+++ /dev/null
-/* CPP Library - lexical analysis.
- Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.
- Contributed by Per Bothner, 1994-95.
- Based on CCCP program by Paul Rubin, June 1986
- Adapted to ANSI C, Richard Stallman, Jan 1987
- Broken out to separate file, Zack Weinberg, Mar 2000
- Single-pass line tokenization by Neil Booth, April 2000
-
-This program is free software; you can redistribute it and/or modify it
-under the terms of the GNU General Public License as published by the
-Free Software Foundation; either version 2, or (at your option) any
-later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
-
-#include "config.h"
-#include "system.h"
-#include "cpplib.h"
-#include "cpphash.h"
-
-/* MULTIBYTE_CHARS support only works for native compilers.
- ??? Ideally what we want is to model widechar support after
- the current floating point support. */
-#ifdef CROSS_COMPILE
-#undef MULTIBYTE_CHARS
-#endif
-
-#ifdef MULTIBYTE_CHARS
-#include "mbchar.h"
-#include <locale.h>
-#endif
-
-/* Tokens with SPELL_STRING store their spelling in the token list,
- and it's length in the token->val.name.len. */
-enum spell_type
-{
- SPELL_OPERATOR = 0,
- SPELL_CHAR,
- SPELL_IDENT,
- SPELL_NUMBER,
- SPELL_STRING,
- SPELL_NONE
-};
-
-struct token_spelling
-{
- enum spell_type category;
- const unsigned char *name;
-};
-
-static const unsigned char *const digraph_spellings[] =
-{ U"%:", U"%:%:", U"<:", U":>", U"<%", U"%>" };
-
-#define OP(e, s) { SPELL_OPERATOR, U s },
-#define TK(e, s) { s, U STRINGX (e) },
-static const struct token_spelling token_spellings[N_TTYPES] = { TTYPE_TABLE };
-#undef OP
-#undef TK
-
-#define TOKEN_SPELL(token) (token_spellings[(token)->type].category)
-#define TOKEN_NAME(token) (token_spellings[(token)->type].name)
-#define BACKUP() do {buffer->cur = buffer->backup_to;} while (0)
-
-static void handle_newline PARAMS ((cpp_reader *));
-static cppchar_t skip_escaped_newlines PARAMS ((cpp_reader *));
-static cppchar_t get_effective_char PARAMS ((cpp_reader *));
-
-static int skip_block_comment PARAMS ((cpp_reader *));
-static int skip_line_comment PARAMS ((cpp_reader *));
-static void adjust_column PARAMS ((cpp_reader *));
-static int skip_whitespace PARAMS ((cpp_reader *, cppchar_t));
-static cpp_hashnode *parse_identifier PARAMS ((cpp_reader *));
-static cpp_hashnode *parse_identifier_slow PARAMS ((cpp_reader *,
- const U_CHAR *));
-static void parse_number PARAMS ((cpp_reader *, cpp_string *, cppchar_t, int));
-static int unescaped_terminator_p PARAMS ((cpp_reader *, const U_CHAR *));
-static void parse_string PARAMS ((cpp_reader *, cpp_token *, cppchar_t));
-static void unterminated PARAMS ((cpp_reader *, int));
-static bool trigraph_p PARAMS ((cpp_reader *));
-static void save_comment PARAMS ((cpp_reader *, cpp_token *, const U_CHAR *));
-static int name_p PARAMS ((cpp_reader *, const cpp_string *));
-static int maybe_read_ucs PARAMS ((cpp_reader *, const unsigned char **,
- const unsigned char *, unsigned int *));
-static tokenrun *next_tokenrun PARAMS ((tokenrun *));
-
-static unsigned int hex_digit_value PARAMS ((unsigned int));
-static _cpp_buff *new_buff PARAMS ((size_t));
-
-/* Utility routine:
-
- Compares, the token TOKEN to the NUL-terminated string STRING.
- TOKEN must be a CPP_NAME. Returns 1 for equal, 0 for unequal. */
-int
-cpp_ideq (token, string)
- const cpp_token *token;
- const char *string;
-{
- if (token->type != CPP_NAME)
- return 0;
-
- return !ustrcmp (NODE_NAME (token->val.node), (const U_CHAR *) string);
-}
-
-/* Call when meeting a newline, assumed to be in buffer->cur[-1].
- Returns with buffer->cur pointing to the character immediately
- following the newline (combination). */
-static void
-handle_newline (pfile)
- cpp_reader *pfile;
-{
- cpp_buffer *buffer = pfile->buffer;
-
- /* Handle CR-LF and LF-CR. Most other implementations (e.g. java)
- only accept CR-LF; maybe we should fall back to that behaviour? */
- if (buffer->cur[-1] + buffer->cur[0] == '\r' + '\n')
- buffer->cur++;
-
- buffer->line_base = buffer->cur;
- buffer->col_adjust = 0;
- pfile->line++;
-}
-
-/* Subroutine of skip_escaped_newlines; called when a 3-character
- sequence beginning with "??" is encountered. buffer->cur points to
- the second '?'.
-
- Warn if necessary, and returns true if the sequence forms a
- trigraph and the trigraph should be honoured. */
-static bool
-trigraph_p (pfile)
- cpp_reader *pfile;
-{
- cpp_buffer *buffer = pfile->buffer;
- cppchar_t from_char = buffer->cur[1];
- bool accept;
-
- if (!_cpp_trigraph_map[from_char])
- return false;
-
- accept = CPP_OPTION (pfile, trigraphs);
-
- /* Don't warn about trigraphs in comments. */
- if (CPP_OPTION (pfile, warn_trigraphs) && !pfile->state.lexing_comment)
- {
- if (accept)
- cpp_warning_with_line (pfile, pfile->line, CPP_BUF_COL (buffer) - 1,
- "trigraph ??%c converted to %c",
- (int) from_char,
- (int) _cpp_trigraph_map[from_char]);
- else if (buffer->cur != buffer->last_Wtrigraphs)
- {
- buffer->last_Wtrigraphs = buffer->cur;
- cpp_warning_with_line (pfile, pfile->line,
- CPP_BUF_COL (buffer) - 1,
- "trigraph ??%c ignored", (int) from_char);
- }
- }
-
- return accept;
-}
-
-/* Skips any escaped newlines introduced by '?' or a '\\', assumed to
- lie in buffer->cur[-1]. Returns the next byte, which will be in
- buffer->cur[-1]. This routine performs preprocessing stages 1 and
- 2 of the ISO C standard. */
-static cppchar_t
-skip_escaped_newlines (pfile)
- cpp_reader *pfile;
-{
- cpp_buffer *buffer = pfile->buffer;
- cppchar_t next = buffer->cur[-1];
-
- /* Only do this if we apply stages 1 and 2. */
- if (!buffer->from_stage3)
- {
- const unsigned char *saved_cur;
- cppchar_t next1;
-
- do
- {
- if (next == '?')
- {
- if (buffer->cur[0] != '?' || !trigraph_p (pfile))
- break;
-
- /* Translate the trigraph. */
- next = _cpp_trigraph_map[buffer->cur[1]];
- buffer->cur += 2;
- if (next != '\\')
- break;
- }
-
- if (buffer->cur == buffer->rlimit)
- break;
-
- /* We have a backslash, and room for at least one more
- character. Skip horizontal whitespace. */
- saved_cur = buffer->cur;
- do
- next1 = *buffer->cur++;
- while (is_nvspace (next1) && buffer->cur < buffer->rlimit);
-
- if (!is_vspace (next1))
- {
- buffer->cur = saved_cur;
- break;
- }
-
- if (saved_cur != buffer->cur - 1
- && !pfile->state.lexing_comment)
- cpp_warning (pfile, "backslash and newline separated by space");
-
- handle_newline (pfile);
- buffer->backup_to = buffer->cur;
- if (buffer->cur == buffer->rlimit)
- {
- cpp_pedwarn (pfile, "backslash-newline at end of file");
- next = EOF;
- }
- else
- next = *buffer->cur++;
- }
- while (next == '\\' || next == '?');
- }
-
- return next;
-}
-
-/* Obtain the next character, after trigraph conversion and skipping
- an arbitrarily long string of escaped newlines. The common case of
- no trigraphs or escaped newlines falls through quickly. On return,
- buffer->backup_to points to where to return to if the character is
- not to be processed. */
-static cppchar_t
-get_effective_char (pfile)
- cpp_reader *pfile;
-{
- cppchar_t next;
- cpp_buffer *buffer = pfile->buffer;
-
- buffer->backup_to = buffer->cur;
- next = *buffer->cur++;
- if (__builtin_expect (next == '?' || next == '\\', 0))
- next = skip_escaped_newlines (pfile);
-
- return next;
-}
-
-/* Skip a C-style block comment. We find the end of the comment by
- seeing if an asterisk is before every '/' we encounter. Returns
- non-zero if comment terminated by EOF, zero otherwise. */
-static int
-skip_block_comment (pfile)
- cpp_reader *pfile;
-{
- cpp_buffer *buffer = pfile->buffer;
- cppchar_t c = EOF, prevc = EOF;
-
- pfile->state.lexing_comment = 1;
- while (buffer->cur != buffer->rlimit)
- {
- prevc = c, c = *buffer->cur++;
-
- /* FIXME: For speed, create a new character class of characters
- of interest inside block comments. */
- if (c == '?' || c == '\\')
- c = skip_escaped_newlines (pfile);
-
- /* People like decorating comments with '*', so check for '/'
- instead for efficiency. */
- if (c == '/')
- {
- if (prevc == '*')
- break;
-
- /* Warn about potential nested comments, but not if the '/'
- comes immediately before the true comment delimiter.
- Don't bother to get it right across escaped newlines. */
- if (CPP_OPTION (pfile, warn_comments)
- && buffer->cur[0] == '*' && buffer->cur[1] != '/')
- cpp_warning_with_line (pfile,
- pfile->line, CPP_BUF_COL (buffer),
- "\"/*\" within comment");
- }
- else if (is_vspace (c))
- handle_newline (pfile);
- else if (c == '\t')
- adjust_column (pfile);
- }
-
- pfile->state.lexing_comment = 0;
- return c != '/' || prevc != '*';
-}
-
-/* Skip a C++ line comment, leaving buffer->cur pointing to the
- terminating newline. Handles escaped newlines. Returns non-zero
- if a multiline comment. */
-static int
-skip_line_comment (pfile)
- cpp_reader *pfile;
-{
- cpp_buffer *buffer = pfile->buffer;
- unsigned int orig_line = pfile->line;
- cppchar_t c;
-
- pfile->state.lexing_comment = 1;
- do
- {
- if (buffer->cur == buffer->rlimit)
- goto at_eof;
-
- c = *buffer->cur++;
- if (c == '?' || c == '\\')
- c = skip_escaped_newlines (pfile);
- }
- while (!is_vspace (c));
-
- /* Step back over the newline, except at EOF. */
- buffer->cur--;
- at_eof:
-
- pfile->state.lexing_comment = 0;
- return orig_line != pfile->line;
-}
-
-/* pfile->buffer->cur is one beyond the \t character. Update
- col_adjust so we track the column correctly. */
-static void
-adjust_column (pfile)
- cpp_reader *pfile;
-{
- cpp_buffer *buffer = pfile->buffer;
- unsigned int col = CPP_BUF_COL (buffer) - 1; /* Zero-based column. */
-
- /* Round it up to multiple of the tabstop, but subtract 1 since the
- tab itself occupies a character position. */
- buffer->col_adjust += (CPP_OPTION (pfile, tabstop)
- - col % CPP_OPTION (pfile, tabstop)) - 1;
-}
-
-/* Skips whitespace, saving the next non-whitespace character.
- Adjusts pfile->col_adjust to account for tabs. Without this,
- tokens might be assigned an incorrect column. */
-static int
-skip_whitespace (pfile, c)
- cpp_reader *pfile;
- cppchar_t c;
-{
- cpp_buffer *buffer = pfile->buffer;
- unsigned int warned = 0;
-
- do
- {
- /* Horizontal space always OK. */
- if (c == ' ')
- ;
- else if (c == '\t')
- adjust_column (pfile);
- /* Just \f \v or \0 left. */
- else if (c == '\0')
- {
- if (buffer->cur - 1 == buffer->rlimit)
- return 0;
- if (!warned)
- {
- cpp_warning (pfile, "null character(s) ignored");
- warned = 1;
- }
- }
- else if (pfile->state.in_directive && CPP_PEDANTIC (pfile))
- cpp_pedwarn_with_line (pfile, pfile->line,
- CPP_BUF_COL (buffer),
- "%s in preprocessing directive",
- c == '\f' ? "form feed" : "vertical tab");
-
- c = *buffer->cur++;
- }
- /* We only want non-vertical space, i.e. ' ' \t \f \v \0. */
- while (is_nvspace (c));
-
- buffer->cur--;
- return 1;
-}
-
-/* See if the characters of a number token are valid in a name (no
- '.', '+' or '-'). */
-static int
-name_p (pfile, string)
- cpp_reader *pfile;
- const cpp_string *string;
-{
- unsigned int i;
-
- for (i = 0; i < string->len; i++)
- if (!is_idchar (string->text[i]))
- return 0;
-
- return 1;
-}
-
-/* Parse an identifier, skipping embedded backslash-newlines. This is
- a critical inner loop. The common case is an identifier which has
- not been split by backslash-newline, does not contain a dollar
- sign, and has already been scanned (roughly 10:1 ratio of
- seen:unseen identifiers in normal code; the distribution is
- Poisson-like). Second most common case is a new identifier, not
- split and no dollar sign. The other possibilities are rare and
- have been relegated to parse_identifier_slow. */
-static cpp_hashnode *
-parse_identifier (pfile)
- cpp_reader *pfile;
-{
- cpp_hashnode *result;
- const U_CHAR *cur;
-
- /* Fast-path loop. Skim over a normal identifier.
- N.B. ISIDNUM does not include $. */
- cur = pfile->buffer->cur;
- while (ISIDNUM (*cur))
- cur++;
-
- /* Check for slow-path cases. */
- if (*cur == '?' || *cur == '\\' || *cur == '$')
- result = parse_identifier_slow (pfile, cur);
- else
- {
- const U_CHAR *base = pfile->buffer->cur - 1;
- result = (cpp_hashnode *)
- ht_lookup (pfile->hash_table, base, cur - base, HT_ALLOC);
- pfile->buffer->cur = cur;
- }
-
- /* Rarely, identifiers require diagnostics when lexed.
- XXX Has to be forced out of the fast path. */
- if (__builtin_expect ((result->flags & NODE_DIAGNOSTIC)
- && !pfile->state.skipping, 0))
- {
- /* It is allowed to poison the same identifier twice. */
- if ((result->flags & NODE_POISONED) && !pfile->state.poisoned_ok)
- cpp_error (pfile, "attempt to use poisoned \"%s\"",
- NODE_NAME (result));
-
- /* Constraint 6.10.3.5: __VA_ARGS__ should only appear in the
- replacement list of a variadic macro. */
- if (result == pfile->spec_nodes.n__VA_ARGS__
- && !pfile->state.va_args_ok)
- cpp_pedwarn (pfile,
- "__VA_ARGS__ can only appear in the expansion of a C99 variadic macro");
- }
-
- return result;
-}
-
-/* Slow path. This handles identifiers which have been split, and
- identifiers which contain dollar signs. The part of the identifier
- from PFILE->buffer->cur-1 to CUR has already been scanned. */
-static cpp_hashnode *
-parse_identifier_slow (pfile, cur)
- cpp_reader *pfile;
- const U_CHAR *cur;
-{
- cpp_buffer *buffer = pfile->buffer;
- const U_CHAR *base = buffer->cur - 1;
- struct obstack *stack = &pfile->hash_table->stack;
- unsigned int c, saw_dollar = 0, len;
-
- /* Copy the part of the token which is known to be okay. */
- obstack_grow (stack, base, cur - base);
-
- /* Now process the part which isn't. We are looking at one of
- '$', '\\', or '?' on entry to this loop. */
- c = *cur++;
- buffer->cur = cur;
- do
- {
- while (is_idchar (c))
- {
- obstack_1grow (stack, c);
-
- if (c == '$')
- saw_dollar++;
-
- c = *buffer->cur++;
- }
-
- /* Potential escaped newline? */
- buffer->backup_to = buffer->cur - 1;
- if (c != '?' && c != '\\')
- break;
- c = skip_escaped_newlines (pfile);
- }
- while (is_idchar (c));
-
- /* Step back over the unwanted char. */
- BACKUP ();
-
- /* $ is not an identifier character in the standard, but is commonly
- accepted as an extension. Don't warn about it in skipped
- conditional blocks. */
- if (saw_dollar && CPP_PEDANTIC (pfile) && ! pfile->state.skipping)
- cpp_pedwarn (pfile, "'$' character(s) in identifier");
-
- /* Identifiers are null-terminated. */
- len = obstack_object_size (stack);
- obstack_1grow (stack, '\0');
-
- return (cpp_hashnode *)
- ht_lookup (pfile->hash_table, obstack_finish (stack), len, HT_ALLOCED);
-}
-
-/* Parse a number, beginning with character C, skipping embedded
- backslash-newlines. LEADING_PERIOD is non-zero if there was a "."
- before C. Place the result in NUMBER. */
-static void
-parse_number (pfile, number, c, leading_period)
- cpp_reader *pfile;
- cpp_string *number;
- cppchar_t c;
- int leading_period;
-{
- cpp_buffer *buffer = pfile->buffer;
- unsigned char *dest, *limit;
-
- dest = BUFF_FRONT (pfile->u_buff);
- limit = BUFF_LIMIT (pfile->u_buff);
-
- /* Place a leading period. */
- if (leading_period)
- {
- if (dest == limit)
- {
- _cpp_extend_buff (pfile, &pfile->u_buff, 1);
- dest = BUFF_FRONT (pfile->u_buff);
- limit = BUFF_LIMIT (pfile->u_buff);
- }
- *dest++ = '.';
- }
-
- do
- {
- do
- {
- /* Need room for terminating null. */
- if ((size_t) (limit - dest) < 2)
- {
- size_t len_so_far = dest - BUFF_FRONT (pfile->u_buff);
- _cpp_extend_buff (pfile, &pfile->u_buff, 2);
- dest = BUFF_FRONT (pfile->u_buff) + len_so_far;
- limit = BUFF_LIMIT (pfile->u_buff);
- }
- *dest++ = c;
-
- c = *buffer->cur++;
- }
- while (is_numchar (c) || c == '.' || VALID_SIGN (c, dest[-1]));
-
- /* Potential escaped newline? */
- buffer->backup_to = buffer->cur - 1;
- if (c != '?' && c != '\\')
- break;
- c = skip_escaped_newlines (pfile);
- }
- while (is_numchar (c) || c == '.' || VALID_SIGN (c, dest[-1]));
-
- /* Step back over the unwanted char. */
- BACKUP ();
-
- /* Null-terminate the number. */
- *dest = '\0';
-
- number->text = BUFF_FRONT (pfile->u_buff);
- number->len = dest - number->text;
- BUFF_FRONT (pfile->u_buff) = dest + 1;
-}
-
-/* Subroutine of parse_string. Emits error for unterminated strings. */
-static void
-unterminated (pfile, term)
- cpp_reader *pfile;
- int term;
-{
- cpp_error (pfile, "missing terminating %c character", term);
-
- if (term == '\"' && pfile->mls_line && pfile->mls_line != pfile->line)
- {
- cpp_error_with_line (pfile, pfile->mls_line, pfile->mls_col,
- "possible start of unterminated string literal");
- pfile->mls_line = 0;
- }
-}
-
-/* Subroutine of parse_string. */
-static int
-unescaped_terminator_p (pfile, dest)
- cpp_reader *pfile;
- const unsigned char *dest;
-{
- const unsigned char *start, *temp;
-
- /* In #include-style directives, terminators are not escapeable. */
- if (pfile->state.angled_headers)
- return 1;
-
- start = BUFF_FRONT (pfile->u_buff);
-
- /* An odd number of consecutive backslashes represents an escaped
- terminator. */
- for (temp = dest; temp > start && temp[-1] == '\\'; temp--)
- ;
-
- return ((dest - temp) & 1) == 0;
-}
-
-/* Parses a string, character constant, or angle-bracketed header file
- name. Handles embedded trigraphs and escaped newlines. The stored
- string is guaranteed NUL-terminated, but it is not guaranteed that
- this is the first NUL since embedded NULs are preserved.
- Multi-line strings are allowed, but they are deprecated.
-
- When this function returns, buffer->cur points to the next
- character to be processed. */
-static void
-parse_string (pfile, token, terminator)
- cpp_reader *pfile;
- cpp_token *token;
- cppchar_t terminator;
-{
- cpp_buffer *buffer = pfile->buffer;
- unsigned char *dest, *limit;
- cppchar_t c;
- bool warned_nulls = false, warned_multi = false;
-
- dest = BUFF_FRONT (pfile->u_buff);
- limit = BUFF_LIMIT (pfile->u_buff);
-
- for (;;)
- {
- /* We need room for another char, possibly the terminating NUL. */
- if ((size_t) (limit - dest) < 1)
- {
- size_t len_so_far = dest - BUFF_FRONT (pfile->u_buff);
- _cpp_extend_buff (pfile, &pfile->u_buff, 2);
- dest = BUFF_FRONT (pfile->u_buff) + len_so_far;
- limit = BUFF_LIMIT (pfile->u_buff);
- }
-
- /* Handle trigraphs, escaped newlines etc. */
- c = *buffer->cur++;
- if (c == '?' || c == '\\')
- c = skip_escaped_newlines (pfile);
-
- if (c == terminator)
- {
- if (unescaped_terminator_p (pfile, dest))
- break;
- }
- else if (is_vspace (c))
- {
- /* In assembly language, silently terminate string and
- character literals at end of line. This is a kludge
- around not knowing where comments are. */
- if (CPP_OPTION (pfile, lang) == CLK_ASM && terminator != '>')
- {
- buffer->cur--;
- break;
- }
-
- /* Character constants and header names may not extend over
- multiple lines. In Standard C, neither may strings.
- Unfortunately, we accept multiline strings as an
- extension, except in #include family directives. */
- if (terminator != '"' || pfile->state.angled_headers)
- {
- unterminated (pfile, terminator);
- buffer->cur--;
- break;
- }
-
- if (!warned_multi)
- {
- warned_multi = true;
- cpp_pedwarn (pfile, "multi-line string literals are deprecated");
- }
-
- if (pfile->mls_line == 0)
- {
- pfile->mls_line = token->line;
- pfile->mls_col = token->col;
- }
-
- handle_newline (pfile);
- c = '\n';
- }
- else if (c == '\0')
- {
- if (buffer->cur - 1 == buffer->rlimit)
- {
- unterminated (pfile, terminator);
- buffer->cur--;
- break;
- }
- if (!warned_nulls)
- {
- warned_nulls = true;
- cpp_warning (pfile, "null character(s) preserved in literal");
- }
- }
-
- *dest++ = c;
- }
-
- *dest = '\0';
-
- token->val.str.text = BUFF_FRONT (pfile->u_buff);
- token->val.str.len = dest - BUFF_FRONT (pfile->u_buff);
- BUFF_FRONT (pfile->u_buff) = dest + 1;
-}
-
-/* The stored comment includes the comment start and any terminator. */
-static void
-save_comment (pfile, token, from)
- cpp_reader *pfile;
- cpp_token *token;
- const unsigned char *from;
-{
- unsigned char *buffer;
- unsigned int len;
-
- len = pfile->buffer->cur - from + 1; /* + 1 for the initial '/'. */
-
- /* C++ comments probably (not definitely) have moved past a new
- line, which we don't want to save in the comment. */
- if (is_vspace (pfile->buffer->cur[-1]))
- len--;
- buffer = _cpp_unaligned_alloc (pfile, len);
-
- token->type = CPP_COMMENT;
- token->val.str.len = len;
- token->val.str.text = buffer;
-
- buffer[0] = '/';
- memcpy (buffer + 1, from, len - 1);
-}
-
-/* Allocate COUNT tokens for RUN. */
-void
-_cpp_init_tokenrun (run, count)
- tokenrun *run;
- unsigned int count;
-{
- run->base = xnewvec (cpp_token, count);
- run->limit = run->base + count;
- run->next = NULL;
-}
-
-/* Returns the next tokenrun, or creates one if there is none. */
-static tokenrun *
-next_tokenrun (run)
- tokenrun *run;
-{
- if (run->next == NULL)
- {
- run->next = xnew (tokenrun);
- run->next->prev = run;
- _cpp_init_tokenrun (run->next, 250);
- }
-
- return run->next;
-}
-
-/* Allocate a single token that is invalidated at the same time as the
- rest of the tokens on the line. Has its line and col set to the
- same as the last lexed token, so that diagnostics appear in the
- right place. */
-cpp_token *
-_cpp_temp_token (pfile)
- cpp_reader *pfile;
-{
- cpp_token *old, *result;
-
- old = pfile->cur_token - 1;
- if (pfile->cur_token == pfile->cur_run->limit)
- {
- pfile->cur_run = next_tokenrun (pfile->cur_run);
- pfile->cur_token = pfile->cur_run->base;
- }
-
- result = pfile->cur_token++;
- result->line = old->line;
- result->col = old->col;
- return result;
-}
-
-/* Lex a token into RESULT (external interface). Takes care of issues
- like directive handling, token lookahead, multiple include
- optimization and skipping. */
-const cpp_token *
-_cpp_lex_token (pfile)
- cpp_reader *pfile;
-{
- cpp_token *result;
-
- for (;;)
- {
- if (pfile->cur_token == pfile->cur_run->limit)
- {
- pfile->cur_run = next_tokenrun (pfile->cur_run);
- pfile->cur_token = pfile->cur_run->base;
- }
-
- if (pfile->lookaheads)
- {
- pfile->lookaheads--;
- result = pfile->cur_token++;
- }
- else
- result = _cpp_lex_direct (pfile);
-
- if (result->flags & BOL)
- {
- /* Is this a directive. If _cpp_handle_directive returns
- false, it is an assembler #. */
- if (result->type == CPP_HASH
- && !pfile->state.parsing_args
- && _cpp_handle_directive (pfile, result->flags & PREV_WHITE))
- continue;
- if (pfile->cb.line_change && !pfile->state.skipping)
- (*pfile->cb.line_change)(pfile, result, pfile->state.parsing_args);
- }
-
- /* We don't skip tokens in directives. */
- if (pfile->state.in_directive)
- break;
-
- /* Outside a directive, invalidate controlling macros. At file
- EOF, _cpp_lex_direct takes care of popping the buffer, so we never
- get here and MI optimisation works. */
- pfile->mi_valid = false;
-
- if (!pfile->state.skipping || result->type == CPP_EOF)
- break;
- }
-
- return result;
-}
-
-#define IF_NEXT_IS(CHAR, THEN_TYPE, ELSE_TYPE) \
- do { \
- if (get_effective_char (pfile) == CHAR) \
- result->type = THEN_TYPE; \
- else \
- { \
- BACKUP (); \
- result->type = ELSE_TYPE; \
- } \
- } while (0)
-
-/* Lex a token into pfile->cur_token, which is also incremented, to
- get diagnostics pointing to the correct location.
-
- Does not handle issues such as token lookahead, multiple-include
- optimisation, directives, skipping etc. This function is only
- suitable for use by _cpp_lex_token, and in special cases like
- lex_expansion_token which doesn't care for any of these issues.
-
- When meeting a newline, returns CPP_EOF if parsing a directive,
- otherwise returns to the start of the token buffer if permissible.
- Returns the location of the lexed token. */
-cpp_token *
-_cpp_lex_direct (pfile)
- cpp_reader *pfile;
-{
- cppchar_t c;
- cpp_buffer *buffer;
- const unsigned char *comment_start;
- cpp_token *result = pfile->cur_token++;
-
- fresh_line:
- buffer = pfile->buffer;
- result->flags = buffer->saved_flags;
- buffer->saved_flags = 0;
- update_tokens_line:
- result->line = pfile->line;
-
- skipped_white:
- c = *buffer->cur++;
- result->col = CPP_BUF_COLUMN (buffer, buffer->cur);
-
- trigraph:
- switch (c)
- {
- case ' ': case '\t': case '\f': case '\v': case '\0':
- result->flags |= PREV_WHITE;
- if (skip_whitespace (pfile, c))
- goto skipped_white;
-
- /* EOF. */
- buffer->cur--;
- buffer->saved_flags = BOL;
- if (!pfile->state.parsing_args && !pfile->state.in_directive)
- {
- if (buffer->cur != buffer->line_base)
- {
- /* Non-empty files should end in a newline. Don't warn
- for command line and _Pragma buffers. */
- if (!buffer->from_stage3)
- cpp_pedwarn (pfile, "no newline at end of file");
- handle_newline (pfile);
- }
-
- /* Don't pop the last buffer. */
- if (buffer->prev)
- {
- unsigned char stop = buffer->return_at_eof;
-
- _cpp_pop_buffer (pfile);
- if (!stop)
- goto fresh_line;
- }
- }
- result->type = CPP_EOF;
- break;
-
- case '\n': case '\r':
- handle_newline (pfile);
- buffer->saved_flags = BOL;
- if (! pfile->state.in_directive)
- {
- if (pfile->state.parsing_args == 2)
- buffer->saved_flags |= PREV_WHITE;
- if (!pfile->keep_tokens)
- {
- pfile->cur_run = &pfile->base_run;
- result = pfile->base_run.base;
- pfile->cur_token = result + 1;
- }
- goto fresh_line;
- }
- result->type = CPP_EOF;
- break;
-
- case '?':
- case '\\':
- /* These could start an escaped newline, or '?' a trigraph. Let
- skip_escaped_newlines do all the work. */
- {
- unsigned int line = pfile->line;
-
- c = skip_escaped_newlines (pfile);
- if (line != pfile->line)
- {
- buffer->cur--;
- /* We had at least one escaped newline of some sort.
- Update the token's line and column. */
- goto update_tokens_line;
- }
- }
-
- /* We are either the original '?' or '\\', or a trigraph. */
- if (c == '?')
- result->type = CPP_QUERY;
- else if (c == '\\')
- goto random_char;
- else
- goto trigraph;
- break;
-
- case '0': case '1': case '2': case '3': case '4':
- case '5': case '6': case '7': case '8': case '9':
- result->type = CPP_NUMBER;
- parse_number (pfile, &result->val.str, c, 0);
- break;
-
- case 'L':
- /* 'L' may introduce wide characters or strings. */
- {
- const unsigned char *pos = buffer->cur;
-
- c = get_effective_char (pfile);
- if (c == '\'' || c == '"')
- {
- result->type = (c == '"' ? CPP_WSTRING: CPP_WCHAR);
- parse_string (pfile, result, c);
- break;
- }
- buffer->cur = pos;
- }
- /* Fall through. */
-
- start_ident:
- case '_':
- case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
- case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
- case 'm': case 'n': case 'o': case 'p': case 'q': case 'r':
- case 's': case 't': case 'u': case 'v': case 'w': case 'x':
- case 'y': case 'z':
- case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
- case 'G': case 'H': case 'I': case 'J': case 'K':
- case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
- case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
- case 'Y': case 'Z':
- result->type = CPP_NAME;
- result->val.node = parse_identifier (pfile);
-
- /* Convert named operators to their proper types. */
- if (result->val.node->flags & NODE_OPERATOR)
- {
- result->flags |= NAMED_OP;
- result->type = result->val.node->value.operator;
- }
- break;
-
- case '\'':
- case '"':
- result->type = c == '"' ? CPP_STRING: CPP_CHAR;
- parse_string (pfile, result, c);
- break;
-
- case '/':
- /* A potential block or line comment. */
- comment_start = buffer->cur;
- c = get_effective_char (pfile);
-
- if (c == '*')
- {
- if (skip_block_comment (pfile))
- cpp_error (pfile, "unterminated comment");
- }
- else if (c == '/' && (CPP_OPTION (pfile, cplusplus_comments)
- || CPP_IN_SYSTEM_HEADER (pfile)))
- {
- /* Warn about comments only if pedantically GNUC89, and not
- in system headers. */
- if (CPP_OPTION (pfile, lang) == CLK_GNUC89 && CPP_PEDANTIC (pfile)
- && ! buffer->warned_cplusplus_comments)
- {
- cpp_pedwarn (pfile,
- "C++ style comments are not allowed in ISO C89");
- cpp_pedwarn (pfile,
- "(this will be reported only once per input file)");
- buffer->warned_cplusplus_comments = 1;
- }
-
- if (skip_line_comment (pfile) && CPP_OPTION (pfile, warn_comments))
- cpp_warning (pfile, "multi-line comment");
- }
- else if (c == '=')
- {
- result->type = CPP_DIV_EQ;
- break;
- }
- else
- {
- BACKUP ();
- result->type = CPP_DIV;
- break;
- }
-
- if (!pfile->state.save_comments)
- {
- result->flags |= PREV_WHITE;
- goto update_tokens_line;
- }
-
- /* Save the comment as a token in its own right. */
- save_comment (pfile, result, comment_start);
- break;
-
- case '<':
- if (pfile->state.angled_headers)
- {
- result->type = CPP_HEADER_NAME;
- parse_string (pfile, result, '>');
- break;
- }
-
- c = get_effective_char (pfile);
- if (c == '=')
- result->type = CPP_LESS_EQ;
- else if (c == '<')
- IF_NEXT_IS ('=', CPP_LSHIFT_EQ, CPP_LSHIFT);
- else if (c == '?' && CPP_OPTION (pfile, cplusplus))
- IF_NEXT_IS ('=', CPP_MIN_EQ, CPP_MIN);
- else if (c == ':' && CPP_OPTION (pfile, digraphs))
- {
- result->type = CPP_OPEN_SQUARE;
- result->flags |= DIGRAPH;
- }
- else if (c == '%' && CPP_OPTION (pfile, digraphs))
- {
- result->type = CPP_OPEN_BRACE;
- result->flags |= DIGRAPH;
- }
- else
- {
- BACKUP ();
- result->type = CPP_LESS;
- }
- break;
-
- case '>':
- c = get_effective_char (pfile);
- if (c == '=')
- result->type = CPP_GREATER_EQ;
- else if (c == '>')
- IF_NEXT_IS ('=', CPP_RSHIFT_EQ, CPP_RSHIFT);
- else if (c == '?' && CPP_OPTION (pfile, cplusplus))
- IF_NEXT_IS ('=', CPP_MAX_EQ, CPP_MAX);
- else
- {
- BACKUP ();
- result->type = CPP_GREATER;
- }
- break;
-
- case '%':
- c = get_effective_char (pfile);
- if (c == '=')
- result->type = CPP_MOD_EQ;
- else if (CPP_OPTION (pfile, digraphs) && c == ':')
- {
- result->flags |= DIGRAPH;
- result->type = CPP_HASH;
- if (get_effective_char (pfile) == '%')
- {
- const unsigned char *pos = buffer->cur;
-
- if (get_effective_char (pfile) == ':')
- result->type = CPP_PASTE;
- else
- buffer->cur = pos - 1;
- }
- else
- BACKUP ();
- }
- else if (CPP_OPTION (pfile, digraphs) && c == '>')
- {
- result->flags |= DIGRAPH;
- result->type = CPP_CLOSE_BRACE;
- }
- else
- {
- BACKUP ();
- result->type = CPP_MOD;
- }
- break;
-
- case '.':
- result->type = CPP_DOT;
- c = get_effective_char (pfile);
- if (c == '.')
- {
- const unsigned char *pos = buffer->cur;
-
- if (get_effective_char (pfile) == '.')
- result->type = CPP_ELLIPSIS;
- else
- buffer->cur = pos - 1;
- }
- /* All known character sets have 0...9 contiguous. */
- else if (ISDIGIT (c))
- {
- result->type = CPP_NUMBER;
- parse_number (pfile, &result->val.str, c, 1);
- }
- else if (c == '*' && CPP_OPTION (pfile, cplusplus))
- result->type = CPP_DOT_STAR;
- else
- BACKUP ();
- break;
-
- case '+':
- c = get_effective_char (pfile);
- if (c == '+')
- result->type = CPP_PLUS_PLUS;
- else if (c == '=')
- result->type = CPP_PLUS_EQ;
- else
- {
- BACKUP ();
- result->type = CPP_PLUS;
- }
- break;
-
- case '-':
- c = get_effective_char (pfile);
- if (c == '>')
- {
- result->type = CPP_DEREF;
- if (CPP_OPTION (pfile, cplusplus))
- {
- if (get_effective_char (pfile) == '*')
- result->type = CPP_DEREF_STAR;
- else
- BACKUP ();
- }
- }
- else if (c == '-')
- result->type = CPP_MINUS_MINUS;
- else if (c == '=')
- result->type = CPP_MINUS_EQ;
- else
- {
- BACKUP ();
- result->type = CPP_MINUS;
- }
- break;
-
- case '&':
- c = get_effective_char (pfile);
- if (c == '&')
- result->type = CPP_AND_AND;
- else if (c == '=')
- result->type = CPP_AND_EQ;
- else
- {
- BACKUP ();
- result->type = CPP_AND;
- }
- break;
-
- case '|':
- c = get_effective_char (pfile);
- if (c == '|')
- result->type = CPP_OR_OR;
- else if (c == '=')
- result->type = CPP_OR_EQ;
- else
- {
- BACKUP ();
- result->type = CPP_OR;
- }
- break;
-
- case ':':
- c = get_effective_char (pfile);
- if (c == ':' && CPP_OPTION (pfile, cplusplus))
- result->type = CPP_SCOPE;
- else if (c == '>' && CPP_OPTION (pfile, digraphs))
- {
- result->flags |= DIGRAPH;
- result->type = CPP_CLOSE_SQUARE;
- }
- else
- {
- BACKUP ();
- result->type = CPP_COLON;
- }
- break;
-
- case '*': IF_NEXT_IS ('=', CPP_MULT_EQ, CPP_MULT); break;
- case '=': IF_NEXT_IS ('=', CPP_EQ_EQ, CPP_EQ); break;
- case '!': IF_NEXT_IS ('=', CPP_NOT_EQ, CPP_NOT); break;
- case '^': IF_NEXT_IS ('=', CPP_XOR_EQ, CPP_XOR); break;
- case '#': IF_NEXT_IS ('#', CPP_PASTE, CPP_HASH); break;
-
- case '~': result->type = CPP_COMPL; break;
- case ',': result->type = CPP_COMMA; break;
- case '(': result->type = CPP_OPEN_PAREN; break;
- case ')': result->type = CPP_CLOSE_PAREN; break;
- case '[': result->type = CPP_OPEN_SQUARE; break;
- case ']': result->type = CPP_CLOSE_SQUARE; break;
- case '{': result->type = CPP_OPEN_BRACE; break;
- case '}': result->type = CPP_CLOSE_BRACE; break;
- case ';': result->type = CPP_SEMICOLON; break;
-
- /* @ is a punctuator in Objective C. */
- case '@': result->type = CPP_ATSIGN; break;
-
- case '$':
- if (CPP_OPTION (pfile, dollars_in_ident))
- goto start_ident;
- /* Fall through... */
-
- random_char:
- default:
- result->type = CPP_OTHER;
- result->val.c = c;
- break;
- }
-
- return result;
-}
-
-/* An upper bound on the number of bytes needed to spell TOKEN,
- including preceding whitespace. */
-unsigned int
-cpp_token_len (token)
- const cpp_token *token;
-{
- unsigned int len;
-
- switch (TOKEN_SPELL (token))
- {
- default: len = 0; break;
- case SPELL_NUMBER:
- case SPELL_STRING: len = token->val.str.len; break;
- case SPELL_IDENT: len = NODE_LEN (token->val.node); break;
- }
- /* 1 for whitespace, 4 for comment delimiters. */
- return len + 5;
-}
-
-/* Write the spelling of a token TOKEN to BUFFER. The buffer must
- already contain the enough space to hold the token's spelling.
- Returns a pointer to the character after the last character
- written. */
-unsigned char *
-cpp_spell_token (pfile, token, buffer)
- cpp_reader *pfile; /* Would be nice to be rid of this... */
- const cpp_token *token;
- unsigned char *buffer;
-{
- switch (TOKEN_SPELL (token))
- {
- case SPELL_OPERATOR:
- {
- const unsigned char *spelling;
- unsigned char c;
-
- if (token->flags & DIGRAPH)
- spelling
- = digraph_spellings[(int) token->type - (int) CPP_FIRST_DIGRAPH];
- else if (token->flags & NAMED_OP)
- goto spell_ident;
- else
- spelling = TOKEN_NAME (token);
-
- while ((c = *spelling++) != '\0')
- *buffer++ = c;
- }
- break;
-
- case SPELL_CHAR:
- *buffer++ = token->val.c;
- break;
-
- spell_ident:
- case SPELL_IDENT:
- memcpy (buffer, NODE_NAME (token->val.node), NODE_LEN (token->val.node));
- buffer += NODE_LEN (token->val.node);
- break;
-
- case SPELL_NUMBER:
- memcpy (buffer, token->val.str.text, token->val.str.len);
- buffer += token->val.str.len;
- break;
-
- case SPELL_STRING:
- {
- int left, right, tag;
- switch (token->type)
- {
- case CPP_STRING: left = '"'; right = '"'; tag = '\0'; break;
- case CPP_WSTRING: left = '"'; right = '"'; tag = 'L'; break;
- case CPP_CHAR: left = '\''; right = '\''; tag = '\0'; break;
- case CPP_WCHAR: left = '\''; right = '\''; tag = 'L'; break;
- case CPP_HEADER_NAME: left = '<'; right = '>'; tag = '\0'; break;
- default:
- cpp_ice (pfile, "unknown string token %s\n", TOKEN_NAME (token));
- return buffer;
- }
- if (tag) *buffer++ = tag;
- *buffer++ = left;
- memcpy (buffer, token->val.str.text, token->val.str.len);
- buffer += token->val.str.len;
- *buffer++ = right;
- }
- break;
-
- case SPELL_NONE:
- cpp_ice (pfile, "unspellable token %s", TOKEN_NAME (token));
- break;
- }
-
- return buffer;
-}
-
-/* Returns TOKEN spelt as a null-terminated string. The string is
- freed when the reader is destroyed. Useful for diagnostics. */
-unsigned char *
-cpp_token_as_text (pfile, token)
- cpp_reader *pfile;
- const cpp_token *token;
-{
- unsigned int len = cpp_token_len (token);
- unsigned char *start = _cpp_unaligned_alloc (pfile, len), *end;
-
- end = cpp_spell_token (pfile, token, start);
- end[0] = '\0';
-
- return start;
-}
-
-/* Used by C front ends, which really should move to using
- cpp_token_as_text. */
-const char *
-cpp_type2name (type)
- enum cpp_ttype type;
-{
- return (const char *) token_spellings[type].name;
-}
-
-/* Writes the spelling of token to FP, without any preceding space.
- Separated from cpp_spell_token for efficiency - to avoid stdio
- double-buffering. */
-void
-cpp_output_token (token, fp)
- const cpp_token *token;
- FILE *fp;
-{
- switch (TOKEN_SPELL (token))
- {
- case SPELL_OPERATOR:
- {
- const unsigned char *spelling;
- int c;
-
- if (token->flags & DIGRAPH)
- spelling
- = digraph_spellings[(int) token->type - (int) CPP_FIRST_DIGRAPH];
- else if (token->flags & NAMED_OP)
- goto spell_ident;
- else
- spelling = TOKEN_NAME (token);
-
- c = *spelling;
- do
- putc (c, fp);
- while ((c = *++spelling) != '\0');
- }
- break;
-
- case SPELL_CHAR:
- putc (token->val.c, fp);
- break;
-
- spell_ident:
- case SPELL_IDENT:
- fwrite (NODE_NAME (token->val.node), 1, NODE_LEN (token->val.node), fp);
- break;
-
- case SPELL_NUMBER:
- fwrite (token->val.str.text, 1, token->val.str.len, fp);
- break;
-
- case SPELL_STRING:
- {
- int left, right, tag;
- switch (token->type)
- {
- case CPP_STRING: left = '"'; right = '"'; tag = '\0'; break;
- case CPP_WSTRING: left = '"'; right = '"'; tag = 'L'; break;
- case CPP_CHAR: left = '\''; right = '\''; tag = '\0'; break;
- case CPP_WCHAR: left = '\''; right = '\''; tag = 'L'; break;
- case CPP_HEADER_NAME: left = '<'; right = '>'; tag = '\0'; break;
- default:
- fprintf (stderr, "impossible STRING token %s\n", TOKEN_NAME (token));
- return;
- }
- if (tag) putc (tag, fp);
- putc (left, fp);
- fwrite (token->val.str.text, 1, token->val.str.len, fp);
- putc (right, fp);
- }
- break;
-
- case SPELL_NONE:
- /* An error, most probably. */
- break;
- }
-}
-
-/* Compare two tokens. */
-int
-_cpp_equiv_tokens (a, b)
- const cpp_token *a, *b;
-{
- if (a->type == b->type && a->flags == b->flags)
- switch (TOKEN_SPELL (a))
- {
- default: /* Keep compiler happy. */
- case SPELL_OPERATOR:
- return 1;
- case SPELL_CHAR:
- return a->val.c == b->val.c; /* Character. */
- case SPELL_NONE:
- return (a->type != CPP_MACRO_ARG || a->val.arg_no == b->val.arg_no);
- case SPELL_IDENT:
- return a->val.node == b->val.node;
- case SPELL_NUMBER:
- 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));
- }
-
- return 0;
-}
-
-/* Returns nonzero if a space should be inserted to avoid an
- accidental token paste for output. For simplicity, it is
- conservative, and occasionally advises a space where one is not
- needed, e.g. "." and ".2". */
-int
-cpp_avoid_paste (pfile, token1, token2)
- cpp_reader *pfile;
- const cpp_token *token1, *token2;
-{
- enum cpp_ttype a = token1->type, b = token2->type;
- cppchar_t c;
-
- if (token1->flags & NAMED_OP)
- a = CPP_NAME;
- if (token2->flags & NAMED_OP)
- b = CPP_NAME;
-
- c = EOF;
- if (token2->flags & DIGRAPH)
- c = digraph_spellings[(int) b - (int) CPP_FIRST_DIGRAPH][0];
- else if (token_spellings[b].category == SPELL_OPERATOR)
- c = token_spellings[b].name[0];
-
- /* Quickly get everything that can paste with an '='. */
- if ((int) a <= (int) CPP_LAST_EQ && c == '=')
- return 1;
-
- switch (a)
- {
- case CPP_GREATER: return c == '>' || c == '?';
- case CPP_LESS: return c == '<' || c == '?' || c == '%' || c == ':';
- case CPP_PLUS: return c == '+';
- case CPP_MINUS: return c == '-' || c == '>';
- case CPP_DIV: return c == '/' || c == '*'; /* Comments. */
- case CPP_MOD: return c == ':' || c == '>';
- case CPP_AND: return c == '&';
- case CPP_OR: return c == '|';
- case CPP_COLON: return c == ':' || c == '>';
- case CPP_DEREF: return c == '*';
- case CPP_DOT: return c == '.' || c == '%' || b == CPP_NUMBER;
- case CPP_HASH: return c == '#' || c == '%'; /* Digraph form. */
- case CPP_NAME: return ((b == CPP_NUMBER
- && name_p (pfile, &token2->val.str))
- || b == CPP_NAME
- || b == CPP_CHAR || b == CPP_STRING); /* L */
- case CPP_NUMBER: return (b == CPP_NUMBER || b == CPP_NAME
- || c == '.' || c == '+' || c == '-');
- case CPP_OTHER: return (CPP_OPTION (pfile, objc)
- && token1->val.c == '@'
- && (b == CPP_NAME || b == CPP_STRING));
- default: break;
- }
-
- return 0;
-}
-
-/* Output all the remaining tokens on the current line, and a newline
- character, to FP. Leading whitespace is removed. If there are
- macros, special token padding is not performed. */
-void
-cpp_output_line (pfile, fp)
- cpp_reader *pfile;
- FILE *fp;
-{
- const cpp_token *token;
-
- token = cpp_get_token (pfile);
- while (token->type != CPP_EOF)
- {
- cpp_output_token (token, fp);
- token = cpp_get_token (pfile);
- if (token->flags & PREV_WHITE)
- putc (' ', fp);
- }
-
- putc ('\n', fp);
-}
-
-/* Returns the value of a hexadecimal digit. */
-static unsigned int
-hex_digit_value (c)
- unsigned int c;
-{
- if (hex_p (c))
- return hex_value (c);
- else
- abort ();
-}
-
-/* Parse a '\uNNNN' or '\UNNNNNNNN' sequence. Returns 1 to indicate
- failure if cpplib is not parsing C++ or C99. Such failure is
- silent, and no variables are updated. Otherwise returns 0, and
- warns if -Wtraditional.
-
- [lex.charset]: The character designated by the universal character
- name \UNNNNNNNN is that character whose character short name in
- ISO/IEC 10646 is NNNNNNNN; the character designated by the
- universal character name \uNNNN is that character whose character
- short name in ISO/IEC 10646 is 0000NNNN. If the hexadecimal value
- for a universal character name is less than 0x20 or in the range
- 0x7F-0x9F (inclusive), or if the universal character name
- designates a character in the basic source character set, then the
- program is ill-formed.
-
- We assume that wchar_t is Unicode, so we don't need to do any
- mapping. Is this ever wrong?
-
- PC points to the 'u' or 'U', PSTR is points to the byte after PC,
- LIMIT is the end of the string or charconst. PSTR is updated to
- point after the UCS on return, and the UCS is written into PC. */
-
-static int
-maybe_read_ucs (pfile, pstr, limit, pc)
- cpp_reader *pfile;
- const unsigned char **pstr;
- const unsigned char *limit;
- unsigned int *pc;
-{
- const unsigned char *p = *pstr;
- unsigned int code = 0;
- unsigned int c = *pc, length;
-
- /* Only attempt to interpret a UCS for C++ and C99. */
- if (! (CPP_OPTION (pfile, cplusplus) || CPP_OPTION (pfile, c99)))
- return 1;
-
- if (CPP_WTRADITIONAL (pfile))
- cpp_warning (pfile, "the meaning of '\\%c' varies with -traditional", c);
-
- length = (c == 'u' ? 4: 8);
-
- if ((size_t) (limit - p) < length)
- {
- cpp_error (pfile, "incomplete universal-character-name");
- /* Skip to the end to avoid more diagnostics. */
- p = limit;
- }
- else
- {
- for (; length; length--, p++)
- {
- c = *p;
- if (ISXDIGIT (c))
- code = (code << 4) + hex_digit_value (c);
- else
- {
- cpp_error (pfile,
- "non-hex digit '%c' in universal-character-name", c);
- /* We shouldn't skip in case there are multibyte chars. */
- break;
- }
- }
- }
-
-#ifdef TARGET_EBCDIC
- cpp_error (pfile, "universal-character-name on EBCDIC target");
- code = 0x3f; /* EBCDIC invalid character */
-#else
- /* True extended characters are OK. */
- if (code >= 0xa0
- && !(code & 0x80000000)
- && !(code >= 0xD800 && code <= 0xDFFF))
- ;
- /* The standard permits $, @ and ` to be specified as UCNs. We use
- hex escapes so that this also works with EBCDIC hosts. */
- else if (code == 0x24 || code == 0x40 || code == 0x60)
- ;
- /* Don't give another error if one occurred above. */
- else if (length == 0)
- cpp_error (pfile, "universal-character-name out of range");
-#endif
-
- *pstr = p;
- *pc = code;
- return 0;
-}
-
-/* Interpret an escape sequence, and return its value. PSTR points to
- the input pointer, which is just after the backslash. LIMIT is how
- much text we have. MASK is a bitmask for the precision for the
- destination type (char or wchar_t). TRADITIONAL, if true, does not
- interpret escapes that did not exist in traditional C.
-
- Handles all relevant diagnostics. */
-unsigned int
-cpp_parse_escape (pfile, pstr, limit, mask, traditional)
- cpp_reader *pfile;
- const unsigned char **pstr;
- const unsigned char *limit;
- unsigned HOST_WIDE_INT mask;
- int traditional;
-{
- int unknown = 0;
- const unsigned char *str = *pstr;
- unsigned int c = *str++;
-
- switch (c)
- {
- case '\\': case '\'': case '"': case '?': break;
- case 'b': c = TARGET_BS; break;
- case 'f': c = TARGET_FF; break;
- case 'n': c = TARGET_NEWLINE; break;
- case 'r': c = TARGET_CR; break;
- case 't': c = TARGET_TAB; break;
- case 'v': c = TARGET_VT; break;
-
- case '(': case '{': case '[': case '%':
- /* '\(', etc, are used at beginning of line to avoid confusing Emacs.
- '\%' is used to prevent SCCS from getting confused. */
- unknown = CPP_PEDANTIC (pfile);
- break;
-
- case 'a':
- if (CPP_WTRADITIONAL (pfile))
- cpp_warning (pfile, "the meaning of '\\a' varies with -traditional");
- if (!traditional)
- c = TARGET_BELL;
- break;
-
- case 'e': case 'E':
- if (CPP_PEDANTIC (pfile))
- cpp_pedwarn (pfile, "non-ISO-standard escape sequence, '\\%c'", c);
- c = TARGET_ESC;
- break;
-
- case 'u': case 'U':
- unknown = maybe_read_ucs (pfile, &str, limit, &c);
- break;
-
- case 'x':
- if (CPP_WTRADITIONAL (pfile))
- cpp_warning (pfile, "the meaning of '\\x' varies with -traditional");
-
- if (!traditional)
- {
- unsigned int i = 0, overflow = 0;
- int digits_found = 0;
-
- while (str < limit)
- {
- c = *str;
- if (! ISXDIGIT (c))
- break;
- str++;
- overflow |= i ^ (i << 4 >> 4);
- i = (i << 4) + hex_digit_value (c);
- digits_found = 1;
- }
-
- if (!digits_found)
- cpp_error (pfile, "\\x used with no following hex digits");
-
- if (overflow | (i != (i & mask)))
- {
- cpp_pedwarn (pfile, "hex escape sequence out of range");
- i &= mask;
- }
- c = i;
- }
- break;
-
- case '0': case '1': case '2': case '3':
- case '4': case '5': case '6': case '7':
- {
- unsigned int i = c - '0';
- int count = 0;
-
- while (str < limit && ++count < 3)
- {
- c = *str;
- if (c < '0' || c > '7')
- break;
- str++;
- i = (i << 3) + c - '0';
- }
-
- if (i != (i & mask))
- {
- cpp_pedwarn (pfile, "octal escape sequence out of range");
- i &= mask;
- }
- c = i;
- }
- break;
-
- default:
- unknown = 1;
- break;
- }
-
- if (unknown)
- {
- if (ISGRAPH (c))
- cpp_pedwarn (pfile, "unknown escape sequence '\\%c'", c);
- else
- cpp_pedwarn (pfile, "unknown escape sequence: '\\%03o'", c);
- }
-
- if (c > mask)
- cpp_pedwarn (pfile, "escape sequence out of range for character");
-
- *pstr = str;
- return c;
-}
-
-#ifndef MAX_CHAR_TYPE_SIZE
-#define MAX_CHAR_TYPE_SIZE CHAR_TYPE_SIZE
-#endif
-
-#ifndef MAX_WCHAR_TYPE_SIZE
-#define MAX_WCHAR_TYPE_SIZE WCHAR_TYPE_SIZE
-#endif
-
-/* Interpret a (possibly wide) character constant in TOKEN.
- WARN_MULTI warns about multi-character charconsts, if not
- TRADITIONAL. TRADITIONAL also indicates not to interpret escapes
- that did not exist in traditional C. PCHARS_SEEN points to a
- variable that is filled in with the number of characters seen. */
-HOST_WIDE_INT
-cpp_interpret_charconst (pfile, token, warn_multi, traditional, pchars_seen)
- cpp_reader *pfile;
- const cpp_token *token;
- int warn_multi;
- int traditional;
- unsigned int *pchars_seen;
-{
- const unsigned char *str = token->val.str.text;
- const unsigned char *limit = str + token->val.str.len;
- unsigned int chars_seen = 0;
- unsigned int width, max_chars, c;
- unsigned HOST_WIDE_INT mask;
- HOST_WIDE_INT result = 0;
- bool unsigned_p;
-
-#ifdef MULTIBYTE_CHARS
- (void) local_mbtowc (NULL, NULL, 0);
-#endif
-
- /* Width in bits. */
- if (token->type == CPP_CHAR)
- {
- width = MAX_CHAR_TYPE_SIZE;
- unsigned_p = CPP_OPTION (pfile, signed_char) == 0;
- }
- else
- {
- width = MAX_WCHAR_TYPE_SIZE;
- unsigned_p = WCHAR_UNSIGNED;
- }
-
- if (width < HOST_BITS_PER_WIDE_INT)
- mask = ((unsigned HOST_WIDE_INT) 1 << width) - 1;
- else
- mask = ~0;
- max_chars = HOST_BITS_PER_WIDE_INT / width;
-
- while (str < limit)
- {
-#ifdef MULTIBYTE_CHARS
- wchar_t wc;
- int char_len;
-
- char_len = local_mbtowc (&wc, str, limit - str);
- if (char_len == -1)
- {
- cpp_warning (pfile, "ignoring invalid multibyte character");
- c = *str++;
- }
- else
- {
- str += char_len;
- c = wc;
- }
-#else
- c = *str++;
-#endif
-
- if (c == '\\')
- c = cpp_parse_escape (pfile, &str, limit, mask, traditional);
-
-#ifdef MAP_CHARACTER
- if (ISPRINT (c))
- c = MAP_CHARACTER (c);
-#endif
-
- /* Merge character into result; ignore excess chars. */
- if (++chars_seen <= max_chars)
- {
- if (width < HOST_BITS_PER_WIDE_INT)
- result = (result << width) | (c & mask);
- else
- result = c;
- }
- }
-
- if (chars_seen == 0)
- cpp_error (pfile, "empty character constant");
- else if (chars_seen > max_chars)
- {
- chars_seen = max_chars;
- cpp_warning (pfile, "character constant too long");
- }
- else if (chars_seen > 1 && !traditional && warn_multi)
- cpp_warning (pfile, "multi-character character constant");
-
- /* If relevant type is signed, sign-extend the constant. */
- if (chars_seen)
- {
- unsigned int nbits = chars_seen * width;
-
- mask = (unsigned HOST_WIDE_INT) ~0 >> (HOST_BITS_PER_WIDE_INT - nbits);
- if (unsigned_p || ((result >> (nbits - 1)) & 1) == 0)
- result &= mask;
- else
- result |= ~mask;
- }
-
- *pchars_seen = chars_seen;
- return result;
-}
-
-/* Memory buffers. Changing these three constants can have a dramatic
- effect on performance. The values here are reasonable defaults,
- but might be tuned. If you adjust them, be sure to test across a
- range of uses of cpplib, including heavy nested function-like macro
- expansion. Also check the change in peak memory usage (NJAMD is a
- good tool for this). */
-#define MIN_BUFF_SIZE 8000
-#define BUFF_SIZE_UPPER_BOUND(MIN_SIZE) (MIN_BUFF_SIZE + (MIN_SIZE) * 3 / 2)
-#define EXTENDED_BUFF_SIZE(BUFF, MIN_EXTRA) \
- (MIN_EXTRA + ((BUFF)->limit - (BUFF)->cur) * 2)
-
-#if MIN_BUFF_SIZE > BUFF_SIZE_UPPER_BOUND (0)
- #error BUFF_SIZE_UPPER_BOUND must be at least as large as MIN_BUFF_SIZE!
-#endif
-
-struct dummy
-{
- char c;
- union
- {
- double d;
- int *p;
- } u;
-};
-
-#define DEFAULT_ALIGNMENT (offsetof (struct dummy, u))
-#define CPP_ALIGN(size, align) (((size) + ((align) - 1)) & ~((align) - 1))
-
-/* Create a new allocation buffer. Place the control block at the end
- of the buffer, so that buffer overflows will cause immediate chaos. */
-static _cpp_buff *
-new_buff (len)
- size_t len;
-{
- _cpp_buff *result;
- unsigned char *base;
-
- if (len < MIN_BUFF_SIZE)
- len = MIN_BUFF_SIZE;
- len = CPP_ALIGN (len, DEFAULT_ALIGNMENT);
-
- base = xmalloc (len + sizeof (_cpp_buff));
- result = (_cpp_buff *) (base + len);
- result->base = base;
- result->cur = base;
- result->limit = base + len;
- result->next = NULL;
- return result;
-}
-
-/* Place a chain of unwanted allocation buffers on the free list. */
-void
-_cpp_release_buff (pfile, buff)
- cpp_reader *pfile;
- _cpp_buff *buff;
-{
- _cpp_buff *end = buff;
-
- while (end->next)
- end = end->next;
- end->next = pfile->free_buffs;
- pfile->free_buffs = buff;
-}
-
-/* Return a free buffer of size at least MIN_SIZE. */
-_cpp_buff *
-_cpp_get_buff (pfile, min_size)
- cpp_reader *pfile;
- size_t min_size;
-{
- _cpp_buff *result, **p;
-
- for (p = &pfile->free_buffs;; p = &(*p)->next)
- {
- size_t size;
-
- if (*p == NULL)
- return new_buff (min_size);
- result = *p;
- size = result->limit - result->base;
- /* Return a buffer that's big enough, but don't waste one that's
- way too big. */
- if (size >= min_size && size <= BUFF_SIZE_UPPER_BOUND (min_size))
- break;
- }
-
- *p = result->next;
- result->next = NULL;
- result->cur = result->base;
- return result;
-}
-
-/* Creates a new buffer with enough space to hold the uncommitted
- remaining bytes of BUFF, and at least MIN_EXTRA more bytes. Copies
- the excess bytes to the new buffer. Chains the new buffer after
- BUFF, and returns the new buffer. */
-_cpp_buff *
-_cpp_append_extend_buff (pfile, buff, min_extra)
- cpp_reader *pfile;
- _cpp_buff *buff;
- size_t min_extra;
-{
- size_t size = EXTENDED_BUFF_SIZE (buff, min_extra);
- _cpp_buff *new_buff = _cpp_get_buff (pfile, size);
-
- buff->next = new_buff;
- memcpy (new_buff->base, buff->cur, BUFF_ROOM (buff));
- return new_buff;
-}
-
-/* Creates a new buffer with enough space to hold the uncommitted
- remaining bytes of the buffer pointed to by BUFF, and at least
- MIN_EXTRA more bytes. Copies the excess bytes to the new buffer.
- Chains the new buffer before the buffer pointed to by BUFF, and
- updates the pointer to point to the new buffer. */
-void
-_cpp_extend_buff (pfile, pbuff, min_extra)
- cpp_reader *pfile;
- _cpp_buff **pbuff;
- size_t min_extra;
-{
- _cpp_buff *new_buff, *old_buff = *pbuff;
- size_t size = EXTENDED_BUFF_SIZE (old_buff, min_extra);
-
- new_buff = _cpp_get_buff (pfile, size);
- memcpy (new_buff->base, old_buff->cur, BUFF_ROOM (old_buff));
- new_buff->next = old_buff;
- *pbuff = new_buff;
-}
-
-/* Free a chain of buffers starting at BUFF. */
-void
-_cpp_free_buff (buff)
- _cpp_buff *buff;
-{
- _cpp_buff *next;
-
- for (; buff; buff = next)
- {
- next = buff->next;
- free (buff->base);
- }
-}
-
-/* Allocate permanent, unaligned storage of length LEN. */
-unsigned char *
-_cpp_unaligned_alloc (pfile, len)
- cpp_reader *pfile;
- size_t len;
-{
- _cpp_buff *buff = pfile->u_buff;
- unsigned char *result = buff->cur;
-
- if (len > (size_t) (buff->limit - result))
- {
- buff = _cpp_get_buff (pfile, len);
- buff->next = pfile->u_buff;
- pfile->u_buff = buff;
- result = buff->cur;
- }
-
- buff->cur = result + len;
- return result;
-}
-
-/* Allocate permanent, unaligned storage of length LEN from a_buff.
- That buffer is used for growing allocations when saving macro
- replacement lists in a #define, and when parsing an answer to an
- assertion in #assert, #unassert or #if (and therefore possibly
- whilst expanding macros). It therefore must not be used by any
- code that they might call: specifically the lexer and the guts of
- the macro expander.
-
- All existing other uses clearly fit this restriction: storing
- registered pragmas during initialization. */
-unsigned char *
-_cpp_aligned_alloc (pfile, len)
- cpp_reader *pfile;
- size_t len;
-{
- _cpp_buff *buff = pfile->a_buff;
- unsigned char *result = buff->cur;
-
- if (len > (size_t) (buff->limit - result))
- {
- buff = _cpp_get_buff (pfile, len);
- buff->next = pfile->a_buff;
- pfile->a_buff = buff;
- result = buff->cur;
- }
-
- buff->cur = result + len;
- return result;
-}
projects / msp430-gcc.git / blobdiff