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. */
+/*
+
+Cleanups to do:-
+
+o -dM and with _cpp_dump_list: too many \n output.
+o Put a printer object in cpp_reader?
+o Check line numbers assigned to all errors.
+o Replace strncmp with memcmp almost everywhere.
+o lex_line's use of cur_token, flags and list->token_used is a bit opaque.
+o Convert do_ functions to return void. Kaveh thinks its OK; and said he'll
+ give it a run when we've got some code.
+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.
+o Correct pastability test for CPP_NAME and CPP_NUMBER.
+
+*/
+
#include "config.h"
#include "system.h"
#include "intl.h"
#include "cpplib.h"
#include "cpphash.h"
+#include "symcat.h"
+
+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_PASTEL (1 << 0) /* An argument context on LHS of ##. */
+#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. */
+
+typedef struct cpp_context cpp_context;
+struct cpp_context
+{
+ union
+ {
+ const cpp_toklist *list; /* Used for macro contexts only. */
+ const cpp_token **arg; /* Used for arg contexts only. */
+ } u;
+
+ /* Pushed token to be returned by next call to get_raw_token. */
+ const cpp_token *pushed_token;
+
+ struct macro_args *args; /* The arguments for a function-like
+ macro. NULL otherwise. */
+ unsigned short posn; /* Current posn, index into u. */
+ unsigned short count; /* No. of tokens in u. */
+ unsigned short level;
+ unsigned char flags;
+};
+
+typedef struct macro_args macro_args;
+struct macro_args
+{
+ unsigned int *ends;
+ const cpp_token **tokens;
+ unsigned int capacity;
+ unsigned int used;
+ unsigned short level;
+};
+
+static const cpp_token *get_raw_token PARAMS ((cpp_reader *));
+static const cpp_token *parse_arg PARAMS ((cpp_reader *, int, unsigned int,
+ macro_args *, unsigned int *));
+static int parse_args PARAMS ((cpp_reader *, cpp_hashnode *, macro_args *));
+static void save_token PARAMS ((macro_args *, const cpp_token *));
+static int pop_context PARAMS ((cpp_reader *));
+static int push_macro_context PARAMS ((cpp_reader *, const cpp_token *));
+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 safe_fwrite PARAMS ((cpp_reader *, const U_CHAR *,
+ size_t, FILE *));
+static void dump_param_spelling PARAMS ((cpp_reader *, 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 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 lex_line PARAMS ((cpp_reader *, cpp_toklist *));
+static int lex_next PARAMS ((cpp_reader *, int));
+static int is_macro_disabled PARAMS ((cpp_reader *, const cpp_toklist *,
+ const cpp_token *));
+
+static cpp_token *stringify_arg PARAMS ((cpp_reader *, 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 *, const cpp_token *,
+ const cpp_token *));
+typedef unsigned int (* speller) PARAMS ((unsigned char *, cpp_toklist *,
+ cpp_token *));
+static cpp_token *make_string_token PARAMS ((cpp_token *, const U_CHAR *,
+ unsigned int));
+static cpp_token *alloc_number_token PARAMS ((cpp_reader *, int number));
+static const cpp_token *special_symbol PARAMS ((cpp_reader *, cpp_hashnode *,
+ const cpp_token *));
+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. */
+#define TOKEN_LEN(token) (5 + (TOKEN_SPELL(token) == SPELL_STRING \
+ ? (token)->val.str.len \
+ : (TOKEN_SPELL(token) == SPELL_IDENT \
+ ? (token)->val.node->length \
+ : 0)))
+
+#define IS_ARG_CONTEXT(c) ((c)->flags & CONTEXT_ARG)
+#define CURRENT_CONTEXT(pfile) ((pfile)->contexts + (pfile)->cur_context)
+
+#define ASSIGN_FLAGS_AND_POS(d, s) \
+ do {(d)->flags = (s)->flags & (PREV_WHITE | BOL | PASTE_LEFT); \
+ if ((d)->flags & BOL) {(d)->col = (s)->col; (d)->line = (s)->line;} \
+ } while (0)
+
+/* f is flags, just consisting of PREV_WHITE | BOL. */
+#define MODIFY_FLAGS_AND_POS(d, s, f) \
+ do {(d)->flags &= ~(PREV_WHITE | BOL); (d)->flags |= (f); \
+ if ((f) & BOL) {(d)->col = (s)->col; (d)->line = (s)->line;} \
+ } while (0)
+
+#define OP(e, s) { SPELL_OPERATOR, U s },
+#define TK(e, s) { s, U STRINGX (e) },
+
+const struct token_spelling
+_cpp_token_spellings [N_TTYPES] = {TTYPE_TABLE };
+
+#undef OP
+#undef TK
+
+/* The following table is used by trigraph_ok/trigraph_replace. If we
+ have designated initializers, it can be constant data; otherwise,
+ it is set up at runtime by _cpp_init_input_buffer. */
+
+#if (GCC_VERSION >= 2007)
+#define init_trigraph_map() /* nothing */
+#define TRIGRAPH_MAP \
+__extension__ static const U_CHAR trigraph_map[UCHAR_MAX + 1] = {
+#define END };
+#define s(p, v) [p] = v,
+#else
+#define TRIGRAPH_MAP static U_CHAR trigraph_map[UCHAR_MAX + 1] = { 0 }; \
+ static void init_trigraph_map PARAMS ((void)) { \
+ unsigned char *x = trigraph_map;
+#define END }
+#define s(p, v) x[p] = v;
+#endif
+
+TRIGRAPH_MAP
+ s('=', '#') s(')', ']') s('!', '|')
+ s('(', '[') s('\'', '^') s('>', '}')
+ s('/', '\\') s('<', '{') s('-', '~')
+END
-#define PEEKBUF(BUFFER, N) \
- ((BUFFER)->rlimit - (BUFFER)->cur > (N) ? (BUFFER)->cur[N] : EOF)
-#define GETBUF(BUFFER) \
- ((BUFFER)->cur < (BUFFER)->rlimit ? *(BUFFER)->cur++ : EOF)
-#define FORWARDBUF(BUFFER, N) ((BUFFER)->cur += (N))
-
-#define PEEKN(N) PEEKBUF (CPP_BUFFER (pfile), N)
-#define FORWARD(N) FORWARDBUF (CPP_BUFFER (pfile), (N))
-#define GETC() GETBUF (CPP_BUFFER (pfile))
-#define PEEKC() PEEKBUF (CPP_BUFFER (pfile), 0)
-
-static void skip_block_comment PARAMS ((cpp_reader *));
-static void skip_line_comment PARAMS ((cpp_reader *));
-static int maybe_macroexpand PARAMS ((cpp_reader *, long));
-static int skip_comment PARAMS ((cpp_reader *, int));
-static int copy_comment PARAMS ((cpp_reader *, int));
-static void skip_string PARAMS ((cpp_reader *, int));
-static void parse_string PARAMS ((cpp_reader *, int));
-static U_CHAR *find_position PARAMS ((U_CHAR *, U_CHAR *, unsigned long *));
-static int null_cleanup PARAMS ((cpp_buffer *, cpp_reader *));
-static void null_warning PARAMS ((cpp_reader *, unsigned int));
+#undef TRIGRAPH_MAP
+#undef END
+#undef s
/* Re-allocates PFILE->token_buffer so it will hold at least N more chars. */
CPP_SET_WRITTEN (pfile, old_written);
}
-static int
-null_cleanup (pbuf, pfile)
- cpp_buffer *pbuf ATTRIBUTE_UNUSED;
- cpp_reader *pfile ATTRIBUTE_UNUSED;
+/* Deal with the annoying semantics of fwrite. */
+static void
+safe_fwrite (pfile, buf, len, fp)
+ cpp_reader *pfile;
+ const U_CHAR *buf;
+ size_t len;
+ FILE *fp;
{
- return 0;
+ size_t count;
+
+ while (len)
+ {
+ count = fwrite (buf, 1, len, fp);
+ if (count == 0)
+ goto error;
+ len -= count;
+ buf += count;
+ }
+ return;
+
+ error:
+ cpp_notice_from_errno (pfile, CPP_OPTION (pfile, out_fname));
}
-/* Allocate a new cpp_buffer for PFILE, and push it on the input buffer stack.
- If BUFFER != NULL, then use the LENGTH characters in BUFFER
- as the new input buffer.
- Return the new buffer, or NULL on failure. */
+/* Notify the compiler proper that the current line number has jumped,
+ or the current file name has changed. */
-cpp_buffer *
-cpp_push_buffer (pfile, buffer, length)
+static void
+output_line_command (pfile, print, line)
cpp_reader *pfile;
- const U_CHAR *buffer;
- long length;
+ cpp_printer *print;
+ unsigned int line;
{
- cpp_buffer *buf = CPP_BUFFER (pfile);
- cpp_buffer *new;
- if (++pfile->buffer_stack_depth == CPP_STACK_MAX)
- {
- cpp_fatal (pfile, "macro or `#include' recursion too deep");
- return NULL;
- }
+ cpp_buffer *ip = CPP_BUFFER (pfile);
+ enum { same = 0, enter, leave, rname } change;
+ static const char * const codes[] = { "", " 1", " 2", "" };
+
+ if (line == 0)
+ return;
- new = (cpp_buffer *) xcalloc (1, sizeof (cpp_buffer));
+ /* End the previous line of text. */
+ if (pfile->need_newline)
+ putc ('\n', print->outf);
+ pfile->need_newline = 0;
- new->if_stack = pfile->if_stack;
- new->cleanup = null_cleanup;
- new->buf = new->cur = buffer;
- new->rlimit = buffer + length;
- new->prev = buf;
- new->mark = NULL;
- new->line_base = NULL;
+ if (CPP_OPTION (pfile, no_line_commands))
+ return;
+
+ /* If ip is null, we've been called from cpp_finish, and they just
+ needed the final flush and trailing newline. */
+ if (!ip)
+ return;
+
+ if (pfile->include_depth == print->last_id)
+ {
+ /* Determine whether the current filename has changed, and if so,
+ how. 'nominal_fname' values are unique, so they can be compared
+ by comparing pointers. */
+ if (ip->nominal_fname == print->last_fname)
+ change = same;
+ else
+ change = rname;
+ }
+ else
+ {
+ if (pfile->include_depth > print->last_id)
+ change = enter;
+ else
+ change = leave;
+ print->last_id = pfile->include_depth;
+ }
+ print->last_fname = ip->nominal_fname;
+
+ /* 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.) */
+ if (change == same && print->lineno > 0
+ && line >= print->lineno && line < print->lineno + 8)
+ {
+ while (line > print->lineno)
+ {
+ putc ('\n', print->outf);
+ print->lineno++;
+ }
+ return;
+ }
- CPP_BUFFER (pfile) = new;
- return new;
+#ifndef NO_IMPLICIT_EXTERN_C
+ if (CPP_OPTION (pfile, cplusplus))
+ fprintf (print->outf, "# %u \"%s\"%s%s%s\n", line, ip->nominal_fname,
+ codes[change],
+ ip->inc->sysp ? " 3" : "",
+ (ip->inc->sysp == 2) ? " 4" : "");
+ else
+#endif
+ fprintf (print->outf, "# %u \"%s\"%s%s\n", line, ip->nominal_fname,
+ codes[change],
+ ip->inc->sysp ? " 3" : "");
+ print->lineno = line;
}
-cpp_buffer *
-cpp_pop_buffer (pfile)
+/* Write the contents of the token_buffer to the output stream, and
+ clear the token_buffer. Also handles generating line commands and
+ keeping track of file transitions. */
+
+void
+cpp_output_tokens (pfile, print, line)
cpp_reader *pfile;
+ cpp_printer *print;
+ unsigned int line;
{
- cpp_buffer *buf = CPP_BUFFER (pfile);
- if (ACTIVE_MARK_P (pfile))
- cpp_ice (pfile, "mark active in cpp_pop_buffer");
- (*buf->cleanup) (buf, pfile);
- CPP_BUFFER (pfile) = CPP_PREV_BUFFER (buf);
- free (buf);
- pfile->buffer_stack_depth--;
- return CPP_BUFFER (pfile);
+ if (CPP_WRITTEN (pfile) - print->written)
+ {
+ safe_fwrite (pfile, pfile->token_buffer,
+ CPP_WRITTEN (pfile) - print->written, print->outf);
+ pfile->need_newline = 1;
+ if (print->lineno)
+ print->lineno++;
+
+ CPP_SET_WRITTEN (pfile, print->written);
+ }
+ output_line_command (pfile, print, line);
}
-/* Scan until CPP_BUFFER (PFILE) is exhausted into PFILE->token_buffer.
- Pop the buffer when done. */
+/* Scan until CPP_BUFFER (PFILE) is exhausted, discarding output. */
void
-cpp_scan_buffer (pfile)
+cpp_scan_buffer_nooutput (pfile)
cpp_reader *pfile;
{
- cpp_buffer *buffer = CPP_BUFFER (pfile);
- enum cpp_token token;
- if (CPP_OPTION (pfile, no_output))
+ cpp_buffer *stop = CPP_PREV_BUFFER (CPP_BUFFER (pfile));
+ const cpp_token *token;
+
+ /* In no-output mode, we can ignore everything but directives. */
+ for (;;)
{
- long old_written = CPP_WRITTEN (pfile);
- /* In no-output mode, we can ignore everything but directives. */
- for (;;)
+ token = _cpp_get_token (pfile);
+
+ if (token->type == CPP_EOF)
{
- if (! pfile->only_seen_white)
- _cpp_skip_rest_of_line (pfile);
- token = cpp_get_token (pfile);
- if (token == CPP_EOF) /* Should not happen ... */
+ cpp_pop_buffer (pfile);
+ if (CPP_BUFFER (pfile) == stop)
break;
- if (token == CPP_POP && CPP_BUFFER (pfile) == buffer)
- {
- if (CPP_PREV_BUFFER (CPP_BUFFER (pfile)) != NULL)
- cpp_pop_buffer (pfile);
- break;
- }
}
- CPP_SET_WRITTEN (pfile, old_written);
+
+ if (token->type == CPP_HASH && token->flags & BOL
+ && pfile->token_list.directive)
+ {
+ process_directive (pfile, token);
+ continue;
+ }
+
+ _cpp_skip_rest_of_line (pfile);
}
- else
+}
+
+/* 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 (;;)
{
- for (;;)
+ token = _cpp_get_token (pfile);
+ if (token->type == CPP_EOF)
{
- token = cpp_get_token (pfile);
- if (token == CPP_EOF) /* Should not happen ... */
- break;
- if (token == CPP_POP && CPP_BUFFER (pfile) == buffer)
+ cpp_pop_buffer (pfile);
+
+ if (CPP_BUFFER (pfile))
+ cpp_output_tokens (pfile, print, CPP_BUF_LINE (CPP_BUFFER (pfile)));
+
+ if (CPP_BUFFER (pfile) == stop)
+ return;
+
+ prev = 0;
+ continue;
+ }
+
+ if (token->flags & BOL)
+ {
+ if (token->type == CPP_HASH && pfile->token_list.directive)
{
- if (CPP_PREV_BUFFER (CPP_BUFFER (pfile)) != NULL)
- cpp_pop_buffer (pfile);
- break;
+ process_directive (pfile, token);
+ continue;
}
+
+ cpp_output_tokens (pfile, print, pfile->token_list.line);
+ prev = 0;
}
+
+ if (token->type != CPP_PLACEMARKER)
+ output_token (pfile, token, prev);
+
+ prev = token;
}
}
-/*
- * Rescan a string (which may have escape marks) into pfile's buffer.
- * Place the result in pfile->token_buffer.
- *
- * The input is copied before it is scanned, so it is safe to pass
- * it something from the token_buffer that will get overwritten
- * (because it follows CPP_WRITTEN). This is used by do_include.
- */
+/* Scan a single line of the input into the token_buffer. */
+int
+cpp_scan_line (pfile)
+ cpp_reader *pfile;
+{
+ const cpp_token *token, *prev = 0;
-void
-cpp_expand_to_buffer (pfile, buf, length)
+ if (pfile->buffer == NULL)
+ return 0;
+
+ do
+ {
+ token = cpp_get_token (pfile);
+ if (token->type == CPP_EOF)
+ {
+ cpp_pop_buffer (pfile);
+ break;
+ }
+
+ /* If the last token on a line results from a macro expansion,
+ the check below will fail to stop us from proceeding to the
+ next line - so make sure we stick in a newline, at least. */
+ if (token->flags & BOL)
+ CPP_PUTC (pfile, '\n');
+
+ output_token (pfile, token, prev);
+ prev = token;
+ }
+ while (pfile->cur_context > 0
+ || pfile->contexts[0].posn < pfile->contexts[0].count);
+ return 1;
+}
+
+/* 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 <. */
+const cpp_token *
+_cpp_glue_header_name (pfile)
cpp_reader *pfile;
- const U_CHAR *buf;
- int length;
{
- register cpp_buffer *ip;
- U_CHAR *buf1;
- int save_no_output;
+ unsigned int written = CPP_WRITTEN (pfile);
+ const cpp_token *t;
+ cpp_token *hdr;
+ U_CHAR *buf;
+ size_t len;
- if (length < 0)
+ for (;;)
{
- cpp_ice (pfile, "length < 0 in cpp_expand_to_buffer");
- return;
+ t = _cpp_get_token (pfile);
+ if (t->type == CPP_GREATER || t->type == CPP_EOF)
+ break;
+
+ CPP_RESERVE (pfile, TOKEN_LEN (t));
+ if (t->flags & PREV_WHITE)
+ CPP_PUTC_Q (pfile, ' ');
+ pfile->limit = spell_token (pfile, t, pfile->limit);
}
- /* Set up the input on the input stack. */
+ if (t->type == CPP_EOF)
+ cpp_error (pfile, "missing terminating > character");
+
+ len = CPP_WRITTEN (pfile) - written;
+ buf = xmalloc (len);
+ memcpy (buf, pfile->token_buffer + written, len);
+ CPP_SET_WRITTEN (pfile, written);
+
+ hdr = get_temp_token (pfile);
+ hdr->type = CPP_HEADER_NAME;
+ hdr->flags = 0;
+ hdr->val.str.text = buf;
+ hdr->val.str.len = len;
+ return hdr;
+}
- buf1 = (U_CHAR *) alloca (length + 1);
- memcpy (buf1, buf, length);
- buf1[length] = 0;
+/* Token-buffer helper functions. */
- ip = cpp_push_buffer (pfile, buf1, length);
- if (ip == NULL)
- return;
- ip->has_escapes = 1;
+/* Expand a token list's string space. It is *vital* that
+ list->tokens_used is correct, to get pointer fix-up right. */
+void
+_cpp_expand_name_space (list, len)
+ cpp_toklist *list;
+ unsigned int len;
+{
+ const U_CHAR *old_namebuf;
+
+ old_namebuf = list->namebuf;
+ list->name_cap += len;
+ list->namebuf = (unsigned char *) xrealloc (list->namebuf, list->name_cap);
+
+ /* Fix up token text pointers. */
+ if (list->namebuf != old_namebuf)
+ {
+ unsigned int i;
+
+ for (i = 0; i < list->tokens_used; i++)
+ if (TOKEN_SPELL (&list->tokens[i]) == SPELL_STRING)
+ list->tokens[i].val.str.text += (list->namebuf - old_namebuf);
+ }
+}
- /* Scan the input, create the output. */
- save_no_output = CPP_OPTION (pfile, no_output);
- CPP_OPTION (pfile, no_output) = 0;
- CPP_OPTION (pfile, no_line_commands)++;
- cpp_scan_buffer (pfile);
- CPP_OPTION (pfile, no_line_commands)--;
- CPP_OPTION (pfile, no_output) = save_no_output;
+/* If there is not enough room for LEN more characters, expand the
+ list by just enough to have room for LEN characters. */
+void
+_cpp_reserve_name_space (list, len)
+ cpp_toklist *list;
+ unsigned int len;
+{
+ unsigned int room = list->name_cap - list->name_used;
+
+ if (room < len)
+ _cpp_expand_name_space (list, len - room);
+}
- CPP_NUL_TERMINATE (pfile);
+/* Expand the number of tokens in a list. */
+void
+_cpp_expand_token_space (list, count)
+ 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. */
}
+/* 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. */
void
-cpp_buf_line_and_col (pbuf, linep, colp)
- register cpp_buffer *pbuf;
- long *linep, *colp;
+_cpp_init_toklist (list, flags)
+ cpp_toklist *list;
+ int flags;
{
- if (pbuf)
+ if (flags == NO_DUMMY_TOKEN)
{
- *linep = pbuf->lineno;
- if (colp)
- *colp = pbuf->cur - pbuf->line_base;
+ list->tokens_cap = 0;
+ list->tokens = 0;
+ list->name_cap = 0;
+ list->namebuf = 0;
+ list->flags = 0;
}
else
{
- *linep = 0;
- if (colp)
- *colp = 0;
+ /* Initialize token space. Put a dummy token before the start
+ that will fail matches. */
+ 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);
}
-/* Return the topmost cpp_buffer that corresponds to a file (not a macro). */
+/* Clear a token list. */
+void
+_cpp_clear_toklist (list)
+ cpp_toklist *list;
+{
+ list->tokens_used = 0;
+ list->name_used = 0;
+ list->directive = 0;
+ list->paramc = 0;
+ list->params_len = 0;
+ list->flags &= LIST_OFFSET; /* clear all but that one */
+}
-cpp_buffer *
-cpp_file_buffer (pfile)
- cpp_reader *pfile;
+/* Free a token list. Does not free the list itself, which may be
+ embedded in a larger structure. */
+void
+_cpp_free_toklist (list)
+ const cpp_toklist *list;
{
- cpp_buffer *ip;
+ if (list->flags & LIST_OFFSET)
+ free (list->tokens - 1); /* Backup over dummy token. */
+ else
+ free (list->tokens);
+ free (list->namebuf);
+}
+
+/* Compare two tokens. */
+int
+_cpp_equiv_tokens (a, b)
+ const cpp_token *a, *b;
+{
+ if (a->type == b->type && a->flags == b->flags)
+ switch (TOKEN_SPELL (a))
+ {
+ default: /* Keep compiler happy. */
+ case SPELL_OPERATOR:
+ return 1;
+ case SPELL_CHAR:
+ case SPELL_NONE:
+ return a->val.aux == b->val.aux; /* arg_no or character. */
+ case SPELL_IDENT:
+ return a->val.node == b->val.node;
+ case SPELL_STRING:
+ return (a->val.str.len == b->val.str.len
+ && !memcmp (a->val.str.text, b->val.str.text,
+ a->val.str.len));
+ }
- for (ip = CPP_BUFFER (pfile); ip; ip = CPP_PREV_BUFFER (ip))
- if (ip->ihash != NULL)
- return ip;
- return NULL;
+ return 0;
}
-/* Skip a C-style block comment. We know it's a comment, and point is
- at the second character of the starter. */
-static void
-skip_block_comment (pfile)
- cpp_reader *pfile;
+/* Compare two token lists. */
+int
+_cpp_equiv_toklists (a, b)
+ const cpp_toklist *a, *b;
{
- int c, prev_c = -1;
- long line, col;
+ unsigned int i;
- FORWARD(1);
- cpp_buf_line_and_col (CPP_BUFFER (pfile), &line, &col);
- for (;;)
- {
- c = GETC ();
- if (c == EOF)
- {
- cpp_error_with_line (pfile, line, col, "unterminated comment");
- return;
- }
- else if (c == '\n' || c == '\r')
- {
- /* \r cannot be a macro escape marker here. */
- if (!ACTIVE_MARK_P (pfile))
- CPP_BUMP_LINE (pfile);
- }
- else if (c == '/' && prev_c == '*')
- return;
- else if (c == '*' && prev_c == '/'
- && CPP_OPTION (pfile, warn_comments))
- cpp_warning (pfile, "`/*' within comment");
+ if (a->tokens_used != b->tokens_used
+ || a->flags != b->flags
+ || a->paramc != b->paramc)
+ return 0;
+
+ for (i = 0; i < a->tokens_used; i++)
+ if (! _cpp_equiv_tokens (&a->tokens[i], &b->tokens[i]))
+ return 0;
+ return 1;
+}
+
+/* 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;
+{
+ if (token->type != CPP_NAME)
+ return 0;
- prev_c = c;
+ 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.
+
+*/
+
+static const unsigned char *digraph_spellings [] = {U"%:", U"%:%:", U"<:",
+ U":>", U"<%", U"%>"};
+
+/* 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. */
+static int
+trigraph_ok (pfile, end)
+ cpp_reader *pfile;
+ const unsigned char *end;
+{
+ int accept = CPP_OPTION (pfile, trigraphs);
+
+ if (CPP_OPTION (pfile, warn_trigraphs))
+ {
+ unsigned int col = end - 1 - pfile->buffer->line_base;
+ if (accept)
+ cpp_warning_with_line (pfile, pfile->buffer->lineno, col,
+ "trigraph ??%c converted to %c",
+ (int) *end, (int) trigraph_map[*end]);
+ else
+ cpp_warning_with_line (pfile, pfile->buffer->lineno, col,
+ "trigraph ??%c ignored", (int) *end);
}
+ return accept;
}
-/* Skip a C++/Chill line comment. We know it's a comment, and point
- is at the second character of the initiator. */
-static void
-skip_line_comment (pfile)
+/* 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. */
+
+static unsigned char *
+trigraph_replace (pfile, src, limit)
cpp_reader *pfile;
+ unsigned char *src;
+ unsigned char *limit;
{
- FORWARD(1);
- for (;;)
+ unsigned char *dest;
+
+ /* Starting with src[1], find two consecutive '?'. The case of no
+ trigraphs is streamlined. */
+
+ for (src++; src + 1 < limit; src += 2)
{
- int c = GETC ();
+ if (src[0] != '?')
+ continue;
- /* We don't have to worry about EOF in here. */
- if (c == '\n')
- {
- /* Don't consider final '\n' to be part of comment. */
- FORWARD(-1);
- return;
- }
- else if (c == '\r')
- {
- /* \r cannot be a macro escape marker here. */
- if (!ACTIVE_MARK_P (pfile))
- CPP_BUMP_LINE (pfile);
- if (CPP_OPTION (pfile, warn_comments))
- cpp_warning (pfile, "backslash-newline within line comment");
- }
+ /* Make src point to the 1st (NOT 2nd) of two consecutive '?'s. */
+ if (src[-1] == '?')
+ src--;
+ else if (src + 2 == limit || src[1] != '?')
+ continue;
+
+ /* Check if it really is a trigraph. */
+ if (trigraph_map[src[2]] == 0)
+ continue;
+
+ dest = src;
+ goto trigraph_found;
}
+ return limit;
+
+ /* 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] == '?' && trigraph_map[src[2]])
+ {
+ trigraph_found:
+ src += 2;
+ if (trigraph_ok (pfile, pfile->buffer->cur - (limit - src)))
+ *dest = trigraph_map[*src];
+ }
+
+ /* Copy remaining (at most 2) characters. */
+ while (src < limit)
+ *dest++ = *src++;
+ return dest;
}
-/* Skip a comment - C, C++, or Chill style. M is the first character
- of the comment marker. If this really is a comment, skip to its
- end and return ' '. If this is not a comment, return M (which will
- be '/' or '-'). */
+/* 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;
+{
+ if (cur[0] == '\\')
+ return cur;
+ if (cur[0] == '/' && cur[-1] == '?' && cur[-2] == '?'
+ && trigraph_ok (pfile, cur))
+ return cur - 2;
+ return 0;
+}
+/* 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. */
static int
-skip_comment (pfile, m)
+skip_block_comment (pfile)
cpp_reader *pfile;
- int m;
{
- if (m == '/' && PEEKC() == '*')
- {
- skip_block_comment (pfile);
- return ' ';
- }
- else if (m == '/' && PEEKC() == '/')
+ cpp_buffer *buffer = pfile->buffer;
+ const unsigned char *char_after_star = 0;
+ const unsigned char *cur = buffer->cur;
+
+ for (; cur < buffer->rlimit; )
{
- if (CPP_BUFFER (pfile)->system_header_p)
- {
- /* We silently allow C++ comments in system headers, irrespective
- of conformance mode, because lots of busted systems do that
- and trying to clean it up in fixincludes is a nightmare. */
- skip_line_comment (pfile);
- return ' ';
- }
- else if (CPP_OPTION (pfile, cplusplus_comments))
+ unsigned char c = *cur++;
+
+ /* People like decorating comments with '*', so check for
+ '/' instead for efficiency. */
+ if (c == '/')
{
- if (CPP_OPTION (pfile, c89)
- && CPP_PEDANTIC (pfile)
- && ! CPP_BUFFER (pfile)->warned_cplusplus_comments)
+ /* Don't view / then * then / as finishing the comment. */
+ if ((cur[-2] == '*' && cur - 1 > buffer->cur)
+ || cur - 1 == char_after_star)
{
- 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_BUFFER (pfile)->warned_cplusplus_comments = 1;
+ buffer->cur = cur;
+ return 0;
+ }
+
+ /* Warn about potential nested comments, but not when
+ the final character inside the comment is a '/'.
+ Don't bother to get it right across escaped newlines. */
+ if (CPP_OPTION (pfile, warn_comments) && cur + 1 < buffer->rlimit
+ && cur[0] == '*' && cur[1] != '/')
+ {
+ buffer->cur = cur;
+ cpp_warning (pfile, "'/*' within comment");
}
- skip_line_comment (pfile);
- return ' ';
}
- else
- return m;
- }
- else if (m == '-' && PEEKC() == '-'
- && CPP_OPTION (pfile, chill))
- {
- skip_line_comment (pfile);
- return ' ';
+ 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;
+ }
+ else if (c == '\t')
+ adjust_column (pfile, cur - 1);
}
- else
- return m;
+
+ buffer->cur = cur;
+ return 1;
}
-/* Identical to skip_comment except that it copies the comment into the
- token_buffer. This is used if !discard_comments. */
+/* Skip a C++ line comment. Handles escaped newlines. Returns
+ non-zero if a multiline comment. */
static int
-copy_comment (pfile, m)
+skip_line_comment (pfile)
cpp_reader *pfile;
- int m;
{
- const U_CHAR *start = CPP_BUFFER (pfile)->cur; /* XXX Layering violation */
- const U_CHAR *limit;
+ cpp_buffer *buffer = pfile->buffer;
+ register const unsigned char *cur = buffer->cur;
+ int multiline = 0;
- if (skip_comment (pfile, m) == m)
- return m;
+ for (; cur < buffer->rlimit; )
+ {
+ unsigned char c = *cur++;
- limit = CPP_BUFFER (pfile)->cur;
- CPP_RESERVE (pfile, limit - start + 2);
- CPP_PUTC_Q (pfile, m);
- for (; start <= limit; start++)
- if (*start != '\r')
- CPP_PUTC_Q (pfile, *start);
+ 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);
+ }
+ }
+ cur++;
- return ' ';
+ out:
+ buffer->cur = cur - 1; /* Leave newline for caller. */
+ return multiline;
}
+/* TAB points to a \t character. Update col_adjust so we track the
+ column correctly. */
static void
-null_warning (pfile, count)
+adjust_column (pfile, tab)
cpp_reader *pfile;
- unsigned int count;
+ const U_CHAR *tab;
{
- if (count == 1)
- cpp_warning (pfile, "embedded null character ignored");
- else
- cpp_warning (pfile, "embedded null characters ignored");
-}
+ /* Zero-based column. */
+ unsigned int col = CPP_BUF_COLUMN (pfile->buffer, tab);
-/* Skip whitespace \-newline and comments. Does not macro-expand. */
+ /* 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;
+}
-void
-_cpp_skip_hspace (pfile)
+/* 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. */
+static void
+skip_whitespace (pfile, in_directive)
cpp_reader *pfile;
+ int in_directive;
{
- unsigned int null_count = 0;
- int c;
+ cpp_buffer *buffer = pfile->buffer;
+ unsigned short warned = 0;
- while (1)
+ /* We only want non-vertical space, i.e. ' ' \t \f \v \0. */
+ while (buffer->cur < buffer->rlimit)
{
- c = GETC();
- if (c == EOF)
- goto out;
- else if (is_hspace(c))
- {
- if ((c == '\f' || c == '\v') && CPP_PEDANTIC (pfile))
- cpp_pedwarn (pfile, "%s in preprocessing directive",
- c == '\f' ? "formfeed" : "vertical tab");
- else if (c == '\0')
- null_count++;
- }
- else if (c == '\r')
- {
- /* \r is a backslash-newline marker if !has_escapes, and
- a deletable-whitespace or no-reexpansion marker otherwise. */
- if (CPP_BUFFER (pfile)->has_escapes)
- {
- if (PEEKC() == ' ')
- FORWARD(1);
- else
- break;
- }
- else
- CPP_BUMP_LINE (pfile);
- }
- else if (c == '/' || c == '-')
+ 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. */
+ else if (c == '\0')
{
- c = skip_comment (pfile, c);
- if (c != ' ')
- break;
+ if (!warned)
+ cpp_warning_with_line (pfile, CPP_BUF_LINE (buffer),
+ CPP_BUF_COL (buffer),
+ "embedded null character ignored");
+ warned = 1;
}
- else
- break;
+ else if (in_directive && 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");
}
- FORWARD(-1);
- out:
- if (null_count)
- null_warning (pfile, null_count);
}
-/* Read and discard the rest of the current line. */
-
-void
-_cpp_skip_rest_of_line (pfile)
+/* 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;
{
- for (;;)
+ const U_CHAR *name;
+ unsigned int len;
+ unsigned int r;
+
+ name = cur;
+ r = 0;
+ while (cur < rlimit)
{
- int c = GETC();
- switch (c)
+ if (! is_idchar (*cur))
+ break;
+ /* $ is not a legal identifier character in the standard, but is
+ commonly accepted as an extension. Don't warn about it in
+ skipped conditional blocks. */
+ if (*cur == '$' && CPP_PEDANTIC (pfile) && ! pfile->skipping)
{
- case '\n':
- FORWARD(-1);
- case EOF:
- return;
+ CPP_BUFFER (pfile)->cur = cur;
+ cpp_pedwarn (pfile, "'$' character in identifier");
+ }
- case '\r':
- if (! CPP_BUFFER (pfile)->has_escapes)
- CPP_BUMP_LINE (pfile);
- break;
-
- case '\'':
- case '\"':
- skip_string (pfile, c);
- break;
+ r = HASHSTEP (r, cur);
+ cur++;
+ }
+ len = cur - name;
- case '/':
- case '-':
- skip_comment (pfile, c);
- break;
+ if (tok->val.node == 0)
+ tok->val.node = _cpp_lookup_with_hash (pfile, name, len, r);
+ else
+ {
+ unsigned int oldlen = tok->val.node->length;
+ U_CHAR *newname = alloca (oldlen + len);
+ memcpy (newname, tok->val.node->name, oldlen);
+ memcpy (newname + oldlen, name, len);
+ tok->val.node = cpp_lookup (pfile, newname, len + oldlen);
+ }
- case '\f':
- case '\v':
- if (CPP_PEDANTIC (pfile))
- cpp_pedwarn (pfile, "%s in preprocessing directive",
- c == '\f' ? "formfeed" : "vertical tab");
- break;
+ return cur;
+}
- }
+/* Parse (append) a number. */
+static void
+parse_number (pfile, list, name)
+ cpp_reader *pfile;
+ cpp_toklist *list;
+ cpp_string *name;
+{
+ 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;
+
+ for (; cur < buffer->rlimit && namebuf < name_limit; )
+ {
+ unsigned char c = *namebuf = *cur; /* Copy a single char. */
+
+ /* Perhaps we should accept '$' here if we accept it for
+ identifiers. We know namebuf[-1] is safe, because for c to
+ be a sign we must have pushed at least one character. */
+ if (!is_numchar (c) && c != '.' && ! VALID_SIGN (c, namebuf[-1]))
+ goto out;
+
+ namebuf++;
+ cur++;
}
+
+ /* Run out of name space? */
+ if (cur < buffer->rlimit)
+ {
+ list->name_used = namebuf - list->namebuf;
+ auto_expand_name_space (list);
+ goto expanded;
+ }
+
+ out:
+ buffer->cur = cur;
+ name->len = namebuf - name->text;
+ list->name_used = namebuf - list->namebuf;
}
-/* Parse an identifier starting with C. */
+/* Places a string terminated by an unescaped TERMINATOR into a
+ cpp_string, which should be expandable and thus at the top of the
+ list's stack. Handles embedded trigraphs, if necessary, and
+ escaped newlines.
-void
-_cpp_parse_name (pfile, c)
+ Can be used for character constants (terminator = '\''), string
+ constants ('"') and angled headers ('>'). Multi-line strings are
+ allowed, except for within directives. */
+
+static void
+parse_string (pfile, list, token, terminator)
cpp_reader *pfile;
- int c;
+ cpp_toklist *list;
+ cpp_token *token;
+ unsigned int terminator;
{
- for (;;)
- {
- if (! is_idchar(c))
- {
- FORWARD (-1);
- break;
- }
+ cpp_buffer *buffer = pfile->buffer;
+ cpp_string *name = &token->val.str;
+ register const unsigned char *cur = buffer->cur;
+ const unsigned char *name_limit;
+ unsigned char *namebuf;
+ unsigned int null_count = 0;
+ unsigned int trigraphed = list->name_used;
- if (c == '$' && CPP_PEDANTIC (pfile))
- cpp_pedwarn (pfile, "`$' in identifier");
+ expanded:
+ name_limit = list->namebuf + list->name_cap;
+ namebuf = list->namebuf + list->name_used;
- CPP_RESERVE(pfile, 2); /* One more for final NUL. */
- CPP_PUTC_Q (pfile, c);
- c = GETC();
- if (c == EOF)
- break;
- }
- CPP_NUL_TERMINATE_Q (pfile);
- return;
+ 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. */
+ if (namebuf[-1] == '\\')
+ {
+ handle_newline (cur, buffer->rlimit, c);
+ namebuf--;
+ continue;
+ }
+
+ 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");
+ }
+
+ *namebuf++ = '\n';
+ handle_newline (cur, buffer->rlimit, c);
+ }
+ else
+ {
+ unsigned char *temp;
+
+ /* An odd number of consecutive backslashes represents
+ an escaped terminator. */
+ temp = namebuf - 1;
+ while (temp >= name->text && *temp == '\\')
+ temp--;
+
+ if ((namebuf - temp) & 1)
+ goto out;
+ namebuf++;
+ }
+ }
+ }
+
+ /* Run out of name space? */
+ if (cur < buffer->rlimit)
+ {
+ list->name_used = namebuf - list->namebuf;
+ auto_expand_name_space (list);
+ goto expanded;
+ }
+
+ /* 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);
+
+ 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;
+
+ if (null_count > 0)
+ cpp_warning (pfile, (null_count > 1 ? "null characters preserved"
+ : "null character preserved"));
}
-/* Parse and skip over a string starting with C. A single quoted
- string is treated like a double -- some programs (e.g., troff) are
- perverse this way. (However, a single quoted string is not allowed
- to extend over multiple lines.) */
+/* 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
static void
-skip_string (pfile, c)
- cpp_reader *pfile;
- int c;
+save_comment (list, token, from, len, type)
+ cpp_toklist *list;
+ cpp_token *token;
+ const unsigned char *from;
+ unsigned int len;
+ unsigned int type;
{
- long start_line, start_column;
- unsigned int null_count = 0;
+ 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_buf_line_and_col (cpp_file_buffer (pfile), &start_line, &start_column);
- while (1)
+ /* Copy the comment. */
+ if (type == '*')
{
- int cc = GETC();
- switch (cc)
+ *buffer++ = '/';
+ *buffer++ = '*';
+ }
+ else
+ {
+ *buffer++ = type;
+ *buffer++ = type;
+ }
+ 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)
+
+static void
+lex_line (pfile, list)
+ cpp_reader *pfile;
+ cpp_toklist *list;
+{
+ 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;
+
+ if (!(list->flags & LIST_OFFSET))
+ (abort) ();
+
+ 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;)
+ {
+ 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))
{
- case EOF:
- cpp_error_with_line (pfile, start_line, start_column,
- "unterminated string or character constant");
- if (pfile->multiline_string_line != start_line
- && pfile->multiline_string_line != 0)
- cpp_error_with_line (pfile,
- pfile->multiline_string_line, -1,
- "possible real start of unterminated constant");
- pfile->multiline_string_line = 0;
- goto out;
+ 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;
+ }
+ 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;
+
+ switch (c)
+ {
+ 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++] = '.';
+ }
- case '\0':
- null_count++;
+ 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;
-
- case '\n':
- CPP_BUMP_LINE (pfile);
- /* In Fortran and assembly language, silently terminate
- strings of either variety at end of line. This is a
- kludge around not knowing where comments are in these
- languages. */
- if (CPP_OPTION (pfile, lang_fortran)
- || CPP_OPTION (pfile, lang_asm))
+
+ 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. */
+ 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;
+
+ case '\'':
+ case '\"':
+ cur_token->type = c == '\'' ? CPP_CHAR : CPP_STRING;
+ /* Do we have a wide string? */
+ if (cur_token[-1].type == CPP_NAME && IMMED_TOKEN ()
+ && cur_token[-1].val.node == pfile->spec_nodes->n_L)
+ BACKUP_TOKEN (c == '\'' ? CPP_WCHAR : CPP_WSTRING);
+
+ 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;
+
+ case '/':
+ cur_token->type = CPP_DIV;
+ if (IMMED_TOKEN ())
{
- FORWARD(-1);
- goto out;
+ 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;
+ }
+ }
}
- /* Character constants may not extend over multiple lines.
- In Standard C, neither may strings. We accept multiline
- strings as an extension. */
- if (c == '\'')
+ cur_token++;
+ break;
+
+ case '*':
+ cur_token->type = CPP_MULT;
+ if (IMMED_TOKEN ())
{
- cpp_error_with_line (pfile, start_line, start_column,
- "unterminated character constant");
- FORWARD(-1);
- goto out;
+ 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);
+ }
}
- if (CPP_PEDANTIC (pfile) && pfile->multiline_string_line == 0)
- cpp_pedwarn_with_line (pfile, start_line, start_column,
- "string constant runs past end of line");
- if (pfile->multiline_string_line == 0)
- pfile->multiline_string_line = start_line;
+ cur_token++;
break;
+ case '\n':
case '\r':
- if (CPP_BUFFER (pfile)->has_escapes)
+ handle_newline (cur, buffer->rlimit, c);
+ if (PREV_TOKEN_TYPE == CPP_BACKSLASH)
+ {
+ if (IMMED_TOKEN ())
+ {
+ /* 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;
+ break;
+ }
+ else
+ {
+ buffer->cur = cur;
+ cpp_warning (pfile,
+ "backslash and newline separated by space");
+ }
+ }
+ else if (MIGHT_BE_DIRECTIVE ())
{
- cpp_ice (pfile, "\\r escape inside string constant");
- FORWARD(1);
+ /* "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");
}
+
+ /* 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;
+
+ case '-':
+ if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_MINUS)
+ REVISE_TOKEN (CPP_MINUS_MINUS);
else
- /* Backslash newline is replaced by nothing at all. */
- CPP_BUMP_LINE (pfile);
+ PUSH_TOKEN (CPP_MINUS);
break;
- case '\\':
- FORWARD(1);
+ 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;
- case '\"':
- case '\'':
- if (cc == c)
- goto out;
+ 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;
+
+ case '&':
+ if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_AND)
+ REVISE_TOKEN (CPP_AND_AND);
+ else
+ PUSH_TOKEN (CPP_AND);
+ break;
+
+ make_or:
+ case '|':
+ if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_OR)
+ REVISE_TOKEN (CPP_OR_OR);
+ else
+ PUSH_TOKEN (CPP_OR);
+ break;
+
+ case '+':
+ if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_PLUS)
+ REVISE_TOKEN (CPP_PLUS_PLUS);
+ else
+ PUSH_TOKEN (CPP_PLUS);
+ break;
+
+ 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;
+
+ case '>':
+ cur_token->type = CPP_GREATER;
+ if (IMMED_TOKEN ())
+ {
+ 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))
+ {
+ /* 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);
+ }
+ }
+ 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;
+
+ 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;
+
+ case '?':
+ if (cur + 1 < buffer->rlimit && *cur == '?'
+ && 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;
+
+ case '.':
+ if (PREV_TOKEN_TYPE == CPP_DOT && cur_token[-2].type == CPP_DOT
+ && IMMED_TOKEN ()
+ && !(cur_token[-1].flags & PREV_WHITE))
+ {
+ cur_token -= 2;
+ PUSH_TOKEN (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;
}
}
+ /* Run out of token space? */
+ if (cur_token == token_limit)
+ {
+ list->tokens_used = cur_token - list->tokens;
+ _cpp_expand_token_space (list, 256);
+ goto expanded;
+ }
+
+ cur_token->flags = flags;
+ if (cur_token == &list->tokens[first_token] && pfile->done_initializing)
+ {
+ if (cur > buffer->buf && !is_vspace (cur[-1]))
+ cpp_pedwarn_with_line (pfile, CPP_BUF_LINE (buffer),
+ CPP_BUF_COLUMN (buffer, cur),
+ "no newline at end of file");
+ cur_token++->type = CPP_EOF;
+ }
+
out:
- if (null_count == 1)
- cpp_warning (pfile, "null character in string or character constant");
- else if (null_count > 1)
- cpp_warning (pfile, "null characters in string or character constant");
-}
+ /* All tokens are allocated, so the memory location is fixed. */
+ first = &list->tokens[first_token];
+
+ /* 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");
+ }
+
+ /* 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;
+ }
+
+ 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;
-/* Parse a string and copy it to the output. */
+ buffer->cur = cur;
+ list->tokens_used = cur_token - list->tokens;
+ pfile->in_lex_line = 0;
+}
+/* Write the spelling of a token TOKEN, with any appropriate
+ whitespace before it, to the token_buffer. 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. */
static void
-parse_string (pfile, c)
+output_token (pfile, token, prev)
cpp_reader *pfile;
- int c;
+ const cpp_token *token, *prev;
{
- const U_CHAR *start = CPP_BUFFER (pfile)->cur; /* XXX Layering violation */
- const U_CHAR *limit;
+ int dummy;
- skip_string (pfile, c);
+ if (token->col && (token->flags & BOL))
+ {
+ /* 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 char *buffer;
+ unsigned int spaces = token->col - 1;
+
+ CPP_RESERVE (pfile, token->col);
+ buffer = pfile->limit;
+
+ while (spaces--)
+ *buffer++ = ' ';
+ pfile->limit = buffer;
+ }
+ else if (token->flags & PREV_WHITE)
+ CPP_PUTC (pfile, ' ');
+ else if (prev)
+ {
+ /* Check for and prevent accidental token pasting. */
+ if (can_paste (pfile, prev, token, &dummy) != CPP_EOF)
+ CPP_PUTC (pfile, ' ');
+ /* can_paste doesn't catch all the accidental pastes.
+ Consider a + ++b - if there is not a space between the + and ++, it
+ will be misparsed as a++ + b. */
+ else if ((prev->type == CPP_PLUS && token->type == CPP_PLUS_PLUS)
+ || (prev->type == CPP_MINUS && token->type == CPP_MINUS_MINUS))
+ CPP_PUTC (pfile, ' ');
+ }
- limit = CPP_BUFFER (pfile)->cur;
- CPP_RESERVE (pfile, limit - start + 2);
- CPP_PUTC_Q (pfile, c);
- for (; start < limit; start++)
- if (*start != '\r')
- CPP_PUTC_Q (pfile, *start);
+ CPP_RESERVE (pfile, TOKEN_LEN (token));
+ pfile->limit = spell_token (pfile, token, pfile->limit);
}
-/* Read an assertion into the token buffer, converting to
- canonical form: `#predicate(a n swe r)' The next non-whitespace
- character to read should be the first letter of the predicate.
- Returns 0 for syntax error, 1 for bare predicate, 2 for predicate
- with answer (see callers for why). In case of 0, an error has been
- printed. */
-int
-_cpp_parse_assertion (pfile)
- cpp_reader *pfile;
+/* 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. */
+
+static unsigned char *
+spell_token (pfile, token, buffer)
+ cpp_reader *pfile; /* Would be nice to be rid of this... */
+ const cpp_token *token;
+ unsigned char *buffer;
{
- int c, dropwhite;
- _cpp_skip_hspace (pfile);
- c = PEEKC();
- if (c == '\n')
+ switch (TOKEN_SPELL (token))
{
- cpp_error (pfile, "assertion without predicate");
- return 0;
+ case SPELL_OPERATOR:
+ {
+ const unsigned char *spelling;
+ unsigned char c;
+
+ 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);
+
+ while ((c = *spelling++) != '\0')
+ *buffer++ = c;
+ }
+ break;
+
+ case SPELL_IDENT:
+ spell_ident:
+ memcpy (buffer, token->val.node->name, token->val.node->length);
+ buffer += token->val.node->length;
+ break;
+
+ case SPELL_STRING:
+ {
+ if (token->type == CPP_WSTRING || token->type == CPP_WCHAR)
+ *buffer++ = 'L';
+
+ if (token->type == CPP_STRING || token->type == CPP_WSTRING)
+ *buffer++ = '"';
+ if (token->type == CPP_CHAR || token->type == CPP_WCHAR)
+ *buffer++ = '\'';
+
+ memcpy (buffer, token->val.str.text, token->val.str.len);
+ buffer += token->val.str.len;
+
+ if (token->type == CPP_STRING || token->type == CPP_WSTRING)
+ *buffer++ = '"';
+ if (token->type == CPP_CHAR || token->type == CPP_WCHAR)
+ *buffer++ = '\'';
+ }
+ break;
+
+ case SPELL_CHAR:
+ *buffer++ = token->val.aux;
+ break;
+
+ case SPELL_NONE:
+ cpp_ice (pfile, "Unspellable token %s", TOKEN_NAME (token));
+ break;
}
- else if (! is_idstart(c))
+
+ return buffer;
+}
+
+/* Macro expansion algorithm.
+
+Macro expansion is implemented by a single-pass algorithm; there are
+no rescan passes involved. cpp_get_token expands just enough to be
+able to return a token to the caller, a consequence is that when it
+returns the preprocessor can be in a state of mid-expansion. The
+algorithm does not work by fully expanding a macro invocation into
+some kind of token list, and then returning them one by one.
+
+Our expansion state is recorded in a context stack. We start out with
+a single context on the stack, let's call it base context. This
+consists of the token list returned by lex_line that forms the next
+logical line in the source file.
+
+The current level in the context stack is stored in the cur_context
+member of the cpp_reader structure. The context it references keeps,
+amongst other things, a count of how many tokens form that context and
+our position within those tokens.
+
+Fundamentally, calling cpp_get_token will return the next token from
+the current context. If we're at the end of the current context, that
+context is popped from the stack first, unless it is the base context,
+in which case the next logical line is lexed from the source file.
+
+However, before returning the token, if it is a CPP_NAME token
+_cpp_get_token checks to see if it is a macro and if it is enabled.
+Each time it encounters a macro name, it calls push_macro_context.
+This function checks that the macro should be expanded (with
+is_macro_enabled), and if so pushes a new macro context on the stack
+which becomes the current context. It then loops back to read the
+first token of the macro context.
+
+A macro context basically consists of the token list representing the
+macro's replacement list, which was saved in the hash table by
+save_macro_expansion when its #define statement was parsed. If the
+macro is function-like, it also contains the tokens that form the
+arguments to the macro. I say more about macro arguments below, but
+for now just saying that each argument is a set of pointers to tokens
+is enough.
+
+When taking tokens from a macro context, we may get a CPP_MACRO_ARG
+token. This represents an argument passed to the macro, with the
+argument number stored in the token's AUX field. The argument should
+be substituted, this is achieved by pushing an "argument context". An
+argument context is just refers to the tokens forming the argument,
+which are obtained directly from the macro context. The STRINGIFY
+flag on a CPP_MACRO_ARG token indicates that the argument should be
+stringified.
+
+Here's a few simple rules the context stack obeys:-
+
+ 1) The lex_line token list is always context zero.
+
+ 2) Context 1, if it exists, must be a macro context.
+
+ 3) An argument context can only appear above a macro context.
+
+ 4) A macro context can appear above the base context, another macro
+ context, or an argument context.
+
+ 5) These imply that the minimal level of an argument context is 2.
+
+The only tricky thing left is ensuring that macros are enabled and
+disabled correctly. The algorithm controls macro expansion by the
+level of the context a token is taken from in the context stack. If a
+token is taken from a level equal to no_expand_level (a member of
+struct cpp_reader), no expansion is performed.
+
+When popping a context off the stack, if no_expand_level equals the
+level of the popped context, it is reduced by one to match the new
+context level, so that expansion is still disabled. It does not
+increase if a context is pushed, though. It starts out life as
+UINT_MAX, which has the effect that initially macro expansion is
+enabled. I explain how this mechanism works below.
+
+The standard requires:-
+
+ 1) Arguments to be fully expanded before substitution.
+
+ 2) Stringified arguments to not be expanded, nor the tokens
+ immediately surrounding a ## operator.
+
+ 3) Continual rescanning until there are no more macros left to
+ replace.
+
+ 4) Once a macro has been expanded in stage 1) or 3), it cannot be
+ expanded again during later rescans. This prevents infinite
+ recursion.
+
+The first thing to observe is that stage 3) is mostly redundant.
+Since a macro is disabled once it has been expanded, how can a rescan
+find an unexpanded macro name? There are only two cases where this is
+possible:-
+
+ a) If the macro name results from a token paste operation.
+
+ b) If the macro in question is a function-like macro that hasn't
+ already been expanded because previously there was not the required
+ '(' token immediately following it. This is only possible when an
+ argument is substituted, and after substitution the last token of
+ the argument can bind with a parenthesis appearing in the tokens
+ following the substitution. Note that if the '(' appears within the
+ argument, the ')' must too, as expanding macro arguments cannot
+ "suck in" tokens outside the argument.
+
+So we tackle this as follows. When parsing the macro invocation for
+arguments, we record the tokens forming each argument as a list of
+pointers to those tokens. We do not expand any tokens that are "raw",
+i.e. directly from the macro invocation, but other tokens that come
+from (nested) argument substitution are fully expanded.
+
+This is achieved by setting the no_expand_level to that of the macro
+invocation. A CPP_MACRO_ARG token never appears in the list of tokens
+forming an argument, because parse_args (indirectly) calls
+get_raw_token which automatically pushes argument contexts and traces
+into them. Since these contexts are at a higher level than the
+no_expand_level, they get fully macro expanded.
+
+"Raw" and non-raw tokens are separated in arguments by null pointers,
+with the policy that the initial state of an argument is raw. If the
+first token is not raw, it should be preceded by a null pointer. When
+tracing through the tokens of an argument context, each time
+get_raw_token encounters a null pointer, it toggles the flag
+CONTEXT_RAW.
+
+This flag, when set, indicates to is_macro_disabled that we are
+reading raw tokens which should be macro-expanded. Similarly, if
+clear, is_macro_disabled suppresses re-expansion.
+
+It's probably time for an example.
+
+#define hash #
+#define str(x) #x
+#define xstr(y) str(y hash)
+str(hash) // "hash"
+xstr(hash) // "# hash"
+
+In the invocation of str, parse_args turns off macro expansion and so
+parses the argument as <hash>. This is the only token (pointer)
+passed as the argument to str. Since <hash> is raw there is no need
+for an initial null pointer. stringify_arg is called from
+get_raw_token when tracing through the expansion of str, since the
+argument has the STRINGIFY flag set. stringify_arg turns off
+macro_expansion by setting the no_expand_level to that of the argument
+context. Thus it gets the token <hash> and stringifies it to "hash"
+correctly.
+
+Similary xstr is passed <hash>. However, when parse_args is parsing
+the invocation of str() in xstr's expansion, get_raw_token encounters
+a CPP_MACRO_ARG token for y. Transparently to parse_args, it pushes
+an argument context, and enters the tokens of the argument,
+i.e. <hash>. This is at a higher context level than parse_args
+disabled, and so is_macro_disabled permits expansion of it and a macro
+context is pushed on top of the argument context. This contains the
+<#> token, and the end result is that <hash> is macro expanded.
+However, after popping off the argument context, the <hash> of xstr's
+expansion does not get macro expanded because we're back at the
+no_expand_level. The end result is that the argument passed to str is
+<NULL> <#> <NULL> <hash>. Note the nulls - policy is we start off
+raw, <#> is not raw, but then <hash> is.
+
+*/
+
+
+/* Free the storage allocated for macro arguments. */
+static void
+free_macro_args (args)
+ macro_args *args;
+{
+ if (args->tokens)
+ free ((PTR) args->tokens);
+ free (args->ends);
+ free (args);
+}
+
+/* Determines if a macro has been already used (and is therefore
+ disabled). */
+static int
+is_macro_disabled (pfile, expansion, token)
+ cpp_reader *pfile;
+ const cpp_toklist *expansion;
+ const cpp_token *token;
+{
+ cpp_context *context = CURRENT_CONTEXT (pfile);
+
+ /* Don't expand anything if this file has already been preprocessed. */
+ if (CPP_OPTION (pfile, preprocessed))
+ return 1;
+
+ /* Arguments on either side of ## are inserted in place without
+ macro expansion (6.10.3.3.2). Conceptually, any macro expansion
+ occurs during a later rescan pass. The effect is that we expand
+ iff we would as part of the macro's expansion list, so we should
+ drop to the macro's context. */
+ if (IS_ARG_CONTEXT (context))
{
- cpp_error (pfile, "assertion predicate is not an identifier");
- return 0;
+ if (token->flags & PASTED)
+ context--;
+ else if (!(context->flags & CONTEXT_RAW))
+ return 1;
+ else if (context->flags & (CONTEXT_PASTEL | CONTEXT_PASTER))
+ context--;
}
- CPP_PUTC(pfile, '#');
- FORWARD(1);
- _cpp_parse_name (pfile, c);
- c = PEEKC();
- if (c != '(')
+ /* Have we already used this macro? */
+ while (context->level > 0)
{
- if (is_hspace(c) || c == '\r')
- _cpp_skip_hspace (pfile);
- c = PEEKC();
+ if (!IS_ARG_CONTEXT (context) && context->u.list == expansion)
+ return 1;
+ /* Raw argument tokens are judged based on the token list they
+ came from. */
+ if (context->flags & CONTEXT_RAW)
+ context = pfile->contexts + context->level;
+ else
+ context--;
}
- if (c != '(')
- return 1;
- CPP_PUTC(pfile, '(');
- FORWARD(1);
- dropwhite = 1;
- while ((c = GETC()) != ')')
+ /* Function-like macros may be disabled if the '(' is not in the
+ current context. We check this without disrupting the context
+ stack. */
+ if (expansion->paramc >= 0)
{
- if (is_space(c))
+ const cpp_token *next;
+ unsigned int prev_nme;
+
+ context = CURRENT_CONTEXT (pfile);
+ /* Drop down any contexts we're at the end of: the '(' may
+ appear in lower macro expansions, or in the rest of the file. */
+ while (context->posn == context->count && context > pfile->contexts)
{
- if (! dropwhite)
- {
- CPP_PUTC(pfile, ' ');
- dropwhite = 1;
- }
+ context--;
+ /* If we matched, we are disabled, as we appear in the
+ expansion of each macro we meet. */
+ if (!IS_ARG_CONTEXT (context) && context->u.list == expansion)
+ return 1;
}
- else if (c == '\n' || c == EOF)
+
+ prev_nme = pfile->no_expand_level;
+ pfile->no_expand_level = context - pfile->contexts;
+ next = _cpp_get_token (pfile);
+ restore_macro_expansion (pfile, prev_nme);
+ if (next->type != CPP_OPEN_PAREN)
{
- if (c == '\n') FORWARD(-1);
- cpp_error (pfile, "un-terminated assertion answer");
- return 0;
+ _cpp_push_token (pfile, next);
+ if (CPP_WTRADITIONAL (pfile))
+ cpp_warning (pfile,
+ "function macro %s must be used with arguments in traditional C",
+ token->val.node->name);
+ return 1;
}
- else if (c == '\r')
- /* \r cannot be a macro escape here. */
- CPP_BUMP_LINE (pfile);
- else
+ }
+
+ return 0;
+}
+
+/* Add a token to the set of tokens forming the arguments to the macro
+ being parsed in parse_args. */
+static void
+save_token (args, token)
+ macro_args *args;
+ const cpp_token *token;
+{
+ if (args->used == args->capacity)
+ {
+ args->capacity += args->capacity + 100;
+ args->tokens = (const cpp_token **)
+ xrealloc ((PTR) args->tokens,
+ args->capacity * sizeof (const cpp_token *));
+ }
+ args->tokens[args->used++] = token;
+}
+
+/* Take and save raw tokens until we finish one argument. Empty
+ arguments are saved as a single CPP_PLACEMARKER token. */
+static const cpp_token *
+parse_arg (pfile, var_args, paren_context, args, pcount)
+ cpp_reader *pfile;
+ int var_args;
+ unsigned int paren_context;
+ macro_args *args;
+ unsigned int *pcount;
+{
+ const cpp_token *token;
+ unsigned int paren = 0, count = 0;
+ int raw, was_raw = 1;
+
+ for (count = 0;; count++)
+ {
+ token = _cpp_get_token (pfile);
+
+ switch (token->type)
+ {
+ default:
+ break;
+
+ case CPP_OPEN_PAREN:
+ paren++;
+ break;
+
+ case CPP_CLOSE_PAREN:
+ if (paren-- != 0)
+ break;
+ goto out;
+
+ case CPP_COMMA:
+ /* Commas are not terminators within parantheses or var_args. */
+ if (paren || var_args)
+ break;
+ goto out;
+
+ case CPP_EOF: /* Error reported by caller. */
+ goto out;
+ }
+
+ raw = pfile->cur_context <= paren_context;
+ if (raw != was_raw)
{
- CPP_PUTC (pfile, c);
- dropwhite = 0;
+ was_raw = raw;
+ save_token (args, 0);
+ count++;
}
+ save_token (args, token);
}
- if (pfile->limit[-1] == ' ')
- pfile->limit[-1] = ')';
- else if (pfile->limit[-1] == '(')
+ out:
+ if (count == 0)
{
- cpp_error (pfile, "empty token sequence in assertion");
- return 0;
+ /* Duplicate the placemarker. Then we can set its flags and
+ position and safely be using more than one. */
+ save_token (args, duplicate_token (pfile, &placemarker_token));
+ count++;
}
- else
- CPP_PUTC (pfile, ')');
- return 2;
+ *pcount = count;
+ return token;
}
-/* Get the next token, and add it to the text in pfile->token_buffer.
- Return the kind of token we got. */
+/* This macro returns true if the argument starting at offset O of arglist
+ A is empty - that is, it's either a single PLACEMARKER token, or a null
+ pointer followed by a PLACEMARKER. */
-enum cpp_token
-_cpp_lex_token (pfile)
+#define empty_argument(A, O) \
+ ((A)->tokens[O] ? (A)->tokens[O]->type == CPP_PLACEMARKER \
+ : (A)->tokens[(O)+1]->type == CPP_PLACEMARKER)
+
+/* Parse the arguments making up a macro invocation. Nested arguments
+ are automatically macro expanded, but immediate macros are not
+ expanded; this enables e.g. operator # to work correctly. Returns
+ non-zero on error. */
+static int
+parse_args (pfile, hp, args)
cpp_reader *pfile;
+ cpp_hashnode *hp;
+ macro_args *args;
{
- register int c, c2, c3;
- enum cpp_token token;
-
- get_next:
- c = GETC();
- switch (c)
+ const cpp_token *token;
+ const cpp_toklist *macro;
+ unsigned int total = 0;
+ unsigned int paren_context = pfile->cur_context;
+ int argc = 0;
+
+ macro = hp->value.expansion;
+ do
{
- case EOF:
- return CPP_EOF;
+ unsigned int count;
- case '/':
- if (PEEKC () == '=')
- goto op2;
+ token = parse_arg (pfile, (argc + 1 == macro->paramc
+ && (macro->flags & VAR_ARGS)),
+ paren_context, args, &count);
+ if (argc < macro->paramc)
+ {
+ total += count;
+ args->ends[argc] = total;
+ }
+ argc++;
+ }
+ while (token->type != CPP_CLOSE_PAREN && token->type != CPP_EOF);
- comment:
- if (CPP_OPTION (pfile, discard_comments))
- c = skip_comment (pfile, c);
- else
- c = copy_comment (pfile, c);
- if (c != ' ')
- goto randomchar;
-
- /* Comments are equivalent to spaces.
- For -traditional, a comment is equivalent to nothing. */
- if (!CPP_OPTION (pfile, discard_comments))
- return CPP_COMMENT;
- else if (CPP_TRADITIONAL (pfile)
- && ! is_space (PEEKC ()))
+ if (token->type == CPP_EOF)
+ {
+ cpp_error(pfile, "unterminated argument list for macro \"%s\"", hp->name);
+ return 1;
+ }
+ else if (argc < macro->paramc)
+ {
+ /* A rest argument is allowed to not appear in the invocation at all.
+ e.g. #define debug(format, args...) ...
+ debug("string");
+ This is exactly the same as if the rest argument had received no
+ tokens - debug("string",); This extension is deprecated. */
+
+ if (argc + 1 == macro->paramc && (macro->flags & VAR_ARGS))
{
- if (pfile->parsing_define_directive)
- return CPP_COMMENT;
- else
- goto get_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);
+ args->ends[argc] = total + 1;
+
+ if (CPP_OPTION (pfile, c99) && CPP_PEDANTIC (pfile))
+ cpp_pedwarn (pfile, "ISO C99 requires rest arguments to be used");
+
+ return 0;
}
else
{
- CPP_PUTC (pfile, c);
- return CPP_HSPACE;
+ cpp_error (pfile, "not enough arguments for macro \"%s\"", hp->name);
+ return 1;
}
+ }
+ /* An empty argument to an empty function-like macro is fine. */
+ 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);
+ return 1;
+ }
- case '#':
- if (pfile->parsing_if_directive)
- {
- if (_cpp_parse_assertion (pfile))
- return CPP_ASSERTION;
- goto randomchar;
- }
+ return 0;
+}
- if (pfile->parsing_define_directive && ! CPP_TRADITIONAL (pfile))
- {
- CPP_RESERVE (pfile, 3);
- CPP_PUTC_Q (pfile, '#');
- CPP_NUL_TERMINATE_Q (pfile);
- if (PEEKC () != '#')
- return CPP_STRINGIZE;
-
- FORWARD (1);
- CPP_PUTC_Q (pfile, '#');
- CPP_NUL_TERMINATE_Q (pfile);
- return CPP_TOKPASTE;
- }
+/* Adds backslashes before all backslashes and double quotes appearing
+ in strings. Non-printable characters are converted to octal. */
+static U_CHAR *
+quote_string (dest, src, len)
+ U_CHAR *dest;
+ const U_CHAR *src;
+ unsigned int len;
+{
+ while (len--)
+ {
+ U_CHAR c = *src++;
- if (!pfile->only_seen_white)
- goto randomchar;
- return CPP_DIRECTIVE;
-
- case '\"':
- case '\'':
- parse_string (pfile, c);
- return c == '\'' ? CPP_CHAR : CPP_STRING;
-
- case '$':
- if (!CPP_OPTION (pfile, dollars_in_ident))
- goto randomchar;
- goto letter;
-
- case ':':
- if (CPP_OPTION (pfile, cplusplus) && PEEKC () == ':')
- goto op2;
- goto randomchar;
-
- case '&':
- case '+':
- case '|':
- c2 = PEEKC ();
- if (c2 == c || c2 == '=')
- goto op2;
- goto randomchar;
-
- case '*':
- case '!':
- case '%':
- case '=':
- case '^':
- if (PEEKC () == '=')
- goto op2;
- goto randomchar;
-
- case '-':
- c2 = PEEKC ();
- if (c2 == '-')
+ if (c == '\\' || c == '"')
{
- if (CPP_OPTION (pfile, chill))
- goto comment; /* Chill style comment */
- else
- goto op2;
+ *dest++ = '\\';
+ *dest++ = c;
}
- else if (c2 == '=')
- goto op2;
- else if (c2 == '>')
+ else
{
- if (CPP_OPTION (pfile, cplusplus) && PEEKN (1) == '*')
+ if (ISPRINT (c))
+ *dest++ = c;
+ else
{
- /* In C++, there's a ->* operator. */
- token = CPP_OTHER;
- CPP_RESERVE (pfile, 4);
- CPP_PUTC_Q (pfile, c);
- CPP_PUTC_Q (pfile, GETC ());
- CPP_PUTC_Q (pfile, GETC ());
- CPP_NUL_TERMINATE_Q (pfile);
- return token;
+ sprintf ((char *) dest, "\\%03o", c);
+ dest += 4;
}
- goto op2;
}
- goto randomchar;
+ }
+
+ return dest;
+}
+
+/* Allocates a buffer to hold a token's TEXT, and converts TOKEN to a
+ CPP_STRING token containing TEXT in quoted form. */
+static cpp_token *
+make_string_token (token, text, len)
+ cpp_token *token;
+ const U_CHAR *text;
+ unsigned int len;
+{
+ U_CHAR *buf;
+
+ buf = (U_CHAR *) xmalloc (len * 4);
+ token->type = CPP_STRING;
+ token->flags = 0;
+ token->val.str.text = buf;
+ token->val.str.len = quote_string (buf, text, len) - buf;
+ return token;
+}
+
+/* Allocates and converts a temporary token to a CPP_NUMBER token,
+ evaluating to NUMBER. */
+static cpp_token *
+alloc_number_token (pfile, number)
+ cpp_reader *pfile;
+ int number;
+{
+ cpp_token *result;
+ char *buf;
+
+ result = get_temp_token (pfile);
+ buf = xmalloc (20);
+ sprintf (buf, "%d", number);
+
+ result->type = CPP_NUMBER;
+ result->flags = 0;
+ result->val.str.text = (U_CHAR *) buf;
+ result->val.str.len = strlen (buf);
+ return result;
+}
- case '<':
- if (pfile->parsing_include_directive)
+/* Returns a temporary token from the temporary token store of PFILE. */
+static cpp_token *
+get_temp_token (pfile)
+ cpp_reader *pfile;
+{
+ if (pfile->temp_used == pfile->temp_alloced)
+ {
+ if (pfile->temp_used == pfile->temp_cap)
{
- for (;;)
- {
- CPP_PUTC (pfile, c);
- if (c == '>')
- break;
- c = GETC ();
- if (c == '\n' || c == EOF)
- {
- cpp_error (pfile,
- "missing '>' in `#include <FILENAME>'");
- break;
- }
- else if (c == '\r')
- {
- if (!CPP_BUFFER (pfile)->has_escapes)
- {
- /* Backslash newline is replaced by nothing. */
- CPP_ADJUST_WRITTEN (pfile, -1);
- CPP_BUMP_LINE (pfile);
- }
- else
- {
- /* We might conceivably get \r- or \r<space> in
- here. Just delete 'em. */
- int d = GETC();
- if (d != '-' && d != ' ')
- cpp_ice (pfile, "unrecognized escape \\r%c", d);
- CPP_ADJUST_WRITTEN (pfile, -1);
- }
- }
- }
- return CPP_STRING;
+ pfile->temp_cap += pfile->temp_cap + 20;
+ pfile->temp_tokens = (cpp_token **) xrealloc
+ (pfile->temp_tokens, pfile->temp_cap * sizeof (cpp_token *));
}
- /* else fall through */
- case '>':
- c2 = PEEKC ();
- if (c2 == '=')
- goto op2;
- /* GNU C++ supports MIN and MAX operators <? and >?. */
- if (c2 != c && (!CPP_OPTION (pfile, cplusplus) || c2 != '?'))
- goto randomchar;
- FORWARD(1);
- CPP_RESERVE (pfile, 4);
- CPP_PUTC (pfile, c);
- CPP_PUTC (pfile, c2);
- c3 = PEEKC ();
- if (c3 == '=')
- CPP_PUTC_Q (pfile, GETC ());
- CPP_NUL_TERMINATE_Q (pfile);
- return CPP_OTHER;
-
- case '.':
- c2 = PEEKC ();
- if (ISDIGIT(c2))
+ pfile->temp_tokens[pfile->temp_alloced++] = (cpp_token *) xmalloc
+ (sizeof (cpp_token));
+ }
+
+ return pfile->temp_tokens[pfile->temp_used++];
+}
+
+/* Release (not free) for re-use the temporary tokens of PFILE. */
+static void
+release_temp_tokens (pfile)
+ cpp_reader *pfile;
+{
+ while (pfile->temp_used)
+ {
+ cpp_token *token = pfile->temp_tokens[--pfile->temp_used];
+
+ if (TOKEN_SPELL (token) == SPELL_STRING)
{
- CPP_RESERVE(pfile, 2);
- CPP_PUTC_Q (pfile, '.');
- c = GETC ();
- goto number;
+ free ((char *) token->val.str.text);
+ token->val.str.text = 0;
}
+ }
+}
+
+/* Free all of PFILE's dynamically-allocated temporary tokens. */
+void
+_cpp_free_temp_tokens (pfile)
+ cpp_reader *pfile;
+{
+ if (pfile->temp_tokens)
+ {
+ /* It is possible, though unlikely (looking for '(' of a funlike
+ macro into EOF), that we haven't released the tokens yet. */
+ release_temp_tokens (pfile);
+ while (pfile->temp_alloced)
+ free (pfile->temp_tokens[--pfile->temp_alloced]);
+ free (pfile->temp_tokens);
+ }
+
+ if (pfile->date)
+ {
+ free ((char *) pfile->date->val.str.text);
+ free (pfile->date);
+ free ((char *) pfile->time->val.str.text);
+ free (pfile->time);
+ }
+}
+
+/* Copy TOKEN into a temporary token from PFILE's store. */
+static cpp_token *
+duplicate_token (pfile, token)
+ cpp_reader *pfile;
+ const cpp_token *token;
+{
+ cpp_token *result = get_temp_token (pfile);
+
+ *result = *token;
+ if (TOKEN_SPELL (token) == SPELL_STRING)
+ {
+ U_CHAR *buff = (U_CHAR *) xmalloc (token->val.str.len);
+ memcpy (buff, token->val.str.text, token->val.str.len);
+ result->val.str.text = buff;
+ }
+ return result;
+}
+
+/* Determine whether two tokens can be pasted together, and if so,
+ 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)
+ cpp_reader * pfile;
+ const cpp_token *token1, *token2;
+ int* digraph;
+{
+ enum cpp_ttype a = token1->type, b = token2->type;
+ int cxx = CPP_OPTION (pfile, cplusplus);
+
+ /* Treat named operators as if they were ordinary NAMEs. */
+ if (token1->flags & NAMED_OP)
+ a = CPP_NAME;
+ if (token2->flags & NAMED_OP)
+ b = CPP_NAME;
- /* In C++ there's a .* operator. */
- if (CPP_OPTION (pfile, cplusplus) && c2 == '*')
- goto op2;
+ if (a <= CPP_LAST_EQ && b == CPP_EQ)
+ return a + (CPP_EQ_EQ - CPP_EQ);
- if (c2 == '.' && PEEKN(1) == '.')
+ switch (a)
+ {
+ case CPP_GREATER:
+ if (b == a) return CPP_RSHIFT;
+ if (b == CPP_QUERY && cxx) return CPP_MAX;
+ if (b == CPP_GREATER_EQ) return CPP_RSHIFT_EQ;
+ break;
+ case CPP_LESS:
+ if (b == a) return CPP_LSHIFT;
+ if (b == CPP_QUERY && cxx) return CPP_MIN;
+ if (b == CPP_LESS_EQ) return CPP_LSHIFT_EQ;
+ if (CPP_OPTION (pfile, digraphs))
{
- CPP_RESERVE(pfile, 4);
- CPP_PUTC_Q (pfile, '.');
- CPP_PUTC_Q (pfile, '.');
- CPP_PUTC_Q (pfile, '.');
- FORWARD (2);
- CPP_NUL_TERMINATE_Q (pfile);
- return CPP_3DOTS;
+ if (b == CPP_COLON)
+ {*digraph = 1; return CPP_OPEN_SQUARE;} /* <: digraph */
+ if (b == CPP_MOD)
+ {*digraph = 1; return CPP_OPEN_BRACE;} /* <% digraph */
}
- goto randomchar;
-
- op2:
- token = CPP_OTHER;
- CPP_RESERVE(pfile, 3);
- CPP_PUTC_Q (pfile, c);
- CPP_PUTC_Q (pfile, GETC ());
- CPP_NUL_TERMINATE_Q (pfile);
- return token;
-
- case 'L':
- c2 = PEEKC ();
- if ((c2 == '\'' || c2 == '\"') && !CPP_TRADITIONAL (pfile))
+ break;
+
+ case CPP_PLUS: if (b == a) return CPP_PLUS_PLUS; break;
+ case CPP_AND: if (b == a) return CPP_AND_AND; break;
+ case CPP_OR: if (b == a) return CPP_OR_OR; break;
+
+ case CPP_MINUS:
+ if (b == a) return CPP_MINUS_MINUS;
+ if (b == CPP_GREATER) return CPP_DEREF;
+ break;
+ case CPP_COLON:
+ if (b == a && cxx) return CPP_SCOPE;
+ if (b == CPP_GREATER && CPP_OPTION (pfile, digraphs))
+ {*digraph = 1; return CPP_CLOSE_SQUARE;} /* :> digraph */
+ break;
+
+ case CPP_MOD:
+ if (CPP_OPTION (pfile, digraphs))
{
- CPP_PUTC (pfile, c);
- c = GETC ();
- parse_string (pfile, c);
- return c == '\'' ? CPP_WCHAR : CPP_WSTRING;
+ if (b == CPP_GREATER)
+ {*digraph = 1; return CPP_CLOSE_BRACE;} /* %> digraph */
+ if (b == CPP_COLON)
+ {*digraph = 1; return CPP_HASH;} /* %: digraph */
}
- goto letter;
+ break;
+ case CPP_DEREF:
+ if (b == CPP_MULT && cxx) return CPP_DEREF_STAR;
+ break;
+ case CPP_DOT:
+ if (b == CPP_MULT && cxx) return CPP_DOT_STAR;
+ if (b == CPP_NUMBER) return CPP_NUMBER;
+ break;
+
+ case CPP_HASH:
+ if (b == a && (token1->flags & DIGRAPH) == (token2->flags & DIGRAPH))
+ /* %:%: digraph */
+ {*digraph = (token1->flags & DIGRAPH); return CPP_PASTE;}
+ break;
+
+ case CPP_NAME:
+ if (b == CPP_NAME) return CPP_NAME;
+ if (b == CPP_NUMBER
+ && is_numstart(token2->val.str.text[0])) return CPP_NAME;
+ if (b == CPP_CHAR
+ && token1->val.node == pfile->spec_nodes->n_L) return CPP_WCHAR;
+ if (b == CPP_STRING
+ && token1->val.node == pfile->spec_nodes->n_L) return CPP_WSTRING;
+ break;
+
+ case CPP_NUMBER:
+ if (b == CPP_NUMBER) return CPP_NUMBER;
+ if (b == CPP_NAME) return CPP_NUMBER;
+ if (b == CPP_DOT) return CPP_NUMBER;
+ /* Numbers cannot have length zero, so this is safe. */
+ if ((b == CPP_PLUS || b == CPP_MINUS)
+ && VALID_SIGN ('+', token1->val.str.text[token1->val.str.len - 1]))
+ return CPP_NUMBER;
+ break;
- case '0': case '1': case '2': case '3': case '4':
- case '5': case '6': case '7': case '8': case '9':
- number:
- c2 = '.';
- for (;;)
- {
- CPP_RESERVE (pfile, 2);
- CPP_PUTC_Q (pfile, c);
- c = PEEKC ();
- if (c == EOF)
- break;
- if (!is_numchar(c) && c != '.'
- && ((c2 != 'e' && c2 != 'E'
- && ((c2 != 'p' && c2 != 'P')
- || CPP_OPTION (pfile, c89)))
- || (c != '+' && c != '-')))
- break;
- FORWARD(1);
- c2= c;
- }
- CPP_NUL_TERMINATE_Q (pfile);
- return CPP_NUMBER;
- case 'b': case 'c': case 'd': case 'h': case 'o':
- case 'B': case 'C': case 'D': case 'H': case 'O':
- if (CPP_OPTION (pfile, chill) && PEEKC () == '\'')
+ default:
+ break;
+ }
+
+ return CPP_EOF;
+}
+
+/* Check if TOKEN is to be ##-pasted with the token after it. */
+static const cpp_token *
+maybe_paste_with_next (pfile, token)
+ cpp_reader *pfile;
+ const cpp_token *token;
+{
+ cpp_token *pasted;
+ const cpp_token *second;
+ cpp_context *context = CURRENT_CONTEXT (pfile);
+
+ /* Is this token on the LHS of ## ? */
+
+ while ((token->flags & PASTE_LEFT)
+ || ((context->flags & CONTEXT_PASTEL)
+ && context->posn == context->count))
+ {
+ /* Suppress macro expansion for next token, but don't conflict
+ with the other method of suppression. If it is an argument,
+ macro expansion within the argument will still occur. */
+ pfile->paste_level = pfile->cur_context;
+ second = _cpp_get_token (pfile);
+ pfile->paste_level = 0;
+
+ /* Ignore placemarker argument tokens (cannot be from an empty
+ macro since macros are not expanded). */
+ if (token->type == CPP_PLACEMARKER)
+ pasted = duplicate_token (pfile, second);
+ else if (second->type == CPP_PLACEMARKER)
{
- CPP_RESERVE (pfile, 2);
- CPP_PUTC_Q (pfile, c);
- CPP_PUTC_Q (pfile, '\'');
- FORWARD(1);
- for (;;)
- {
- c = GETC();
- if (c == EOF)
- goto chill_number_eof;
- if (!is_numchar(c))
- break;
- CPP_PUTC (pfile, c);
- }
- if (c == '\'')
- {
- CPP_RESERVE (pfile, 2);
- CPP_PUTC_Q (pfile, c);
- CPP_NUL_TERMINATE_Q (pfile);
- return CPP_STRING;
- }
+ /* GCC has special extended semantics for a ## b where b is
+ a varargs parameter: a disappears if b was given no actual
+ arguments (not merely if b is an empty argument). */
+ if (second->flags & VOID_REST)
+ pasted = duplicate_token (pfile, second);
else
- {
- FORWARD(-1);
- chill_number_eof:
- CPP_NUL_TERMINATE (pfile);
- return CPP_NUMBER;
- }
+ pasted = duplicate_token (pfile, token);
}
else
- goto letter;
- case '_':
- case 'a': case 'e': case 'f': case 'g': case 'i': case 'j':
- case 'k': case 'l': case 'm': case 'n': 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 'E': case 'F': case 'G': case 'I': case 'J':
- case 'K': case 'M': case 'N': case 'P': case 'Q': case 'R':
- case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
- case 'Y': case 'Z':
- letter:
- _cpp_parse_name (pfile, c);
- return CPP_MACRO;
-
- case ' ': case '\t': case '\v': case '\f': case '\0':
- {
- int null_count = 0;
-
- for (;;)
- {
- if (c == '\0')
- null_count++;
- else
- CPP_PUTC (pfile, c);
- c = PEEKC ();
- if (c == EOF || !is_hspace(c))
- break;
- FORWARD(1);
- }
- if (null_count)
- null_warning (pfile, null_count);
- return CPP_HSPACE;
- }
-
- case '\r':
- if (CPP_BUFFER (pfile)->has_escapes)
{
- c = GETC ();
- if (c == '-')
+ int digraph = 0;
+ enum cpp_ttype type = can_paste (pfile, token, second, &digraph);
+
+ if (type == CPP_EOF)
{
- if (pfile->output_escapes)
- CPP_PUTS (pfile, "\r-", 2);
- _cpp_parse_name (pfile, GETC ());
- return CPP_NAME;
+ if (CPP_OPTION (pfile, warn_paste))
+ cpp_warning (pfile,
+ "pasting would not give a valid preprocessing token");
+ _cpp_push_token (pfile, second);
+ return token;
}
- else if (c == ' ')
+
+ if (type == CPP_NAME || type == CPP_NUMBER)
{
- /* "\r " means a space, but only if necessary to prevent
- accidental token concatenation. */
- CPP_RESERVE (pfile, 2);
- if (pfile->output_escapes)
- CPP_PUTC_Q (pfile, '\r');
- CPP_PUTC_Q (pfile, c);
- return CPP_HSPACE;
+ /* Join spellings. */
+ U_CHAR *buf, *end;
+
+ pasted = get_temp_token (pfile);
+ buf = (U_CHAR *) alloca (TOKEN_LEN (token) + TOKEN_LEN (second));
+ end = spell_token (pfile, token, buf);
+ end = spell_token (pfile, second, end);
+ *end = '\0';
+
+ if (type == CPP_NAME)
+ pasted->val.node = cpp_lookup (pfile, buf, end - buf);
+ else
+ {
+ pasted->val.str.text = uxstrdup (buf);
+ pasted->val.str.len = end - buf;
+ }
}
+ else if (type == CPP_WCHAR || type == CPP_WSTRING)
+ pasted = duplicate_token (pfile, second);
else
{
- cpp_ice (pfile, "unrecognized escape \\r%c", c);
- goto get_next;
+ pasted = get_temp_token (pfile);
+ pasted->val.integer = 0;
}
+
+ pasted->type = type;
+ pasted->flags = digraph ? DIGRAPH : 0;
+
+ if (type == CPP_NAME && pasted->val.node->type == T_OPERATOR)
+ {
+ pasted->type = pasted->val.node->value.code;
+ pasted->flags |= NAMED_OP;
+ }
+ }
+
+ /* The pasted token gets the whitespace flags and position of the
+ first token, the PASTE_LEFT flag of the second token, plus the
+ PASTED flag to indicate it is the result of a paste. However, we
+ want to preserve the DIGRAPH flag. */
+ pasted->flags &= ~(PREV_WHITE | BOL | PASTE_LEFT);
+ pasted->flags |= ((token->flags & (PREV_WHITE | BOL))
+ | (second->flags & PASTE_LEFT) | PASTED);
+ pasted->col = token->col;
+ pasted->line = token->line;
+
+ /* 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;
+}
+
+/* Convert a token sequence to a single string token according to the
+ rules of the ISO C #-operator. */
+#define INIT_SIZE 200
+static cpp_token *
+stringify_arg (pfile, token)
+ cpp_reader *pfile;
+ const cpp_token *token;
+{
+ cpp_token *result;
+ unsigned char *main_buf;
+ unsigned int prev_value, backslash_count = 0;
+ unsigned int buf_used = 0, whitespace = 0, buf_cap = INIT_SIZE;
+
+ push_arg_context (pfile, token);
+ prev_value = prevent_macro_expansion (pfile);
+ main_buf = (unsigned char *) xmalloc (buf_cap);
+
+ result = get_temp_token (pfile);
+ ASSIGN_FLAGS_AND_POS (result, token);
+
+ for (; (token = _cpp_get_token (pfile))->type != CPP_EOF; )
+ {
+ int escape;
+ unsigned char *buf;
+ unsigned int len = TOKEN_LEN (token);
+
+ if (token->type == CPP_PLACEMARKER)
+ continue;
+
+ escape = (token->type == CPP_STRING || token->type == CPP_WSTRING
+ || token->type == CPP_CHAR || token->type == CPP_WCHAR);
+ if (escape)
+ len *= 4 + 1;
+
+ if (buf_used + len > buf_cap)
+ {
+ buf_cap = buf_used + len + INIT_SIZE;
+ main_buf = xrealloc (main_buf, buf_cap);
}
+
+ if (whitespace && (token->flags & PREV_WHITE))
+ main_buf[buf_used++] = ' ';
+
+ if (escape)
+ buf = (unsigned char *) xmalloc (len);
else
+ buf = main_buf + buf_used;
+
+ len = spell_token (pfile, token, buf) - buf;
+ if (escape)
{
- /* Backslash newline is ignored. */
- CPP_BUMP_LINE (pfile);
- goto get_next;
+ buf_used = quote_string (&main_buf[buf_used], buf, len) - main_buf;
+ free (buf);
}
+ else
+ buf_used += len;
- case '\n':
- CPP_PUTC (pfile, c);
- return CPP_VSPACE;
-
- case '(': token = CPP_LPAREN; goto char1;
- case ')': token = CPP_RPAREN; goto char1;
- case '{': token = CPP_LBRACE; goto char1;
- case '}': token = CPP_RBRACE; goto char1;
- case ',': token = CPP_COMMA; goto char1;
- case ';': token = CPP_SEMICOLON; goto char1;
+ whitespace = 1;
+ if (token->type == CPP_BACKSLASH)
+ backslash_count++;
+ else
+ backslash_count = 0;
+ }
- randomchar:
- default:
- token = CPP_OTHER;
- char1:
- CPP_PUTC (pfile, c);
- return token;
+ /* Ignore the final \ of invalid string literals. */
+ if (backslash_count & 1)
+ {
+ cpp_warning (pfile, "invalid string literal, ignoring final '\\'");
+ buf_used--;
}
+
+ result->type = CPP_STRING;
+ result->val.str.text = main_buf;
+ result->val.str.len = buf_used;
+ restore_macro_expansion (pfile, prev_value);
+ return result;
}
-/* Check for and expand a macro, which is from WRITTEN to CPP_WRITTEN (pfile).
- Caller is expected to have checked no_macro_expand. */
-static int
-maybe_macroexpand (pfile, written)
+/* Allocate more room on the context stack of PFILE. */
+static void
+expand_context_stack (pfile)
cpp_reader *pfile;
- long written;
{
- U_CHAR *macro = pfile->token_buffer + written;
- size_t len = CPP_WRITTEN (pfile) - written;
- HASHNODE *hp = _cpp_lookup (pfile, macro, len);
+ pfile->context_cap += pfile->context_cap + 20;
+ pfile->contexts = (cpp_context *)
+ xrealloc (pfile->contexts, pfile->context_cap * sizeof (cpp_context));
+}
- if (!hp)
- return 0;
- if (hp->type == T_DISABLED)
+/* Push the context of macro NODE onto the context stack. TOKEN is
+ the CPP_NAME token invoking the macro. */
+static int
+push_macro_context (pfile, token)
+ cpp_reader *pfile;
+ const cpp_token *token;
+{
+ unsigned char orig_flags;
+ macro_args *args;
+ cpp_context *context;
+ cpp_hashnode *node = token->val.node;
+
+ /* Token's flags may change when parsing args containing a nested
+ invocation of this macro. */
+ orig_flags = token->flags & (PREV_WHITE | BOL);
+ args = 0;
+ if (node->value.expansion->paramc >= 0)
{
- if (pfile->output_escapes)
+ unsigned int error, prev_nme;
+
+ /* Allocate room for the argument contexts, and parse them. */
+ args = (macro_args *) xmalloc (sizeof (macro_args));
+ args->ends = (unsigned int *)
+ xmalloc (node->value.expansion->paramc * sizeof (unsigned int));
+ args->tokens = 0;
+ args->capacity = 0;
+ args->used = 0;
+ args->level = pfile->cur_context;
+
+ prev_nme = prevent_macro_expansion (pfile);
+ pfile->args = args;
+ error = parse_args (pfile, node, args);
+ pfile->args = 0;
+ restore_macro_expansion (pfile, prev_nme);
+ if (error)
{
- /* Insert a no-reexpand marker before IDENT. */
- CPP_RESERVE (pfile, 2);
- CPP_ADJUST_WRITTEN (pfile, 2);
- macro = pfile->token_buffer + written;
-
- memmove (macro + 2, macro, len);
- macro[0] = '\r';
- macro[1] = '-';
+ free_macro_args (args);
+ return 1;
}
- return 0;
- }
- if (hp->type == T_EMPTY)
- {
- /* Special case optimization: macro expands to nothing. */
- CPP_SET_WRITTEN (pfile, written);
- CPP_PUTC_Q (pfile, ' ');
- return 1;
}
- /* If macro wants an arglist, verify that a '(' follows. */
- if (hp->type == T_MACRO && hp->value.defn->nargs >= 0)
- {
- int macbuf_whitespace = 0;
- int c;
+ /* Now push its context. */
+ pfile->cur_context++;
+ if (pfile->cur_context == pfile->context_cap)
+ expand_context_stack (pfile);
- while (CPP_IS_MACRO_BUFFER (CPP_BUFFER (pfile)))
- {
- const U_CHAR *point = CPP_BUFFER (pfile)->cur;
- for (;;)
- {
- _cpp_skip_hspace (pfile);
- c = PEEKC ();
- if (c == '\n')
- FORWARD(1);
- else
- break;
- }
- if (point != CPP_BUFFER (pfile)->cur)
- macbuf_whitespace = 1;
- if (c == '(')
- goto is_macro_call;
- else if (c != EOF)
- goto not_macro_call;
- cpp_pop_buffer (pfile);
- }
+ context = CURRENT_CONTEXT (pfile);
+ context->u.list = node->value.expansion;
+ context->args = args;
+ context->posn = 0;
+ context->count = context->u.list->tokens_used;
+ context->level = pfile->cur_context;
+ context->flags = 0;
+ context->pushed_token = 0;
- CPP_SET_MARK (pfile);
- for (;;)
- {
- _cpp_skip_hspace (pfile);
- c = PEEKC ();
- if (c == '\n')
- FORWARD(1);
- else
- break;
- }
- CPP_GOTO_MARK (pfile);
+ /* Set the flags of the first token. We know there must
+ be one, empty macros are a single placemarker token. */
+ MODIFY_FLAGS_AND_POS (&context->u.list->tokens[0], token, orig_flags);
+
+ return 0;
+}
+
+/* Push an argument to the current macro onto the context stack.
+ TOKEN is the MACRO_ARG token representing the argument expansion. */
+static void
+push_arg_context (pfile, token)
+ cpp_reader *pfile;
+ const cpp_token *token;
+{
+ cpp_context *context;
+ macro_args *args;
+
+ pfile->cur_context++;
+ if (pfile->cur_context == pfile->context_cap)
+ expand_context_stack (pfile);
+
+ context = CURRENT_CONTEXT (pfile);
+ args = context[-1].args;
+
+ context->count = token->val.aux ? args->ends[token->val.aux - 1]: 0;
+ context->u.arg = args->tokens + context->count;
+ context->count = args->ends[token->val.aux] - context->count;
+ context->args = 0;
+ context->posn = 0;
+ context->level = args->level;
+ context->flags = CONTEXT_ARG | CONTEXT_RAW;
+ context->pushed_token = 0;
+
+ /* Set the flags of the first token. There is one. */
+ {
+ const cpp_token *first = context->u.arg[0];
+ if (!first)
+ first = context->u.arg[1];
+
+ MODIFY_FLAGS_AND_POS ((cpp_token *) first, token,
+ token->flags & (PREV_WHITE | BOL));
+ }
+
+ if (token->flags & PASTE_LEFT)
+ context->flags |= CONTEXT_PASTEL;
+ if (pfile->paste_level)
+ context->flags |= CONTEXT_PASTER;
+}
+
+/* "Unget" a token. It is effectively inserted in the token queue and
+ will be returned by the next call to get_raw_token. */
+void
+_cpp_push_token (pfile, token)
+ cpp_reader *pfile;
+ const cpp_token *token;
+{
+ cpp_context *context = CURRENT_CONTEXT (pfile);
+
+ if (context->posn > 0)
+ {
+ const cpp_token *prev;
+ if (IS_ARG_CONTEXT (context))
+ prev = context->u.arg[context->posn - 1];
+ else
+ prev = &context->u.list->tokens[context->posn - 1];
- if (c != '(')
+ if (prev == token)
{
- not_macro_call:
- if (macbuf_whitespace)
- CPP_PUTC (pfile, ' ');
- return 0;
+ context->posn--;
+ return;
}
}
- is_macro_call:
- /* This is now known to be a macro call.
- Expand the macro, reading arguments as needed,
- and push the expansion on the input stack. */
- _cpp_macroexpand (pfile, hp);
- CPP_SET_WRITTEN (pfile, written);
- return 1;
+ if (context->pushed_token)
+ cpp_ice (pfile, "two tokens pushed in a row");
+ if (token->type != CPP_EOF)
+ context->pushed_token = token;
+ /* Don't push back a directive's CPP_EOF, step back instead. */
+ else if (pfile->cur_context == 0)
+ pfile->contexts[0].posn--;
}
-enum cpp_token
-cpp_get_token (pfile)
+/* Handle a preprocessing directive. TOKEN is the CPP_HASH token
+ introducing the directive. */
+static void
+process_directive (pfile, token)
cpp_reader *pfile;
+ const cpp_token *token;
{
- enum cpp_token token;
- long written = CPP_WRITTEN (pfile);
-
- get_next:
- token = _cpp_lex_token (pfile);
+ const struct directive *d = pfile->token_list.directive;
+ int prev_nme = 0;
+
+ /* Skip over the directive name. */
+ if (token[1].type == CPP_NAME)
+ _cpp_get_raw_token (pfile);
+ else if (token[1].type != CPP_NUMBER)
+ cpp_ice (pfile, "directive begins with %s?!", TOKEN_NAME (token));
+
+ /* Flush pending tokens at this point, in case the directive produces
+ output. XXX Directive output won't be visible to a direct caller of
+ cpp_get_token. */
+ if (pfile->printer && CPP_WRITTEN (pfile) - pfile->printer->written)
+ cpp_output_tokens (pfile, pfile->printer, pfile->token_list.line);
+
+ if (! (d->flags & EXPAND))
+ prev_nme = prevent_macro_expansion (pfile);
+ (void) (*d->handler) (pfile);
+ if (! (d->flags & EXPAND))
+ restore_macro_expansion (pfile, prev_nme);
+ _cpp_skip_rest_of_line (pfile);
+}
- switch (token)
+/* The external interface to return the next token. All macro
+ expansion and directive processing is handled internally, the
+ caller only ever sees the output after preprocessing. */
+const cpp_token *
+cpp_get_token (pfile)
+ cpp_reader *pfile;
+{
+ const cpp_token *token;
+ /* Loop till we hit a non-directive, non-placemarker token. */
+ for (;;)
{
- default:
- pfile->potential_control_macro = 0;
- pfile->only_seen_white = 0;
- return token;
+ token = _cpp_get_token (pfile);
- case CPP_VSPACE:
- if (pfile->only_seen_white == 0)
- pfile->only_seen_white = 1;
- CPP_BUMP_LINE (pfile);
- if (! CPP_OPTION (pfile, no_line_commands))
+ if (token->type == CPP_PLACEMARKER)
+ continue;
+
+ if (token->type == CPP_HASH && token->flags & BOL
+ && pfile->token_list.directive)
{
- pfile->lineno++;
- if (CPP_BUFFER (pfile)->lineno != pfile->lineno)
- _cpp_output_line_command (pfile, same_file);
+ process_directive (pfile, token);
+ continue;
}
- return token;
- case CPP_HSPACE:
- case CPP_COMMENT:
return token;
+ }
+}
- case CPP_DIRECTIVE:
- pfile->potential_control_macro = 0;
- if (_cpp_handle_directive (pfile))
- return CPP_DIRECTIVE;
- pfile->only_seen_white = 0;
- CPP_PUTC (pfile, '#');
- return CPP_OTHER;
+/* The internal interface to return the next token. There are two
+ differences between the internal and external interfaces: the
+ internal interface may return a PLACEMARKER token, and it does not
+ process directives. */
+const cpp_token *
+_cpp_get_token (pfile)
+ cpp_reader *pfile;
+{
+ const cpp_token *token;
+ cpp_hashnode *node;
- case CPP_MACRO:
- pfile->potential_control_macro = 0;
- pfile->only_seen_white = 0;
- if (! pfile->no_macro_expand
- && maybe_macroexpand (pfile, written))
- goto get_next;
- return CPP_NAME;
-
- case CPP_EOF:
- if (CPP_BUFFER (pfile)->manual_pop)
- /* If we've been reading from redirected input, the
- frontend will pop the buffer. */
- return CPP_EOF;
- else if (CPP_BUFFER (pfile)->seen_eof)
+ /* Loop until we hit a non-macro token. */
+ for (;;)
+ {
+ token = get_raw_token (pfile);
+
+ /* Short circuit EOF. */
+ if (token->type == CPP_EOF)
+ return token;
+
+ /* If we are skipping... */
+ if (pfile->skipping)
{
- if (CPP_PREV_BUFFER (CPP_BUFFER (pfile)) == NULL)
- return CPP_EOF;
+ /* we still have to process directives, */
+ if (pfile->token_list.directive)
+ return token;
- cpp_pop_buffer (pfile);
- goto get_next;
+ /* but everything else is ignored. */
+ _cpp_skip_rest_of_line (pfile);
+ continue;
}
- else
+
+ /* If there's a potential control macro and we get here, then that
+ #ifndef didn't cover the entire file and its argument shouldn't
+ be taken as a control macro. */
+ pfile->potential_control_macro = 0;
+
+ /* See if there's a token to paste with this one. */
+ if (!pfile->paste_level)
+ token = maybe_paste_with_next (pfile, token);
+
+ /* If it isn't a macro, return it now. */
+ if (token->type != CPP_NAME || token->val.node->type == T_VOID)
+ return token;
+
+ /* Is macro expansion disabled in general, or are we in the
+ middle of a token paste? */
+ if (pfile->no_expand_level == pfile->cur_context || pfile->paste_level)
+ return token;
+
+ node = token->val.node;
+ if (node->type != T_MACRO)
+ return special_symbol (pfile, node, token);
+
+ if (is_macro_disabled (pfile, node->value.expansion, token))
+ return token;
+
+ if (pfile->cur_context > CPP_STACK_MAX)
{
- _cpp_handle_eof (pfile);
- return CPP_POP;
+ cpp_error (pfile, "macros nested too deep invoking '%s'", node->name);
+ return token;
}
+
+ if (push_macro_context (pfile, token))
+ return token;
+ /* else loop */
}
}
-/* Like cpp_get_token, but skip spaces and comments. */
-
-enum cpp_token
-cpp_get_non_space_token (pfile)
+/* Returns the next raw token, i.e. without performing macro
+ expansion. Argument contexts are automatically entered. */
+static const cpp_token *
+get_raw_token (pfile)
cpp_reader *pfile;
{
- int old_written = CPP_WRITTEN (pfile);
+ const cpp_token *result;
+ cpp_context *context;
+
for (;;)
{
- enum cpp_token token = cpp_get_token (pfile);
- if (token != CPP_COMMENT && token != CPP_HSPACE && token != CPP_VSPACE)
- return token;
- CPP_SET_WRITTEN (pfile, old_written);
+ context = CURRENT_CONTEXT (pfile);
+ if (context->pushed_token)
+ {
+ result = context->pushed_token;
+ context->pushed_token = 0;
+ return result; /* Cannot be a CPP_MACRO_ARG */
+ }
+ else if (context->posn == context->count)
+ {
+ if (pop_context (pfile))
+ return &eof_token;
+ continue;
+ }
+ else if (IS_ARG_CONTEXT (context))
+ {
+ result = context->u.arg[context->posn++];
+ if (result == 0)
+ {
+ context->flags ^= CONTEXT_RAW;
+ result = context->u.arg[context->posn++];
+ }
+ return result; /* Cannot be a CPP_MACRO_ARG */
+ }
+
+ result = &context->u.list->tokens[context->posn++];
+
+ if (result->type != CPP_MACRO_ARG)
+ return result;
+
+ if (result->flags & STRINGIFY_ARG)
+ return stringify_arg (pfile, result);
+
+ push_arg_context (pfile, result);
}
}
-/* Like cpp_get_token, except that it does not execute directives,
- does not consume vertical space, and automatically pops off macro
- buffers.
+/* Internal interface to get the token without macro expanding. */
+const cpp_token *
+_cpp_get_raw_token (pfile)
+ cpp_reader *pfile;
+{
+ int prev_nme = prevent_macro_expansion (pfile);
+ const cpp_token *result = _cpp_get_token (pfile);
+ restore_macro_expansion (pfile, prev_nme);
+ return result;
+}
- XXX This function will exist only till collect_expansion doesn't
- need to see whitespace anymore, then it'll be merged with
- _cpp_get_directive_token (below). */
-enum cpp_token
-_cpp_get_define_token (pfile)
+/* A thin wrapper to lex_line. CLEAR is non-zero if the current token
+ list should be overwritten, or zero if we need to append
+ (typically, if we are within the arguments to a macro, or looking
+ for the '(' to start a function-like macro invocation). */
+static int
+lex_next (pfile, clear)
cpp_reader *pfile;
+ int clear;
{
- long old_written;
- enum cpp_token token;
+ cpp_toklist *list = &pfile->token_list;
+ const cpp_token *old_list = list->tokens;
+ unsigned int old_used = list->tokens_used;
- get_next:
- old_written = CPP_WRITTEN (pfile);
- token = _cpp_lex_token (pfile);
- switch (token)
+ if (clear)
{
- default:
- return token;
-
- case CPP_VSPACE:
- /* Put it back and return VSPACE. */
- FORWARD(-1);
- CPP_ADJUST_WRITTEN (pfile, -1);
- return CPP_VSPACE;
+ /* Release all temporary tokens. */
+ _cpp_clear_toklist (list);
+ pfile->contexts[0].posn = 0;
+ if (pfile->temp_used)
+ release_temp_tokens (pfile);
+ }
+ lex_line (pfile, list);
+ pfile->contexts[0].count = list->tokens_used;
- case CPP_HSPACE:
- if (CPP_PEDANTIC (pfile))
+ if (!clear && pfile->args)
+ {
+ /* Fix up argument token pointers. */
+ if (old_list != list->tokens)
{
- U_CHAR *p, *limit;
- p = pfile->token_buffer + old_written;
- limit = CPP_PWRITTEN (pfile);
- while (p < limit)
+ unsigned int i;
+
+ for (i = 0; i < pfile->args->used; i++)
{
- if (*p == '\v' || *p == '\f')
- cpp_pedwarn (pfile, "%s in preprocessing directive",
- *p == '\f' ? "formfeed" : "vertical tab");
- p++;
+ const cpp_token *token = pfile->args->tokens[i];
+ if (token >= old_list && token < old_list + old_used)
+ pfile->args->tokens[i] = (const cpp_token *)
+ ((char *) token + ((char *) list->tokens - (char *) old_list));
}
}
- return CPP_HSPACE;
- case CPP_DIRECTIVE:
- /* Don't execute the directive, but don't smash it to OTHER either. */
- CPP_PUTC (pfile, '#');
- return CPP_DIRECTIVE;
+ /* 6.10.3 paragraph 11: If there are sequences of preprocessing
+ tokens within the list of arguments that would otherwise act as
+ preprocessing directives, the behavior is undefined.
- case CPP_MACRO:
- if (! pfile->no_macro_expand
- && maybe_macroexpand (pfile, old_written))
- goto get_next;
- return CPP_NAME;
+ This implementation will report a hard error and treat the
+ 'sequence of preprocessing tokens' as part of the macro argument,
+ not a directive.
- case CPP_EOF:
- if (CPP_IS_MACRO_BUFFER (CPP_BUFFER (pfile)))
+ Note if pfile->args == 0, we're OK since we're only inside a
+ macro argument after a '('. */
+ if (list->directive)
{
- cpp_pop_buffer (pfile);
- goto get_next;
+ cpp_error_with_line (pfile, list->tokens[old_used].line,
+ list->tokens[old_used].col,
+ "#%s may not be used inside a macro argument",
+ list->directive->name);
+ return 1;
}
- else
- /* This can happen for files that don't end with a newline,
- and for cpp_define and friends. Pretend they do, so
- callers don't have to deal. A warning will be issued by
- someone else, if necessary. */
- return CPP_VSPACE;
}
-}
-/* Just like _cpp_get_define_token except that it discards horizontal
- whitespace. */
+ return 0;
+}
-enum cpp_token
-_cpp_get_directive_token (pfile)
+/* Pops a context off the context stack. If we're at the bottom, lexes
+ the next logical line. Returns EOF if we're at the end of the
+ argument list to the # operator, or if it is illegal to "overflow"
+ into the rest of the file (e.g. 6.10.3.1.1). */
+static int
+pop_context (pfile)
cpp_reader *pfile;
{
- int old_written = CPP_WRITTEN (pfile);
- for (;;)
+ cpp_context *context;
+
+ if (pfile->cur_context == 0)
{
- enum cpp_token token = _cpp_get_define_token (pfile);
- if (token != CPP_COMMENT && token != CPP_HSPACE)
- return token;
- CPP_SET_WRITTEN (pfile, old_written);
+ /* If we are currently processing a directive, do not advance. 6.10
+ paragraph 2: A new-line character ends the directive even if it
+ occurs within what would otherwise be an invocation of a
+ function-like macro. */
+ if (pfile->token_list.directive)
+ return 1;
+
+ return lex_next (pfile, pfile->no_expand_level == UINT_MAX);
}
+
+ /* Argument contexts, when parsing args or handling # operator
+ return CPP_EOF at the end. */
+ context = CURRENT_CONTEXT (pfile);
+ if (IS_ARG_CONTEXT (context) && pfile->cur_context == pfile->no_expand_level)
+ return 1;
+
+ /* Free resources when leaving macro contexts. */
+ if (context->args)
+ free_macro_args (context->args);
+
+ if (pfile->cur_context == pfile->no_expand_level)
+ pfile->no_expand_level--;
+ pfile->cur_context--;
+
+ return 0;
}
-/* Determine the current line and column. Used only by read_and_prescan. */
-static U_CHAR *
-find_position (start, limit, linep)
- U_CHAR *start;
- U_CHAR *limit;
- unsigned long *linep;
+/* Turn off macro expansion at the current context level. */
+static unsigned int
+prevent_macro_expansion (pfile)
+ cpp_reader *pfile;
{
- unsigned long line = *linep;
- U_CHAR *lbase = start;
- while (start < limit)
- {
- U_CHAR ch = *start++;
- if (ch == '\n' || ch == '\r')
- {
- line++;
- lbase = start;
- }
- }
- *linep = line;
- return lbase;
+ unsigned int prev_value = pfile->no_expand_level;
+ pfile->no_expand_level = pfile->cur_context;
+ return prev_value;
}
-/* The following table is used by _cpp_read_and_prescan. If we have
- designated initializers, it can be constant data; otherwise, it is
- set up at runtime by _cpp_init_input_buffer. */
-
-#ifndef UCHAR_MAX
-#define UCHAR_MAX 255 /* assume 8-bit bytes */
-#endif
-
-#if (GCC_VERSION >= 2007) || (__STDC_VERSION__ >= 199901L)
-#define init_chartab() /* nothing */
-#define CHARTAB static const unsigned char chartab[UCHAR_MAX + 1] = {
-#define END };
-#define s(p, v) [p] = v,
-#else
-#define CHARTAB static unsigned char chartab[UCHAR_MAX + 1] = { 0 }; \
- static void init_chartab PARAMS ((void)) { \
- unsigned char *x = chartab;
-#define END }
-#define s(p, v) x[p] = v;
-#endif
+/* Restore macro expansion to its previous state. */
+static void
+restore_macro_expansion (pfile, prev_value)
+ cpp_reader *pfile;
+ unsigned int prev_value;
+{
+ pfile->no_expand_level = prev_value;
+}
-/* Table of characters that can't be handled in the inner loop.
- Also contains the mapping between trigraph third characters and their
- replacements. */
-#define SPECCASE_CR 1
-#define SPECCASE_BACKSLASH 2
-#define SPECCASE_QUESTION 3
-
-CHARTAB
- s('\r', SPECCASE_CR)
- s('\\', SPECCASE_BACKSLASH)
- s('?', SPECCASE_QUESTION)
+/* Used by cpperror.c to obtain the correct line and column to report
+ in a diagnostic. */
+unsigned int
+_cpp_get_line (pfile, pcol)
+ cpp_reader *pfile;
+ unsigned int *pcol;
+{
+ unsigned int index;
+ const cpp_token *cur_token;
- s('=', '#') s(')', ']') s('!', '|')
- s('(', '[') s('\'', '^') s('>', '}')
- s('/', '\\') s('<', '{') s('-', '~')
-END
+ if (pfile->in_lex_line)
+ index = pfile->token_list.tokens_used;
+ else
+ index = pfile->contexts[0].posn;
-#undef CHARTAB
-#undef END
-#undef s
+ cur_token = &pfile->token_list.tokens[index - 1];
+ if (pcol)
+ *pcol = cur_token->col;
+ return cur_token->line;
+}
-#define NORMAL(c) ((chartab[c]) == 0 || (chartab[c]) > SPECCASE_QUESTION)
-#define NONTRI(c) ((c) <= SPECCASE_QUESTION)
-
-/* Read the entire contents of file DESC into buffer BUF. LEN is how
- much memory to allocate initially; more will be allocated if
- necessary. Convert end-of-line markers (\n, \r, \r\n, \n\r) to
- canonical form (\n). If enabled, convert and/or warn about
- trigraphs. Convert backslash-newline to a one-character escape
- (\r) and remove it from "embarrassing" places (i.e. the middle of a
- token). If there is no newline at the end of the file, add one and
- warn. Returns -1 on failure, or the actual length of the data to
- be scanned.
-
- This function does a lot of work, and can be a serious performance
- bottleneck. It has been tuned heavily; make sure you understand it
- before hacking. The common case - no trigraphs, Unix style line
- breaks, backslash-newline set off by whitespace, newline at EOF -
- has been optimized at the expense of the others. The performance
- penalty for DOS style line breaks (\r\n) is about 15%.
-
- Warnings lose particularly heavily since we have to determine the
- line number, which involves scanning from the beginning of the file
- or from the last warning. The penalty for the absence of a newline
- at the end of reload1.c is about 60%. (reload1.c is 329k.)
+#define DSC(str) (const U_CHAR *)str, sizeof str - 1
+static const char * const monthnames[] =
+{
+ "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+ "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
+};
- If your file has more than one kind of end-of-line marker, you
- will get messed-up line numbering.
-
- So that the cases of the switch statement do not have to concern
- themselves with the complications of reading beyond the end of the
- buffer, the buffer is guaranteed to have at least 3 characters in
- it (or however many are left in the file, if less) on entry to the
- switch. This is enough to handle trigraphs and the "\\\n\r" and
- "\\\r\n" cases.
-
- The end of the buffer is marked by a '\\', which, being a special
- character, guarantees we will exit the fast-scan loops and perform
- a refill. */
-
-long
-_cpp_read_and_prescan (pfile, fp, desc, len)
+/* Handle builtin macros like __FILE__. */
+static const cpp_token *
+special_symbol (pfile, node, token)
cpp_reader *pfile;
- cpp_buffer *fp;
- int desc;
- size_t len;
+ cpp_hashnode *node;
+ const cpp_token *token;
{
- U_CHAR *buf = (U_CHAR *) xmalloc (len);
- U_CHAR *ip, *op, *line_base;
- U_CHAR *ibase;
- unsigned long line;
- unsigned int deferred_newlines;
- size_t offset;
- int count = 0;
-
- offset = 0;
- deferred_newlines = 0;
- op = buf;
- line_base = buf;
- line = 1;
- ibase = pfile->input_buffer + 3;
- ip = ibase;
- ip[-1] = '\0'; /* Guarantee no match with \n for SPECCASE_CR */
+ cpp_token *result;
+ cpp_buffer *ip;
- for (;;)
+ switch (node->type)
{
- U_CHAR *near_buff_end;
+ case T_FILE:
+ case T_BASE_FILE:
+ {
+ const char *file;
- /* Copy previous char plus unprocessed (at most 2) chars
- to beginning of buffer, refill it with another
- read(), and continue processing */
- memcpy(ip - count - 1, ip - 1, 3);
- ip -= count;
+ ip = CPP_BUFFER (pfile);
+ if (ip == 0)
+ file = "";
+ else
+ {
+ if (node->type == T_BASE_FILE)
+ while (CPP_PREV_BUFFER (ip) != NULL)
+ ip = CPP_PREV_BUFFER (ip);
- count = read (desc, ibase, pfile->input_buffer_len);
- if (count < 0)
- goto error;
-
- ibase[count] = '\\'; /* Marks end of buffer */
- if (count)
- {
- near_buff_end = pfile->input_buffer + count;
- offset += count;
- if (offset > len)
- {
- size_t delta_op;
- size_t delta_line_base;
- len *= 2;
- if (offset > len)
- /* len overflowed.
- This could happen if the file is larger than half the
- maximum address space of the machine. */
- goto too_big;
-
- delta_op = op - buf;
- delta_line_base = line_base - buf;
- buf = (U_CHAR *) xrealloc (buf, len);
- op = buf + delta_op;
- line_base = buf + delta_line_base;
- }
- }
- else
- {
- if (ip == ibase)
- break;
- /* Allow normal processing of the (at most 2) remaining
- characters. The end-of-buffer marker is still present
- and prevents false matches within the switch. */
- near_buff_end = ibase - 1;
- }
+ file = ip->nominal_fname;
+ }
+ result = make_string_token (get_temp_token (pfile), (U_CHAR *) file,
+ strlen (file));
+ }
+ break;
+
+ case T_INCLUDE_LEVEL:
+ /* pfile->include_depth counts the primary source as level 1,
+ but historically __INCLUDE_DEPTH__ has called the primary
+ source level 0. */
+ result = alloc_number_token (pfile, pfile->include_depth - 1);
+ break;
+
+ case T_SPECLINE:
+ /* If __LINE__ is embedded in a macro, it must expand to the
+ line of the macro's invocation, not its definition.
+ Otherwise things like assert() will not work properly. */
+ result = alloc_number_token (pfile, _cpp_get_line (pfile, NULL));
+ break;
+
+ case T_STDC:
+ {
+ int stdc = 1;
- for (;;)
- {
- unsigned int span;
+#ifdef STDC_0_IN_SYSTEM_HEADERS
+ if (CPP_IN_SYSTEM_HEADER (pfile)
+ && pfile->spec_nodes->n__STRICT_ANSI__->type == T_VOID)
+ stdc = 0;
+#endif
+ result = alloc_number_token (pfile, stdc);
+ }
+ break;
- /* Deal with \-newline, potentially in the middle of a token. */
- if (deferred_newlines)
- {
- if (op != buf && ! is_space (op[-1]) && op[-1] != '\r')
- {
- /* Previous was not white space. Skip to white
- space, if we can, before outputting the \r's */
- span = 0;
- while (ip[span] != ' '
- && ip[span] != '\t'
- && ip[span] != '\n'
- && NORMAL(ip[span]))
- span++;
- memcpy (op, ip, span);
- op += span;
- ip += span;
- if (! NORMAL(ip[0]))
- goto do_speccase;
- }
- while (deferred_newlines)
- deferred_newlines--, *op++ = '\r';
- }
+ case T_DATE:
+ case T_TIME:
+ if (pfile->date == 0)
+ {
+ /* Allocate __DATE__ and __TIME__ from permanent storage,
+ and save them in pfile so we don't have to do this again.
+ We don't generate these strings at init time because
+ time() and localtime() are very slow on some systems. */
+ time_t tt = time (NULL);
+ struct tm *tb = localtime (&tt);
+
+ pfile->date = make_string_token
+ ((cpp_token *) xmalloc (sizeof (cpp_token)), DSC("Oct 11 1347"));
+ pfile->time = make_string_token
+ ((cpp_token *) xmalloc (sizeof (cpp_token)), DSC("12:34:56"));
+
+ sprintf ((char *) pfile->date->val.str.text, "%s %2d %4d",
+ monthnames[tb->tm_mon], tb->tm_mday, tb->tm_year + 1900);
+ sprintf ((char *) pfile->time->val.str.text, "%02d:%02d:%02d",
+ tb->tm_hour, tb->tm_min, tb->tm_sec);
+ }
+ result = node->type == T_DATE ? pfile->date: pfile->time;
+ break;
- /* Copy as much as we can without special treatment. */
- span = 0;
- while (NORMAL (ip[span])) span++;
- memcpy (op, ip, span);
- op += span;
- ip += span;
+ case T_POISON:
+ cpp_error (pfile, "attempt to use poisoned \"%s\"", node->name);
+ return token;
- do_speccase:
- if (ip > near_buff_end) /* Do we have enough chars? */
- break;
- switch (chartab[*ip++])
- {
- case SPECCASE_CR: /* \r */
- if (ip[-2] != '\n')
- {
- if (*ip == '\n')
- ip++;
- *op++ = '\n';
- }
- break;
+ default:
+ cpp_ice (pfile, "invalid special hash type");
+ return token;
+ }
- case SPECCASE_BACKSLASH: /* \ */
- if (*ip == '\n')
- {
- deferred_newlines++;
- ip++;
- if (*ip == '\r') ip++;
- }
- else if (*ip == '\r')
- {
- deferred_newlines++;
- ip++;
- if (*ip == '\n') ip++;
- }
- else
- *op++ = '\\';
- break;
+ ASSIGN_FLAGS_AND_POS (result, token);
+ return result;
+}
+#undef DSC
- case SPECCASE_QUESTION: /* ? */
- {
- unsigned int d, t;
+/* Dump the original user's spelling of argument index ARG_NO to the
+ macro whose expansion is LIST. */
+static void
+dump_param_spelling (pfile, list, arg_no)
+ cpp_reader *pfile;
+ const cpp_toklist *list;
+ unsigned int arg_no;
+{
+ const U_CHAR *param = list->namebuf;
- *op++ = '?'; /* Normal non-trigraph case */
- if (ip[0] != '?')
- break;
-
- d = ip[1];
- t = chartab[d];
- if (NONTRI (t))
- break;
+ while (arg_no--)
+ param += ustrlen (param) + 1;
+ CPP_PUTS (pfile, param, ustrlen (param));
+}
- if (CPP_OPTION (pfile, warn_trigraphs))
- {
- unsigned long col;
- line_base = find_position (line_base, op, &line);
- col = op - line_base + 1;
- if (CPP_OPTION (pfile, trigraphs))
- cpp_warning_with_line (pfile, line, col,
- "trigraph ??%c converted to %c", d, t);
- else
- cpp_warning_with_line (pfile, line, col,
- "trigraph ??%c ignored", d);
- }
-
- ip += 2;
- if (CPP_OPTION (pfile, trigraphs))
- {
- op[-1] = t; /* Overwrite '?' */
- if (t == '\\')
- {
- op--;
- *--ip = '\\';
- goto do_speccase; /* May need buffer refill */
- }
- }
- else
- {
- *op++ = '?';
- *op++ = d;
- }
- }
- break;
- }
- }
- }
+/* Dump a token list to the output. */
+void
+_cpp_dump_list (pfile, list, token, flush)
+ cpp_reader *pfile;
+ const cpp_toklist *list;
+ const cpp_token *token;
+ int flush;
+{
+ const cpp_token *limit = list->tokens + list->tokens_used;
+ const cpp_token *prev = 0;
- if (offset == 0)
- return 0;
+ /* Avoid the CPP_EOF. */
+ if (list->directive)
+ limit--;
- if (op[-1] != '\n')
+ while (token < limit)
{
- unsigned long col;
- line_base = find_position (line_base, op, &line);
- col = op - line_base + 1;
- cpp_warning_with_line (pfile, line, col, "no newline at end of file\n");
- if (offset + 1 > len)
+ if (token->type == CPP_MACRO_ARG)
{
- len += 1;
- if (offset + 1 > len)
- goto too_big;
- buf = (U_CHAR *) xrealloc (buf, len);
- op = buf + offset;
+ if (token->flags & PREV_WHITE)
+ CPP_PUTC (pfile, ' ');
+ if (token->flags & STRINGIFY_ARG)
+ CPP_PUTC (pfile, '#');
+ dump_param_spelling (pfile, list, token->val.aux);
}
- *op++ = '\n';
+ else if (token->type != CPP_PLACEMARKER)
+ output_token (pfile, token, prev);
+ if (token->flags & PASTE_LEFT)
+ CPP_PUTS (pfile, " ##", 3);
+ prev = token;
+ token++;
}
- fp->buf = ((len - offset < 20) ? buf : (U_CHAR *)xrealloc (buf, op - buf));
- return op - buf;
-
- too_big:
- cpp_error (pfile, "file is too large (>%lu bytes)\n", (unsigned long)offset);
- free (buf);
- return -1;
-
- error:
- cpp_error_from_errno (pfile, fp->ihash->name);
- free (buf);
- return -1;
+ if (flush && pfile->printer)
+ cpp_output_tokens (pfile, pfile->printer, pfile->token_list.line);
}
-/* Allocate pfile->input_buffer, and initialize chartab[]
+/* Allocate pfile->input_buffer, and initialize trigraph_map[]
if it hasn't happened already. */
-
+
void
_cpp_init_input_buffer (pfile)
cpp_reader *pfile;
{
- U_CHAR *tmp;
+ cpp_context *base;
+
+ init_trigraph_map ();
+ _cpp_init_toklist (&pfile->token_list, DUMMY_TOKEN);
+ pfile->no_expand_level = UINT_MAX;
+ pfile->context_cap = 20;
+ pfile->cur_context = 0;
+
+ pfile->contexts = (cpp_context *)
+ xmalloc (pfile->context_cap * sizeof (cpp_context));
+
+ /* Clear the base context. */
+ base = &pfile->contexts[0];
+ base->u.list = &pfile->token_list;
+ base->posn = 0;
+ base->count = 0;
+ base->args = 0;
+ base->level = 0;
+ base->flags = 0;
+ base->pushed_token = 0;
+}
+
+/* Moves to the end of the directive line, popping contexts as
+ necessary. */
+void
+_cpp_skip_rest_of_line (pfile)
+ cpp_reader *pfile;
+{
+ /* Discard all stacked contexts. */
+ int i;
+ for (i = pfile->cur_context; i > 0; i--)
+ if (pfile->contexts[i].args)
+ free_macro_args (pfile->contexts[i].args);
+
+ if (pfile->no_expand_level <= pfile->cur_context)
+ pfile->no_expand_level = 0;
+ pfile->cur_context = 0;
+
+ /* Clear the base context, and clear the directive pointer so that
+ get_raw_token will advance to the next line. */
+ pfile->contexts[0].count = 0;
+ pfile->contexts[0].posn = 0;
+ pfile->token_list.directive = 0;
+}
+
+/* Directive handler wrapper used by the command line option
+ processor. */
+void
+_cpp_run_directive (pfile, dir, buf, count)
+ cpp_reader *pfile;
+ const struct directive *dir;
+ const char *buf;
+ size_t count;
+{
+ if (cpp_push_buffer (pfile, (const U_CHAR *)buf, count) != NULL)
+ {
+ unsigned int prev_lvl = 0;
- init_chartab ();
+ /* Scan the line now, else prevent_macro_expansion won't work. */
+ lex_next (pfile, 1);
+ if (! (dir->flags & EXPAND))
+ prev_lvl = prevent_macro_expansion (pfile);
- /* Determine the appropriate size for the input buffer. Normal C
- source files are smaller than eight K. */
- /* 8Kbytes of buffer proper, 1 to detect running off the end without
- address arithmetic all the time, and 3 for pushback during buffer
- refill, in case there's a potential trigraph or end-of-line
- digraph at the end of a block. */
+ (void) (*dir->handler) (pfile);
- tmp = (U_CHAR *) xmalloc (8192 + 1 + 3);
- pfile->input_buffer = tmp;
- pfile->input_buffer_len = 8192;
+ if (! (dir->flags & EXPAND))
+ restore_macro_expansion (pfile, prev_lvl);
+
+ _cpp_skip_rest_of_line (pfile);
+ cpp_pop_buffer (pfile);
+ }
}
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