[orig_used],
+ pfile->token_list.name_used - orig_used, r);
+}
+/* Parse a number, skipping embedded backslash-newlines. */
static void
-parse_string (pfile, list, token, terminator)
+parse_number (pfile, number, c)
cpp_reader *pfile;
- cpp_toklist *list;
- cpp_token *token;
- unsigned int terminator;
+ cpp_string *number;
+ cppchar_t c;
{
+ cppchar_t prevc;
cpp_buffer *buffer = pfile->buffer;
- cpp_string *name = &token->val.str;
- register const unsigned char *cur = buffer->cur;
- const unsigned char *name_limit;
- unsigned char *namebuf;
- unsigned int null_count = 0;
- unsigned int trigraphed = list->name_used;
-
- expanded:
- name_limit = list->namebuf + list->name_cap;
- namebuf = list->namebuf + list->name_used;
-
- for (; cur < buffer->rlimit && namebuf < name_limit; )
- {
- unsigned int c = *namebuf++ = *cur++; /* Copy a single char. */
-
- if (c == '\0')
- null_count++;
- else if (c == terminator || is_vspace (c))
- {
- /* Needed for trigraph_replace and multiline string warning. */
- buffer->cur = cur;
-
- /* Scan for trigraphs before checking if backslash-escaped. */
- if ((CPP_OPTION (pfile, trigraphs)
- || CPP_OPTION (pfile, warn_trigraphs))
- && namebuf - (list->namebuf + trigraphed) >= 3)
- {
- namebuf = trigraph_replace (pfile, list->namebuf + trigraphed,
- namebuf);
- /* The test above guarantees trigraphed will be positive. */
- trigraphed = namebuf - list->namebuf - 2;
- }
-
- namebuf--; /* Drop the newline / terminator from the name. */
- if (is_vspace (c))
- {
- /* Drop a backslash newline, and continue. */
- U_CHAR *old = namebuf;
- while (namebuf > list->namebuf && is_hspace (namebuf[-1]))
- namebuf--;
- if (namebuf > list->namebuf && namebuf[-1] == '\\')
- {
- handle_newline (cur, buffer->rlimit, c);
- namebuf--;
- if (old[-1] != '\\')
- {
- buffer->cur = cur;
- cpp_warning (pfile,
- "backslash and newline separated by space");
- }
- continue;
- }
- else
- namebuf = old;
-
- cur--;
-
- /* In assembly language, silently terminate strings of
- either variety at end of line. This is a kludge
- around not knowing where comments are. */
- if (CPP_OPTION (pfile, lang_asm))
- goto out;
-
- /* Character constants and header names may not extend
- over multiple lines. In Standard C, neither may
- strings. We accept multiline strings as an
- extension. (Even in directives - otherwise, glibc's
- longlong.h breaks.) */
- if (terminator != '"')
- goto unterminated;
-
- cur++; /* Move forwards again. */
-
- if (pfile->multiline_string_line == 0)
- {
- pfile->multiline_string_line = token->line;
- pfile->multiline_string_column = token->col;
- if (CPP_PEDANTIC (pfile))
- cpp_pedwarn (pfile, "multi-line string constant");
- }
+ unsigned int orig_used = pfile->token_list.name_used;
- *namebuf++ = '\n';
- handle_newline (cur, buffer->rlimit, c);
- }
- else
- {
- unsigned char *temp;
+ /* Reserve space for a leading period. */
+ if (pfile->state.seen_dot)
+ pfile->token_list.name_used++;
- /* An odd number of consecutive backslashes represents
- an escaped terminator. */
- temp = namebuf - 1;
- while (temp >= name->text && *temp == '\\')
- temp--;
+ do
+ {
+ do
+ {
+ if (pfile->token_list.name_used >= pfile->token_list.name_cap)
+ _cpp_expand_name_space (&pfile->token_list,
+ pfile->token_list.name_used + 256);
+ pfile->token_list.namebuf[pfile->token_list.name_used++] = c;
+
+ prevc = c;
+ c = EOF;
+ if (buffer->cur == buffer->rlimit)
+ break;
- if ((namebuf - temp) & 1)
- goto out;
- namebuf++;
- }
+ c = *buffer->cur++;
}
- }
+ while (is_numchar (c) || c == '.' || VALID_SIGN (c, prevc));
- /* Run out of name space? */
- if (cur < buffer->rlimit)
- {
- list->name_used = namebuf - list->namebuf;
- auto_expand_name_space (list);
- goto expanded;
+ /* Potential escaped newline? */
+ if (c != '?' && c != '\\')
+ break;
+ c = skip_escaped_newlines (buffer, c);
}
+ while (is_numchar (c) || c == '.' || VALID_SIGN (c, prevc));
- /* We may not have trigraph-replaced the input for this code path,
- but as the input is in error by being unterminated we don't
- bother. Prevent warnings about no newlines at EOF. */
- if (is_vspace (cur[-1]))
- cur--;
-
- unterminated:
- cpp_error (pfile, "missing terminating %c character", (int) terminator);
+ /* Put any leading period in place, now we have the room. */
+ if (pfile->state.seen_dot)
+ pfile->token_list.namebuf[orig_used] = '.';
- if (terminator == '\"' && pfile->multiline_string_line != list->line
- && pfile->multiline_string_line != 0)
- {
- cpp_error_with_line (pfile, pfile->multiline_string_line,
- pfile->multiline_string_column,
- "possible start of unterminated string literal");
- pfile->multiline_string_line = 0;
- }
-
- out:
- buffer->cur = cur;
- name->len = namebuf - name->text;
- list->name_used = namebuf - list->namebuf;
+ /* Remember the next character. */
+ buffer->read_ahead = c;
- if (null_count > 0)
- cpp_warning (pfile, (null_count > 1 ? "null characters preserved"
- : "null character preserved"));
+ number->text = &pfile->token_list.namebuf[orig_used];
+ number->len = pfile->token_list.name_used - orig_used;
}
-/* The character TYPE helps us distinguish comment types: '*' = C
- style, '/' = C++ style. For code simplicity, the stored comment
- includes the comment start and any terminator. */
-
-#define COMMENT_START_LEN 2
+/* Subroutine of parse_string. Emits error for unterminated strings. */
static void
-save_comment (list, token, from, len, type)
- cpp_toklist *list;
- cpp_token *token;
- const unsigned char *from;
- unsigned int len;
- unsigned int type;
+unterminated (pfile, line, term)
+ cpp_reader *pfile;
+ unsigned int line;
+ int term;
{
- unsigned char *buffer;
-
- len += COMMENT_START_LEN;
-
- if (list->name_used + len > list->name_cap)
- _cpp_expand_name_space (list, len);
-
- INIT_TOKEN_STR (list, token);
- token->type = CPP_COMMENT;
- token->val.str.len = len;
-
- buffer = list->namebuf + list->name_used;
- list->name_used += len;
+ cpp_error (pfile, "missing terminating %c character", term);
- /* Copy the comment. */
- if (type == '*')
+ if (term == '\"' && pfile->mls_line && pfile->mls_line != line)
{
- *buffer++ = '/';
- *buffer++ = '*';
- }
- else
- {
- *buffer++ = type;
- *buffer++ = type;
+ cpp_error_with_line (pfile, pfile->mls_line, pfile->mls_column,
+ "possible start of unterminated string literal");
+ pfile->mls_line = 0;
}
- memcpy (buffer, from, len - COMMENT_START_LEN);
}
-/*
- * The tokenizer's main loop. Returns a token list, representing a
- * logical line in the input file. On EOF after some tokens have
- * been processed, we return immediately. Then in next call, or if
- * EOF occurred at the beginning of a logical line, a single CPP_EOF
- * token is placed in the list.
- *
- * Implementation relies almost entirely on lookback, rather than
- * looking forwards. This means that tokenization requires just
- * a single pass of the file, even in the presence of trigraphs and
- * escaped newlines, providing significant performance benefits.
- * Trigraph overhead is negligible if they are disabled, and low
- * even when enabled.
- */
-
-#define KNOWN_DIRECTIVE() (list->directive != 0)
-#define MIGHT_BE_DIRECTIVE() \
-(cur_token == &list->tokens[first_token + 1] && cur_token[-1].type == CPP_HASH)
+/* Parses a string, character constant, or angle-bracketed header file
+ name. Handles embedded trigraphs and escaped newlines.
+ Multi-line strings are allowed, but they are deprecated within
+ directives. */
static void
-lex_line (pfile, list)
+parse_string (pfile, token, terminator)
cpp_reader *pfile;
- cpp_toklist *list;
+ cpp_token *token;
+ cppchar_t terminator;
{
- cpp_token *cur_token, *token_limit, *first;
cpp_buffer *buffer = pfile->buffer;
- const unsigned char *cur = buffer->cur;
- unsigned char flags = 0;
- unsigned int first_token = list->tokens_used;
+ unsigned int orig_used = pfile->token_list.name_used;
+ cppchar_t c;
+ unsigned int nulls = 0;
- if (!(list->flags & LIST_OFFSET))
- (abort) ();
-
- retry:
- list->file = buffer->nominal_fname;
- list->line = CPP_BUF_LINE (buffer);
- pfile->col_adjust = 0;
- pfile->in_lex_line = 1;
- if (cur == buffer->buf)
- list->flags |= BEG_OF_FILE;
-
- expanded:
- token_limit = list->tokens + list->tokens_cap;
- cur_token = list->tokens + list->tokens_used;
-
- for (; cur < buffer->rlimit && cur_token < token_limit;)
+ for (;;)
{
- unsigned char c;
-
- /* Optimize non-vertical whitespace skipping; most tokens are
- probably separated by whitespace. (' ' '\t' '\v' '\f' '\0'). */
- c = *cur;
- if (is_nvspace (c))
+ if (buffer->cur == buffer->rlimit)
{
- buffer->cur = cur;
- skip_whitespace (pfile, (list->tokens[first_token].type == CPP_HASH
- && cur_token > &list->tokens[first_token]));
- cur = buffer->cur;
-
- flags = PREV_WHITE;
- if (cur == buffer->rlimit)
- break;
- c = *cur;
+ c = EOF;
+ unterminated (pfile, token->line, terminator);
+ break;
}
- cur++;
+ c = *buffer->cur++;
- /* Initialize current token. CPP_EOF will not be fixed up by
- expand_name_space. */
- list->tokens_used = cur_token - list->tokens + 1;
- cur_token->type = CPP_EOF;
- cur_token->col = CPP_BUF_COLUMN (buffer, cur);
- cur_token->line = CPP_BUF_LINE (buffer);
- cur_token->flags = flags;
- flags = 0;
+ have_char:
+ /* Handle trigraphs, escaped newlines etc. */
+ if (c == '?' || c == '\\')
+ c = skip_escaped_newlines (buffer, c);
- switch (c)
+ if (c == terminator)
{
- case '0': case '1': case '2': case '3': case '4':
- case '5': case '6': case '7': case '8': case '9':
- {
- int prev_dot;
-
- cur--; /* Backup character. */
- prev_dot = PREV_TOKEN_TYPE == CPP_DOT && IMMED_TOKEN ();
- if (prev_dot)
- cur_token--;
- INIT_TOKEN_STR (list, cur_token);
- /* Prepend an immediately previous CPP_DOT token. */
- if (prev_dot)
- {
- if (list->name_cap == list->name_used)
- auto_expand_name_space (list);
-
- cur_token->val.str.len = 1;
- list->namebuf[list->name_used++] = '.';
- }
-
- continue_number:
- cur_token->type = CPP_NUMBER; /* Before parse_number. */
- buffer->cur = cur;
- parse_number (pfile, list, &cur_token->val.str);
- cur = buffer->cur;
- }
- /* Check for # 123 form of #line. */
- if (MIGHT_BE_DIRECTIVE ())
- list->directive = _cpp_check_linemarker (pfile, cur_token,
- !(cur_token[-1].flags
- & PREV_WHITE));
- cur_token++;
- break;
-
- letter:
- case '_':
- case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
- case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
- case 'm': case 'n': case 'o': case 'p': case 'q': case 'r':
- case 's': case 't': case 'u': case 'v': case 'w': case 'x':
- case 'y': case 'z':
- case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
- case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
- case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
- case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
- case 'Y': case 'Z':
- cur--; /* Backup character. */
-
- /* In Objective C, '@' may begin certain keywords. */
- if (CPP_OPTION (pfile, objc) && cur_token[-1].type == CPP_OTHER
- && cur_token[-1].val.aux == '@' && IMMED_TOKEN ())
- cur_token--;
- else
- {
- cur_token->val.node = 0;
- cur_token->type = CPP_NAME; /* Identifier, macro etc. */
- }
-
- continue_name:
- cur = parse_name (pfile, cur_token, cur, buffer->rlimit);
-
- if (MIGHT_BE_DIRECTIVE ())
- list->directive = _cpp_check_directive (pfile, cur_token,
- !(list->tokens[0].flags
- & PREV_WHITE));
- /* Convert named operators to their proper types. */
- if (cur_token->val.node->type == T_OPERATOR)
- {
- cur_token->flags |= NAMED_OP;
- cur_token->type = cur_token->val.node->value.code;
- }
-
- cur_token++;
- break;
+ unsigned int u = pfile->token_list.name_used;
- case '\'':
- cur_token->type = CPP_CHAR;
- if (cur_token[-1].type == CPP_NAME && IMMED_TOKEN ()
- && cur_token[-1].val.node == pfile->spec_nodes->n_L)
- BACKUP_TOKEN (CPP_WCHAR);
- goto do_parse_string;
-
- case '\"':
- cur_token->type = CPP_STRING;
- if (cur_token[-1].type == CPP_NAME && IMMED_TOKEN ()
- && cur_token[-1].val.node == pfile->spec_nodes->n_L)
- BACKUP_TOKEN (CPP_WSTRING);
- else if (CPP_OPTION (pfile, objc)
- && cur_token[-1].type == CPP_OTHER && IMMED_TOKEN ()
- && cur_token[-1].val.aux == '@')
- BACKUP_TOKEN (CPP_OSTRING);
-
- do_parse_string:
- /* Here c is one of ' " or >. */
- INIT_TOKEN_STR (list, cur_token);
- buffer->cur = cur;
- parse_string (pfile, list, cur_token, c);
- cur = buffer->cur;
- cur_token++;
- break;
+ /* An odd number of consecutive backslashes represents an
+ escaped terminator. */
+ while (u > orig_used && pfile->token_list.namebuf[u - 1] == '\\')
+ u--;
- case '/':
- cur_token->type = CPP_DIV;
- if (IMMED_TOKEN ())
+ if ((pfile->token_list.name_used - u) % 2 == 0)
{
- if (PREV_TOKEN_TYPE == CPP_DIV)
- {
- /* We silently allow C++ comments in system headers,
- irrespective of conformance mode, because lots of
- broken systems do that and trying to clean it up
- in fixincludes is a nightmare. */
- if (CPP_IN_SYSTEM_HEADER (pfile))
- goto do_line_comment;
- else if (CPP_OPTION (pfile, cplusplus_comments))
- {
- if (CPP_OPTION (pfile, c89) && CPP_PEDANTIC (pfile)
- && ! buffer->warned_cplusplus_comments)
- {
- buffer->cur = cur;
- cpp_pedwarn (pfile,
- "C++ style comments are not allowed in ISO C89");
- cpp_pedwarn (pfile,
- "(this will be reported only once per input file)");
- buffer->warned_cplusplus_comments = 1;
- }
- do_line_comment:
- buffer->cur = cur;
-#if 0 /* Leave until new lexer in place. */
- if (cur[-2] != c)
- cpp_warning (pfile,
- "comment start split across lines");
-#endif
- if (skip_line_comment (pfile))
- cpp_warning (pfile, "multi-line comment");
-
- /* Back-up to first '-' or '/'. */
- cur_token--;
- if (!CPP_OPTION (pfile, discard_comments)
- && (!KNOWN_DIRECTIVE()
- || (list->directive->flags & COMMENTS)))
- save_comment (list, cur_token++, cur,
- buffer->cur - cur, c);
- else
- flags = PREV_WHITE;
-
- cur = buffer->cur;
- break;
- }
- }
- }
- cur_token++;
- break;
-
- case '*':
- cur_token->type = CPP_MULT;
- if (IMMED_TOKEN ())
- {
- if (PREV_TOKEN_TYPE == CPP_DIV)
- {
- buffer->cur = cur;
-#if 0 /* Leave until new lexer in place. */
- if (cur[-2] != '/')
- cpp_warning (pfile,
- "comment start '/*' split across lines");
-#endif
- if (skip_block_comment (pfile))
- cpp_error_with_line (pfile, list->line, cur_token[-1].col,
- "unterminated comment");
-#if 0 /* Leave until new lexer in place. */
- else if (buffer->cur[-2] != '*')
- cpp_warning (pfile,
- "comment end '*/' split across lines");
-#endif
- /* Back up to opening '/'. */
- cur_token--;
- if (!CPP_OPTION (pfile, discard_comments)
- && (!KNOWN_DIRECTIVE()
- || (list->directive->flags & COMMENTS)))
- save_comment (list, cur_token++, cur,
- buffer->cur - cur, c);
- else
- flags = PREV_WHITE;
-
- cur = buffer->cur;
- break;
- }
- else if (CPP_OPTION (pfile, cplusplus))
- {
- /* In C++, there are .* and ->* operators. */
- if (PREV_TOKEN_TYPE == CPP_DEREF)
- BACKUP_TOKEN (CPP_DEREF_STAR);
- else if (PREV_TOKEN_TYPE == CPP_DOT)
- BACKUP_TOKEN (CPP_DOT_STAR);
- }
+ c = EOF;
+ break;
}
- cur_token++;
- 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_asm) && terminator != '>')
+ break;
- case '\n':
- case '\r':
- handle_newline (cur, buffer->rlimit, c);
- if (PREV_TOKEN_TYPE == CPP_BACKSLASH)
+ /* 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. (Deprecatedly even in directives - otherwise,
+ glibc's longlong.h breaks.) */
+ if (terminator != '"')
{
- /* backslash space newline is still treated as backslash-newline;
- we think this is standard conforming, with some reservations
- about actually _using_ the weasel words in C99 5.1.1.2
- (translation phase 1 is allowed to do whatever it wants to
- your input as long as it's documented). */
- if (! IMMED_TOKEN ())
- {
- buffer->cur = cur;
- cpp_warning (pfile,
- "backslash and newline separated by space");
- }
-
- /* Remove the escaped newline. Then continue to process
- any interrupted name or number. */
- cur_token--;
- /* Backslash-newline may not be immediately followed by
- EOF (C99 5.1.1.2). */
- if (cur >= buffer->rlimit)
- {
- cpp_pedwarn (pfile, "backslash-newline at end of file");
- break;
- }
- if (IMMED_TOKEN ())
- {
- cur_token--;
- if (cur_token->type == CPP_NAME)
- goto continue_name;
- else if (cur_token->type == CPP_NUMBER)
- goto continue_number;
- cur_token++;
- }
- /* Remember whitespace setting. */
- flags = cur_token->flags;
+ unterminated (pfile, token->line, terminator);
break;
}
- else if (MIGHT_BE_DIRECTIVE ())
+
+ if (pfile->mls_line == 0)
{
- /* "Null directive." C99 6.10.7: A preprocessing
- directive of the form # <new-line> has no effect.
-
- But it is still a directive, and therefore disappears
- from the output. */
- cur_token--;
- if (cur_token->flags & PREV_WHITE
- && CPP_WTRADITIONAL (pfile))
- cpp_warning (pfile, "K+R C ignores #\\n with the # indented");
+ pfile->mls_line = token->line;
+ pfile->mls_column = token->col;
+ if (CPP_PEDANTIC (pfile))
+ cpp_pedwarn (pfile, "multi-line string constant");
}
+
+ handle_newline (buffer, c); /* Stores to read_ahead. */
+ c = '\n';
+ }
+ else if (c == '\0')
+ {
+ if (nulls++ == 0)
+ cpp_warning (pfile, "null character(s) preserved in literal");
+ }
- /* Skip vertical space until we have at least one token to
- return. */
- if (cur_token != &list->tokens[first_token])
- goto out;
- list->line = CPP_BUF_LINE (buffer);
- break;
+ if (pfile->token_list.name_used == pfile->token_list.name_cap)
+ _cpp_expand_name_space (&pfile->token_list,
+ pfile->token_list.name_used + 256);
- case '-':
- if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_MINUS)
- REVISE_TOKEN (CPP_MINUS_MINUS);
- else
- PUSH_TOKEN (CPP_MINUS);
- break;
+ pfile->token_list.namebuf[pfile->token_list.name_used++] = c;
+ /* If we had a new line, the next character is in read_ahead. */
+ if (c != '\n')
+ continue;
+ c = buffer->read_ahead;
+ if (c != EOF)
+ goto have_char;
+ }
- make_hash:
- case '#':
- /* The digraph flag checking ensures that ## and %:%:
- are interpreted as CPP_PASTE, but #%: and %:# are not. */
- if (PREV_TOKEN_TYPE == CPP_HASH && IMMED_TOKEN ()
- && ((cur_token->flags ^ cur_token[-1].flags) & DIGRAPH) == 0)
- REVISE_TOKEN (CPP_PASTE);
- else
- PUSH_TOKEN (CPP_HASH);
- break;
+ buffer->read_ahead = c;
- case ':':
- cur_token->type = CPP_COLON;
- if (IMMED_TOKEN ())
- {
- if (PREV_TOKEN_TYPE == CPP_COLON
- && CPP_OPTION (pfile, cplusplus))
- BACKUP_TOKEN (CPP_SCOPE);
- else if (CPP_OPTION (pfile, digraphs))
- {
- /* Digraph: "<:" is a '[' */
- if (PREV_TOKEN_TYPE == CPP_LESS)
- BACKUP_DIGRAPH (CPP_OPEN_SQUARE);
- /* Digraph: "%:" is a '#' */
- else if (PREV_TOKEN_TYPE == CPP_MOD)
- {
- (--cur_token)->flags |= DIGRAPH;
- goto make_hash;
- }
- }
- }
- cur_token++;
- break;
+ token->val.str.text = &pfile->token_list.namebuf[orig_used];
+ token->val.str.len = pfile->token_list.name_used - orig_used;
+}
- case '&':
- if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_AND)
- REVISE_TOKEN (CPP_AND_AND);
- else
- PUSH_TOKEN (CPP_AND);
- break;
+/* For output routine simplicity, 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;
+{
+ unsigned char *buffer;
+ unsigned int len;
+ cpp_toklist *list = &pfile->token_list;
+
+ len = pfile->buffer->cur - from + 1; /* + 1 for the initial '/'. */
+ _cpp_reserve_name_space (list, len);
+ buffer = list->namebuf + list->name_used;
+ list->name_used += len;
+
+ token->type = CPP_COMMENT;
+ token->val.str.len = len;
+ token->val.str.text = buffer;
- make_or:
- case '|':
- if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_OR)
- REVISE_TOKEN (CPP_OR_OR);
- else
- PUSH_TOKEN (CPP_OR);
- break;
+ buffer[0] = '/';
+ memcpy (buffer + 1, from, len - 1);
+}
- case '+':
- if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_PLUS)
- REVISE_TOKEN (CPP_PLUS_PLUS);
- else
- PUSH_TOKEN (CPP_PLUS);
- break;
+/* Subroutine of lex_token to handle '%'. A little tricky, since we
+ want to avoid stepping back when lexing %:%X. */
+static void
+lex_percent (buffer, result)
+ cpp_buffer *buffer;
+ cpp_token *result;
+{
+ cppchar_t c;
- case '=':
- /* This relies on equidistance of "?=" and "?" tokens. */
- if (IMMED_TOKEN () && PREV_TOKEN_TYPE <= CPP_LAST_EQ)
- REVISE_TOKEN (PREV_TOKEN_TYPE + (CPP_EQ_EQ - CPP_EQ));
- else
- PUSH_TOKEN (CPP_EQ);
- break;
+ result->type = CPP_MOD;
+ /* Parsing %:%X could leave an extra character. */
+ if (buffer->extra_char == EOF)
+ c = get_effective_char (buffer);
+ else
+ {
+ c = buffer->read_ahead = buffer->extra_char;
+ buffer->extra_char = EOF;
+ }
- case '>':
- cur_token->type = CPP_GREATER;
- if (IMMED_TOKEN ())
+ if (c == '=')
+ ACCEPT_CHAR (CPP_MOD_EQ);
+ else if (CPP_OPTION (buffer->pfile, digraphs))
+ {
+ if (c == ':')
+ {
+ result->flags |= DIGRAPH;
+ ACCEPT_CHAR (CPP_HASH);
+ if (get_effective_char (buffer) == '%')
{
- if (PREV_TOKEN_TYPE == CPP_GREATER)
- BACKUP_TOKEN (CPP_RSHIFT);
- else if (PREV_TOKEN_TYPE == CPP_MINUS)
- BACKUP_TOKEN (CPP_DEREF);
- else if (CPP_OPTION (pfile, digraphs))
+ buffer->extra_char = get_effective_char (buffer);
+ if (buffer->extra_char == ':')
{
- /* Digraph: ":>" is a ']' */
- if (PREV_TOKEN_TYPE == CPP_COLON)
- BACKUP_DIGRAPH (CPP_CLOSE_SQUARE);
- /* Digraph: "%>" is a '}' */
- else if (PREV_TOKEN_TYPE == CPP_MOD)
- BACKUP_DIGRAPH (CPP_CLOSE_BRACE);
+ buffer->extra_char = EOF;
+ ACCEPT_CHAR (CPP_PASTE);
}
+ else
+ /* We'll catch the extra_char when we're called back. */
+ buffer->read_ahead = '%';
}
- cur_token++;
- break;
-
- case '<':
- if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_LESS)
- {
- REVISE_TOKEN (CPP_LSHIFT);
- break;
- }
- /* Is this the beginning of a header name? */
- if (KNOWN_DIRECTIVE () && (list->directive->flags & INCL))
- {
- c = '>'; /* Terminator. */
- cur_token->type = CPP_HEADER_NAME;
- goto do_parse_string;
- }
- PUSH_TOKEN (CPP_LESS);
- break;
+ }
+ else if (c == '>')
+ {
+ result->flags |= DIGRAPH;
+ ACCEPT_CHAR (CPP_CLOSE_BRACE);
+ }
+ }
+}
- case '%':
- /* Digraph: "<%" is a '{' */
- cur_token->type = CPP_MOD;
- if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_LESS
- && CPP_OPTION (pfile, digraphs))
- BACKUP_DIGRAPH (CPP_OPEN_BRACE);
- cur_token++;
- break;
+/* Subroutine of lex_token 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;
- case '?':
- if (cur + 1 < buffer->rlimit && *cur == '?'
- && _cpp_trigraph_map[cur[1]] && trigraph_ok (pfile, cur + 1))
- {
- /* Handle trigraph. */
- cur++;
- switch (*cur++)
- {
- case '(': goto make_open_square;
- case ')': goto make_close_square;
- case '<': goto make_open_brace;
- case '>': goto make_close_brace;
- case '=': goto make_hash;
- case '!': goto make_or;
- case '-': goto make_complement;
- case '/': goto make_backslash;
- case '\'': goto make_xor;
- }
- }
- if (IMMED_TOKEN () && CPP_OPTION (pfile, cplusplus))
- {
- /* GNU C++ defines <? and >? operators. */
- if (PREV_TOKEN_TYPE == CPP_LESS)
- {
- REVISE_TOKEN (CPP_MIN);
- break;
- }
- else if (PREV_TOKEN_TYPE == CPP_GREATER)
- {
- REVISE_TOKEN (CPP_MAX);
- break;
- }
- }
- PUSH_TOKEN (CPP_QUERY);
- break;
+ /* Parsing ..X could leave an extra character. */
+ if (buffer->extra_char == EOF)
+ c = get_effective_char (buffer);
+ else
+ {
+ c = buffer->read_ahead = buffer->extra_char;
+ buffer->extra_char = EOF;
+ }
- case '.':
- if (PREV_TOKEN_TYPE == CPP_DOT && cur_token[-2].type == CPP_DOT
- && IMMED_TOKEN ()
- && !(cur_token[-1].flags & PREV_WHITE))
+ /* All known character sets have 0...9 contiguous. */
+ if (c >= '0' && c <= '9')
+ {
+ result->type = CPP_NUMBER;
+ buffer->pfile->state.seen_dot = 1;
+ parse_number (pfile, &result->val.str, c);
+ buffer->pfile->state.seen_dot = 0;
+ }
+ else
+ {
+ result->type = CPP_DOT;
+ if (c == '.')
+ {
+ buffer->extra_char = get_effective_char (buffer);
+ if (buffer->extra_char == '.')
{
- cur_token -= 2;
- PUSH_TOKEN (CPP_ELLIPSIS);
+ buffer->extra_char = EOF;
+ ACCEPT_CHAR (CPP_ELLIPSIS);
}
else
- PUSH_TOKEN (CPP_DOT);
- break;
-
- make_complement:
- case '~': PUSH_TOKEN (CPP_COMPL); break;
- make_xor:
- case '^': PUSH_TOKEN (CPP_XOR); break;
- make_open_brace:
- case '{': PUSH_TOKEN (CPP_OPEN_BRACE); break;
- make_close_brace:
- case '}': PUSH_TOKEN (CPP_CLOSE_BRACE); break;
- make_open_square:
- case '[': PUSH_TOKEN (CPP_OPEN_SQUARE); break;
- make_close_square:
- case ']': PUSH_TOKEN (CPP_CLOSE_SQUARE); break;
- make_backslash:
- case '\\': PUSH_TOKEN (CPP_BACKSLASH); break;
- case '!': PUSH_TOKEN (CPP_NOT); break;
- case ',': PUSH_TOKEN (CPP_COMMA); break;
- case ';': PUSH_TOKEN (CPP_SEMICOLON); break;
- case '(': PUSH_TOKEN (CPP_OPEN_PAREN); break;
- case ')': PUSH_TOKEN (CPP_CLOSE_PAREN); break;
-
- case '$':
- if (CPP_OPTION (pfile, dollars_in_ident))
- goto letter;
- /* Fall through */
- default:
- cur_token->val.aux = c;
- PUSH_TOKEN (CPP_OTHER);
- break;
+ /* 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);
}
+}
+
+static void
+lex_token (pfile, result)
+ cpp_reader *pfile;
+ cpp_token *result;
+{
+ cppchar_t c;
+ cpp_buffer *buffer = pfile->buffer;
+ const unsigned char *comment_start;
+
+ result->flags = 0;
+ next_char:
+ result->line = CPP_BUF_LINE (buffer);
+ next_char2:
+ result->col = CPP_BUF_COLUMN (buffer, buffer->cur);
- /* Run out of token space? */
- if (cur_token == token_limit)
+ c = buffer->read_ahead;
+ if (c == EOF && buffer->cur < buffer->rlimit)
{
- list->tokens_used = cur_token - list->tokens;
- _cpp_expand_token_space (list, 256);
- goto expanded;
+ c = *buffer->cur++;
+ result->col++;
}
- cur_token->flags = flags;
- if (cur_token == &list->tokens[first_token] && pfile->done_initializing)
+ do_switch:
+ buffer->read_ahead = EOF;
+ switch (c)
{
- if (cur > buffer->buf && !is_vspace (cur[-1]))
- cpp_pedwarn_with_line (pfile, CPP_BUF_LINE (buffer),
- CPP_BUF_COLUMN (buffer, cur),
+ case EOF:
+ /* Non-empty files should end in a newline. Testing
+ skip_newlines ensures we only emit the warning once. */
+ if (buffer->cur != buffer->line_base && buffer->cur != buffer->buf
+ && pfile->state.skip_newlines)
+ cpp_pedwarn_with_line (pfile, buffer->lineno, CPP_BUF_COL (buffer),
"no newline at end of file");
- cur_token++->type = CPP_EOF;
- }
+ result->type = CPP_EOF;
+ break;
- out:
- /* All tokens are allocated, so the memory location is fixed. */
- first = &list->tokens[first_token];
+ case ' ': case '\t': case '\f': case '\v': case '\0':
+ skip_whitespace (pfile, c);
+ result->flags |= PREV_WHITE;
+ goto next_char2;
+
+ case '\n': case '\r':
+ result->type = CPP_EOF;
+ handle_newline (buffer, c);
+ /* Handling here will change significantly when moving to
+ token-at-a-time. */
+ if (pfile->state.skip_newlines)
+ {
+ result->flags &= ~PREV_WHITE; /* Clear any whitespace flag. */
+ goto next_char;
+ }
+ break;
- /* Don't complain about the null directive, nor directives in
- assembly source: we don't know where the comments are, and # may
- introduce assembler pseudo-ops. Don't complain about invalid
- directives in skipped conditional groups (6.10 p4). */
- if (first->type == CPP_HASH && list->directive == 0 && !pfile->skipping
- && cur_token > first + 1 && !CPP_OPTION (pfile, lang_asm))
- {
- if (first[1].type == CPP_NAME)
- cpp_error (pfile, "invalid preprocessing directive #%s",
- first[1].val.node->name);
- else
- cpp_error (pfile, "invalid preprocessing directive");
+ case '?':
+ case '\\':
+ /* These could start an escaped newline, or '?' a trigraph. Let
+ skip_escaped_newlines do all the work. */
+ {
+ unsigned int lineno = buffer->lineno;
+
+ c = skip_escaped_newlines (buffer, c);
+ if (lineno != buffer->lineno)
+ /* 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 next_char;
+
+ /* We are either the original '?' or '\\', or a trigraph. */
+ result->type = CPP_QUERY;
+ buffer->read_ahead = EOF;
+ if (c == '\\')
+ result->type = CPP_BACKSLASH;
+ else if (c != '?')
+ goto do_switch;
+ }
+ break;
- /* Discard this line to prevent further errors from cc1. */
- _cpp_clear_toklist (list);
- goto retry;
- }
+ 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);
+ break;
- /* Put EOF at end of known directives. This covers "directives do
- not extend beyond the end of the line (description 6.10 part 2)". */
- if (KNOWN_DIRECTIVE () || !pfile->done_initializing)
- {
- pfile->first_directive_token = first;
- cur_token++->type = CPP_EOF;
- }
+ case '$':
+ if (!CPP_OPTION (pfile, dollars_in_ident))
+ goto random_char;
+ /* Fall through... */
+
+ case '_':
+ case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
+ case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
+ case 'm': case 'n': case 'o': case 'p': case 'q': case 'r':
+ case 's': case 't': case 'u': case 'v': case 'w': case 'x':
+ case 'y': case 'z':
+ case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
+ case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
+ case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
+ case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
+ case 'Y': case 'Z':
+ result->type = CPP_NAME;
+ result->val.node = parse_identifier (pfile, c);
+
+ /* 'L' may introduce wide characters or strings. */
+ if (result->val.node == pfile->spec_nodes->n_L)
+ {
+ c = buffer->read_ahead; /* For make_string. */
+ if (c == '\'' || c == '"')
+ {
+ ACCEPT_CHAR (c == '"' ? CPP_WSTRING: CPP_WCHAR);
+ goto make_string;
+ }
+ }
+ /* Convert named operators to their proper types. */
+ else if (result->val.node->type == T_OPERATOR)
+ {
+ result->flags |= NAMED_OP;
+ result->type = result->val.node->value.code;
+ }
+ break;
- first->flags |= BOL;
- if (first_token != 0)
- /* 6.10.3.10: Within the sequence of preprocessing tokens making
- up the invocation of a function-like macro, new line is
- considered a normal white-space character. */
- first->flags |= PREV_WHITE;
-
- buffer->cur = cur;
- list->tokens_used = cur_token - list->tokens;
- pfile->in_lex_line = 0;
-}
+ case '\'':
+ case '"':
+ result->type = c == '"' ? CPP_STRING: CPP_CHAR;
+ make_string:
+ parse_string (pfile, result, c);
+ break;
-/* Write the spelling of a token TOKEN, with any appropriate
- whitespace before it, to FP. PREV is the previous token, which
- is used to determine if we need to shove in an extra space in order
- to avoid accidental token paste. If WHITE is 0, do not insert any
- leading whitespace. */
-static void
-output_token (pfile, fp, token, prev, white)
- cpp_reader *pfile;
- FILE *fp;
- const cpp_token *token, *prev;
- int white;
-{
- if (white)
- {
- int dummy;
+ case '/':
+ /* A potential block or line comment. */
+ comment_start = buffer->cur;
+ result->type = CPP_DIV;
+ c = get_effective_char (buffer);
+ if (c == '=')
+ ACCEPT_CHAR (CPP_DIV_EQ);
+ if (c != '/' && c != '*')
+ break;
- if (token->col && (token->flags & BOL))
+ if (c == '*')
{
- /* Supply enough whitespace to put this token in its original
- column. Don't bother trying to reconstruct tabs; we can't
- get it right in general, and nothing ought to care. (Yes,
- some things do care; the fault lies with them.) */
- unsigned int spaces = token->col - 1;
-
- while (spaces--)
- putc (' ', fp);
+ if (skip_block_comment (pfile))
+ cpp_error_with_line (pfile, result->line, result->col,
+ "unterminated comment");
}
- else if (token->flags & PREV_WHITE)
- putc (' ', fp);
else
- /* Check for and prevent accidental token pasting.
- In addition to the cases handled by can_paste, consider
-
- a + ++b - if there is not a space between the + and ++, it
- will be misparsed as a++ + b. But + ## ++ doesn't produce
- a valid token. */
- if (prev
- && (can_paste (pfile, prev, token, &dummy) != CPP_EOF
- || (prev->type == CPP_PLUS && token->type == CPP_PLUS_PLUS)
- || (prev->type == CPP_MINUS && token->type == CPP_MINUS_MINUS)))
- putc (' ', fp);
- }
+ {
+ if (!CPP_OPTION (pfile, cplusplus_comments)
+ && !CPP_IN_SYSTEM_HEADER (pfile))
+ break;
- switch (TOKEN_SPELL (token))
- {
- case SPELL_OPERATOR:
- {
- const unsigned char *spelling;
+ /* We silently allow C++ comments in system headers,
+ irrespective of conformance mode, because lots of
+ broken systems do that and trying to clean it up in
+ fixincludes is a nightmare. */
+ if (CPP_OPTION (pfile, c89) && 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)");
+ buffer->warned_cplusplus_comments = 1;
+ }
- if (token->flags & DIGRAPH)
- spelling = digraph_spellings[token->type - CPP_FIRST_DIGRAPH];
- else if (token->flags & NAMED_OP)
- goto spell_ident;
- else
- spelling = TOKEN_NAME (token);
+ /* Skip_line_comment updates buffer->read_ahead. */
+ if (skip_line_comment (pfile))
+ cpp_warning_with_line (pfile, result->line, result->col,
+ "multi-line comment");
+ }
- ufputs (spelling, fp);
- }
+ /* Skipping the comment has updated buffer->read_ahead. */
+ if (!pfile->state.save_comments)
+ {
+ result->flags |= PREV_WHITE;
+ goto next_char;
+ }
+
+ /* Save the comment as a token in its own right. */
+ save_comment (pfile, result, comment_start);
break;
- case SPELL_IDENT:
- spell_ident:
- ufputs (token->val.node->name, fp);
+ case '<':
+ if (pfile->state.angled_headers)
+ {
+ result->type = CPP_HEADER_NAME;
+ c = '>'; /* terminator. */
+ goto make_string;
+ }
+
+ result->type = CPP_LESS;
+ c = get_effective_char (buffer);
+ if (c == '=')
+ ACCEPT_CHAR (CPP_LESS_EQ);
+ else if (c == '<')
+ {
+ ACCEPT_CHAR (CPP_LSHIFT);
+ if (get_effective_char (buffer) == '=')
+ ACCEPT_CHAR (CPP_LSHIFT_EQ);
+ }
+ else if (c == '?' && CPP_OPTION (pfile, cplusplus))
+ {
+ ACCEPT_CHAR (CPP_MIN);
+ if (get_effective_char (buffer) == '=')
+ ACCEPT_CHAR (CPP_MIN_EQ);
+ }
+ else if (c == ':' && 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;
+ }
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_OSTRING: left = '"'; right = '"'; tag = '@'; 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);
- }
+ case '>':
+ result->type = CPP_GREATER;
+ c = get_effective_char (buffer);
+ if (c == '=')
+ ACCEPT_CHAR (CPP_GREATER_EQ);
+ else if (c == '>')
+ {
+ ACCEPT_CHAR (CPP_RSHIFT);
+ if (get_effective_char (buffer) == '=')
+ ACCEPT_CHAR (CPP_RSHIFT_EQ);
+ }
+ else if (c == '?' && CPP_OPTION (pfile, cplusplus))
+ {
+ ACCEPT_CHAR (CPP_MAX);
+ if (get_effective_char (buffer) == '=')
+ ACCEPT_CHAR (CPP_MAX_EQ);
+ }
break;
- case SPELL_CHAR:
- putc (token->val.aux, fp);
+ case '%':
+ lex_percent (buffer, result);
break;
- case SPELL_NONE:
- /* Placemarker or EOF - no output. (Macro args are handled
- elsewhere. */
+ case '.':
+ lex_dot (pfile, result);
+ break;
+
+ case '+':
+ result->type = CPP_PLUS;
+ c = get_effective_char (buffer);
+ if (c == '=')
+ ACCEPT_CHAR (CPP_PLUS_EQ);
+ else if (c == '+')
+ ACCEPT_CHAR (CPP_PLUS_PLUS);
+ break;
+
+ case '-':
+ result->type = CPP_MINUS;
+ c = get_effective_char (buffer);
+ if (c == '>')
+ {
+ ACCEPT_CHAR (CPP_DEREF);
+ if (CPP_OPTION (pfile, cplusplus)
+ && get_effective_char (buffer) == '*')
+ ACCEPT_CHAR (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 (buffer) == '=')
+ ACCEPT_CHAR (CPP_MULT_EQ);
+ break;
+
+ case '=':
+ result->type = CPP_EQ;
+ if (get_effective_char (buffer) == '=')
+ ACCEPT_CHAR (CPP_EQ_EQ);
+ break;
+
+ case '!':
+ result->type = CPP_NOT;
+ if (get_effective_char (buffer) == '=')
+ ACCEPT_CHAR (CPP_NOT_EQ);
+ break;
+
+ case '&':
+ result->type = CPP_AND;
+ c = get_effective_char (buffer);
+ 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 (buffer) == '#')
+ ACCEPT_CHAR (CPP_PASTE);
+ break;
+
+ case '|':
+ result->type = CPP_OR;
+ c = get_effective_char (buffer);
+ 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 (buffer) == '=')
+ ACCEPT_CHAR (CPP_XOR_EQ);
+ break;
+
+ case ':':
+ result->type = CPP_COLON;
+ c = get_effective_char (buffer);
+ if (c == ':' && CPP_OPTION (pfile, cplusplus))
+ ACCEPT_CHAR (CPP_SCOPE);
+ else if (c == '>' && CPP_OPTION (pfile, digraphs))
+ {
+ result->flags |= DIGRAPH;
+ ACCEPT_CHAR (CPP_CLOSE_SQUARE);
+ }
+ 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;
+
+ case '@':
+ if (CPP_OPTION (pfile, objc))
+ {
+ /* In Objective C, '@' may begin keywords or strings, like
+ @keyword or @"string". It would be nice to call
+ get_effective_char here and test the result. However, we
+ would then need to pass 2 characters to parse_identifier,
+ making it ugly and slowing down its main loop. Instead,
+ we assume we have an identifier, and recover if not. */
+ result->type = CPP_NAME;
+ result->val.node = parse_identifier (pfile, c);
+ if (result->val.node->length != 1)
+ break;
+
+ /* OK, so it wasn't an identifier. Maybe a string? */
+ if (buffer->read_ahead == '"')
+ {
+ c = '"';
+ ACCEPT_CHAR (CPP_OSTRING);
+ goto make_string;
+ }
+ }
+ goto random_char;
+
+ random_char:
+ default:
+ result->type = CPP_OTHER;
+ result->val.aux = c;
break;
}
}
-/* Dump the original user's spelling of argument index ARG_NO to the
- macro whose expansion is LIST. */
+/*
+ * The tokenizer's main loop. Returns a token list, representing a
+ * logical line in the input file. On EOF after some tokens have
+ * been processed, we return immediately. Then in next call, or if
+ * EOF occurred at the beginning of a logical line, a single CPP_EOF
+ * token is placed in the list.
+ */
+
static void
-dump_param_spelling (fp, list, arg_no)
- FILE *fp;
- const cpp_toklist *list;
- unsigned int arg_no;
+lex_line (pfile, list)
+ cpp_reader *pfile;
+ cpp_toklist *list;
{
- const U_CHAR *param = list->namebuf;
+ unsigned int first_token;
+ cpp_token *cur_token, *first;
+ cpp_buffer *buffer = pfile->buffer;
- while (arg_no--)
- param += ustrlen (param) + 1;
- ufputs (param, fp);
-}
+ pfile->state.in_lex_line = 1;
+ if (pfile->buffer->cur == pfile->buffer->buf)
+ list->flags |= BEG_OF_FILE;
-/* Output all the tokens of LIST, starting at TOKEN, to FP. */
-void
-cpp_output_list (pfile, fp, list, token)
- cpp_reader *pfile;
- FILE *fp;
- const cpp_toklist *list;
- const cpp_token *token;
-{
- const cpp_token *limit = list->tokens + list->tokens_used;
- const cpp_token *prev = 0;
- int white = 0;
+ retry:
+ pfile->state.in_directive = 0;
+ pfile->state.angled_headers = 0;
+ pfile->state.skip_newlines = 1;
+ pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments);
+ first_token = list->tokens_used;
+ list->file = buffer->nominal_fname;
- while (token < limit)
+ do
{
- /* XXX Find some way we can write macro args from inside
- output_token/spell_token. */
- if (token->type == CPP_MACRO_ARG)
+ if (list->tokens_used >= list->tokens_cap)
+ _cpp_expand_token_space (list, 256);
+
+ cur_token = list->tokens + list->tokens_used;
+ lex_token (pfile, cur_token);
+
+ if (pfile->state.skip_newlines)
{
- if (white && token->flags & PREV_WHITE)
- putc (' ', fp);
- if (token->flags & STRINGIFY_ARG)
- putc ('#', fp);
- dump_param_spelling (fp, list, token->val.aux);
+ pfile->state.skip_newlines = 0;
+ list->line = buffer->lineno;
+ if (cur_token->type == CPP_HASH)
+ {
+ pfile->state.in_directive = 1;
+ pfile->state.save_comments = 0;
+ pfile->state.indented = cur_token->flags & PREV_WHITE;
+ }
+ /* 6.10.3.10: Within the sequence of preprocessing tokens
+ making up the invocation of a function-like macro, new
+ line is considered a normal white-space character. */
+ else if (first_token != 0)
+ cur_token->flags |= PREV_WHITE;
}
- else
- output_token (pfile, fp, token, prev, white);
- if (token->flags & PASTE_LEFT)
- fputs (" ##", fp);
- prev = token;
- token++;
- white = 1;
+ else if (IN_DIRECTIVE (pfile) && list->tokens_used == first_token + 1)
+ {
+ if (cur_token->type == CPP_NUMBER)
+ list->directive = _cpp_check_linemarker (pfile, cur_token);
+ else
+ list->directive = _cpp_check_directive (pfile, cur_token);
+ }
+
+ /* _cpp_get_line assumes list->tokens_used refers to the current
+ token being lexed. So do this after _cpp_check_directive to
+ get the warnings therein correct. */
+ list->tokens_used++;
}
-}
+ while (cur_token->type != CPP_EOF);
+
+ /* All tokens are allocated, so the memory location is fixed. */
+ first = &list->tokens[first_token];
+ first->flags |= BOL;
+ pfile->first_directive_token = first;
+
+ /* Don't complain about the null directive, nor directives in
+ assembly source: we don't know where the comments are, and # may
+ introduce assembler pseudo-ops. Don't complain about invalid
+ directives in skipped conditional groups (6.10 p4). */
+ if (IN_DIRECTIVE (pfile) && !KNOWN_DIRECTIVE (list) && !pfile->skipping
+ && !CPP_OPTION (pfile, lang_asm))
+ {
+ if (cur_token > first + 1)
+ {
+ if (first[1].type == CPP_NAME)
+ cpp_error_with_line (pfile, first->line, first->col,
+ "invalid preprocessing directive #%s",
+ first[1].val.node->name);
+ else
+ cpp_error_with_line (pfile, first->line, first->col,
+ "invalid preprocessing directive");
+ }
+
+ /* Discard this line to prevent further errors from cc1. */
+ _cpp_clear_toklist (list);
+ goto retry;
+ }
+
+ /* Drop the EOF unless really at EOF or in a directive. */
+ if (cur_token != first && !KNOWN_DIRECTIVE (list)
+ && pfile->done_initializing)
+ list->tokens_used--;
+ pfile->state.in_lex_line = 0;
+}
/* Write the spelling of a token TOKEN to BUFFER. The buffer must
already contain the enough space to hold the token's spelling.
unsigned char c;
if (token->flags & DIGRAPH)
- spelling = digraph_spellings[token->type - CPP_FIRST_DIGRAPH];
+ spelling = _cpp_digraph_spellings[token->type - CPP_FIRST_DIGRAPH];
else if (token->flags & NAMED_OP)
goto spell_ident;
else
pfile->no_expand_level = context - pfile->contexts;
next = _cpp_get_token (pfile);
restore_macro_expansion (pfile, prev_nme);
+
if (next->type != CPP_OPEN_PAREN)
{
_cpp_push_token (pfile, next);
{
/* Duplicate the placemarker. Then we can set its flags and
position and safely be using more than one. */
- cpp_token *pm = duplicate_token (pfile, &placemarker_token);
- pm->flags = VOID_REST;
- save_token (args, pm);
+ save_token (args, duplicate_token (pfile, &placemarker_token));
args->ends[argc] = total + 1;
if (CPP_OPTION (pfile, c99) && CPP_PEDANTIC (pfile))
}
else
{
- cpp_error (pfile, "not enough arguments for macro \"%s\"", hp->name);
+ cpp_error (pfile, "%u arguments is not enough for macro \"%s\"",
+ argc, hp->name);
return 1;
}
}
else if (argc > macro->paramc
&& !(macro->paramc == 0 && argc == 1 && empty_argument (args, 0)))
{
- cpp_error (pfile, "too many arguments for macro \"%s\"", hp->name);
+ cpp_error (pfile, "%u arguments is too many for macro \"%s\"",
+ argc, hp->name);
return 1;
}
what the resulting token is. Returns CPP_EOF if the tokens cannot
be pasted, or the appropriate type for the merged token if they
can. */
-static enum cpp_ttype
-can_paste (pfile, token1, token2, digraph)
+enum cpp_ttype
+_cpp_can_paste (pfile, token1, token2, digraph)
cpp_reader * pfile;
const cpp_token *token1, *token2;
int* digraph;
pfile->paste_level = pfile->cur_context;
second = _cpp_get_token (pfile);
pfile->paste_level = 0;
+ context = CURRENT_CONTEXT (pfile);
/* Ignore placemarker argument tokens (cannot be from an empty
macro since macros are not expanded). */
a varargs parameter: the comma disappears if b was given
no actual arguments (not merely if b is an empty
argument). */
- if (token->type == CPP_COMMA && second->flags & VOID_REST)
+ if (token->type == CPP_COMMA && (context->flags & CONTEXT_VARARGS))
pasted = duplicate_token (pfile, second);
else
pasted = duplicate_token (pfile, token);
else
{
int digraph = 0;
- enum cpp_ttype type = can_paste (pfile, token, second, &digraph);
+ enum cpp_ttype type = _cpp_can_paste (pfile, token, second, &digraph);
if (type == CPP_EOF)
{
the author probably intended the ## to trigger
the special extended semantics (see above). */
if (token->type == CPP_COMMA
- && IS_ARG_CONTEXT (CURRENT_CONTEXT (pfile))
- && ON_REST_ARG (CURRENT_CONTEXT (pfile) - 1))
+ && (context->flags & CONTEXT_VARARGS))
/* no warning */;
else
cpp_warning (pfile,
/* See if there is another token to be pasted onto the one we just
constructed. */
token = pasted;
- context = CURRENT_CONTEXT (pfile);
/* and loop */
}
return token;
context->posn = 0;
context->level = args->level;
context->flags = CONTEXT_ARG | CONTEXT_RAW;
+ if ((context[-1].u.list->flags & VAR_ARGS)
+ && token->val.aux + 1 == (unsigned) context[-1].u.list->paramc)
+ context->flags |= CONTEXT_VARARGS;
context->pushed_token = 0;
/* Set the flags of the first token. There is one. */
/* Handle a preprocessing directive. TOKEN is the CPP_HASH token
introducing the directive. */
-static void
-process_directive (pfile, token)
+void
+_cpp_process_directive (pfile, token)
cpp_reader *pfile;
const cpp_token *token;
{
if (token->type == CPP_HASH && token->flags & BOL
&& pfile->token_list.directive)
{
- process_directive (pfile, token);
+ _cpp_process_directive (pfile, token);
continue;
}
unsigned int index;
const cpp_token *cur_token;
- if (pfile->in_lex_line)
+ if (pfile->state.in_lex_line)
index = pfile->token_list.tokens_used;
else
- index = pfile->contexts[0].posn;
-
- if (index == 0)
{
- if (pcol)
- *pcol = 0;
- return 0;
+ index = pfile->contexts[0].posn;
+
+ if (index == 0)
+ {
+ if (pcol)
+ *pcol = 0;
+ return 0;
+ }
+ index--;
}
- cur_token = &pfile->token_list.tokens[index - 1];
+ cur_token = &pfile->token_list.tokens[index];
if (pcol)
*pcol = cur_token->col;
return cur_token->line;
{
cpp_context *base;
- _cpp_init_toklist (&pfile->token_list, DUMMY_TOKEN);
+ _cpp_init_toklist (&pfile->token_list, 0);
pfile->no_expand_level = UINT_MAX;
pfile->context_cap = 20;
pfile->cur_context = 0;
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