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 Distinguish integers, floats, and 'other' pp-numbers.
-o Store ints and char constants as binary values.
-o New command-line assertion syntax.
-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.
-
-*/
+/* This lexer works with a single pass of the file. Recently I
+ re-wrote it to minimize the places where we step backwards in the
+ input stream, to make future changes to support multi-byte
+ character sets fairly straight-forward.
+
+ There is now only one routine where we do step backwards:
+ skip_escaped_newlines. This routine could probably also be changed
+ so that it doesn't need to step back. One possibility is to use a
+ trick similar to that used in lex_period and lex_percent. Two
+ extra characters might be needed, but skip_escaped_newlines itself
+ would probably be the only place that needs to be aware of that,
+ and changes to the remaining routines would probably only be needed
+ if they process a backslash. */
#include "config.h"
#include "system.h"
-#include "intl.h"
#include "cpplib.h"
#include "cpphash.h"
-#include "symcat.h"
-
-const unsigned char *_cpp_digraph_spellings [] = {U"%:", U"%:%:", U"<:",
- U":>", U"<%", U"%>"};
-static const cpp_token placemarker_token = {0, 0, CPP_PLACEMARKER,
- 0 UNION_INIT_ZERO};
-static const cpp_token eof_token = {0, 0, CPP_EOF, 0 UNION_INIT_ZERO};
-
-/* Flags for cpp_context. */
-#define CONTEXT_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. */
-#define CONTEXT_VARARGS (1 << 4) /* If a varargs 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;
+/* 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
- 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;
+/* Tokens with SPELL_STRING store their spelling in the token list,
+ and it's length in the token->val.name.len. */
+enum spell_type
+{
+ SPELL_OPERATOR = 0,
+ SPELL_CHAR,
+ SPELL_IDENT,
+ SPELL_STRING,
+ SPELL_NONE
};
-typedef struct macro_args macro_args;
-struct macro_args
+struct token_spelling
{
- unsigned int *ends;
- const cpp_token **tokens;
- unsigned int capacity;
- unsigned int used;
- unsigned short level;
+ enum spell_type category;
+ const unsigned char *name;
};
-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 *));
+const unsigned char *digraph_spellings [] = {U"%:", U"%:%:", U"<:",
+ U":>", U"<%", U"%>"};
+
+#define OP(e, s) { SPELL_OPERATOR, U s },
+#define TK(e, s) { s, U STRINGX (e) },
+const struct token_spelling token_spellings [N_TTYPES] = {TTYPE_TABLE };
+#undef OP
+#undef TK
+
+#define TOKEN_SPELL(token) (token_spellings[(token)->type].category)
+#define TOKEN_NAME(token) (token_spellings[(token)->type].name)
static cppchar_t handle_newline PARAMS ((cpp_buffer *, cppchar_t));
static cppchar_t skip_escaped_newlines PARAMS ((cpp_buffer *, cppchar_t));
static void adjust_column PARAMS ((cpp_reader *));
static void skip_whitespace PARAMS ((cpp_reader *, cppchar_t));
static cpp_hashnode *parse_identifier PARAMS ((cpp_reader *, cppchar_t));
-static void parse_number PARAMS ((cpp_reader *, cpp_string *, cppchar_t));
+static void parse_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 *, unsigned int, int));
+static void unterminated PARAMS ((cpp_reader *, int));
static int trigraph_ok PARAMS ((cpp_reader *, cppchar_t));
static void save_comment PARAMS ((cpp_reader *, cpp_token *, const U_CHAR *));
static void lex_percent PARAMS ((cpp_buffer *, cpp_token *));
static void lex_dot PARAMS ((cpp_reader *, cpp_token *));
-static void lex_line PARAMS ((cpp_reader *, cpp_toklist *));
-static void lex_token PARAMS ((cpp_reader *, cpp_token *));
-static int lex_next PARAMS ((cpp_reader *, int));
-
-static int is_macro_disabled PARAMS ((cpp_reader *, const cpp_toklist *,
- const cpp_token *));
-
-static 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 *));
-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 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));
-
-#define VALID_SIGN(c, prevc) \
- (((c) == '+' || (c) == '-') && \
- ((prevc) == 'e' || (prevc) == 'E' \
- || (((prevc) == 'p' || (prevc) == 'P') && !CPP_OPTION (pfile, c89))))
-
-/* An upper bound on the number of bytes needed to spell a token,
- including preceding whitespace. */
-static inline size_t TOKEN_LEN PARAMS ((const cpp_token *));
-static inline size_t
-TOKEN_LEN (token)
- const cpp_token *token;
-{
- size_t len;
-
- switch (TOKEN_SPELL (token))
- {
- default: len = 0; break;
- case SPELL_STRING: len = token->val.str.len; break;
- case SPELL_IDENT: len = token->val.node->length; break;
- }
- return len + 5;
-}
-
-#define IS_ARG_CONTEXT(c) ((c)->flags & CONTEXT_ARG)
-#define CURRENT_CONTEXT(pfile) ((pfile)->contexts + (pfile)->cur_context)
-#define ON_REST_ARG(c) \
- (((c)->u.list->flags & VAR_ARGS) \
- && (c)->u.list->tokens[(c)->posn - 1].val.aux \
- == (unsigned int) ((c)->u.list->paramc - 1))
-
-#define ASSIGN_FLAGS_AND_POS(d, s) \
- do {(d)->flags = (s)->flags & (PREV_WHITE | BOL | PASTE_LEFT); \
- 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
-
-/* 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 cpp_token *t;
- cpp_token *hdr;
- U_CHAR *buf, *p;
- size_t len, avail;
-
- avail = 40;
- len = 0;
- buf = xmalloc (avail);
-
- for (;;)
- {
- t = _cpp_get_token (pfile);
- if (t->type == CPP_GREATER || t->type == CPP_EOF)
- break;
-
- if (len + TOKEN_LEN (t) > avail)
- {
- avail = len + TOKEN_LEN (t) + 40;
- buf = xrealloc (buf, avail);
- }
-
- if (t->flags & PREV_WHITE)
- buf[len++] = ' ';
-
- p = spell_token (pfile, t, buf + len);
- len = (size_t) (p - buf); /* p known >= buf */
- }
-
- if (t->type == CPP_EOF)
- cpp_error (pfile, "missing terminating > character");
-
- buf = xrealloc (buf, len);
-
- 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;
-}
-
-/* Token-buffer helper functions. */
-
-/* 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;
+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 *));
- 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);
- }
-}
-
-/* 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);
-}
-
-/* Expand the number of tokens in a list. */
-void
-_cpp_expand_token_space (list, count)
- cpp_toklist *list;
- unsigned int count;
-{
- list->tokens_cap += count;
- list->tokens = (cpp_token *)
- xrealloc (list->tokens, list->tokens_cap * sizeof (cpp_token));
-}
-
-/* Initialize a token list. If EMPTY is false, some token and name
- space is provided. */
-void
-_cpp_init_toklist (list, empty)
- cpp_toklist *list;
- int empty;
-{
- if (empty)
- {
- list->tokens_cap = 0;
- list->tokens = 0;
- list->name_cap = 0;
- list->namebuf = 0;
- }
- else
- {
- /* Initialize token space. */
- list->tokens_cap = 256; /* 4K's worth. */
- list->tokens = (cpp_token *)
- xmalloc ((list->tokens_cap + 1) * sizeof (cpp_token));
-
- /* Initialize name space. */
- list->name_cap = 1024;
- list->namebuf = (unsigned char *) xmalloc (list->name_cap);
- }
-
- _cpp_clear_toklist (list);
-}
-
-/* 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 = 0;
-}
-
-/* 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;
-{
- 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));
- }
-
- return 0;
-}
-
-/* Compare two token lists. */
-int
-_cpp_equiv_toklists (a, b)
- const cpp_toklist *a, *b;
-{
- unsigned int i;
-
- 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;
-}
+static cpp_chunk *new_chunk PARAMS ((unsigned int));
+static int chunk_suitable PARAMS ((cpp_pool *, cpp_chunk *, unsigned int));
+static unsigned int hex_digit_value PARAMS ((unsigned int));
/* Utility routine:
if (token->type != CPP_NAME)
return 0;
- return !ustrcmp (token->val.node->name, (const U_CHAR *)string);
+ return !ustrcmp (NODE_NAME (token->val.node), (const U_CHAR *) string);
}
/* Call when meeting a newline. Returns the character after the newline
"trigraph ??%c converted to %c",
(int) from_char,
(int) _cpp_trigraph_map[from_char]);
- else
- cpp_warning_with_line (pfile, buffer->lineno, CPP_BUF_COL (buffer) - 2,
- "trigraph ??%c ignored", (int) from_char);
+ else if (buffer->cur != buffer->last_Wtrigraphs)
+ {
+ buffer->last_Wtrigraphs = buffer->cur;
+ cpp_warning_with_line (pfile, buffer->lineno,
+ CPP_BUF_COL (buffer) - 2,
+ "trigraph ??%c ignored", (int) from_char);
+ }
}
return accept;
/* Skips any escaped newlines introduced by NEXT, which is either a
'?' or a '\\'. Returns the next character, which will also have
- been placed in buffer->read_ahead. */
+ been placed in buffer->read_ahead. This routine performs
+ preprocessing stages 1 and 2 of the ISO C standard. */
static cppchar_t
skip_escaped_newlines (buffer, next)
cpp_buffer *buffer;
cppchar_t next;
{
- cppchar_t next1;
- const unsigned char *saved_cur;
- int space;
-
- do
+ /* Only do this if we apply stages 1 and 2. */
+ if (!buffer->from_stage3)
{
- if (buffer->cur == buffer->rlimit)
- break;
-
- SAVE_STATE ();
- if (next == '?')
+ cppchar_t next1;
+ const unsigned char *saved_cur;
+ int space;
+
+ do
{
- next1 = *buffer->cur++;
- if (next1 != '?' || buffer->cur == buffer->rlimit)
+ if (buffer->cur == buffer->rlimit)
+ break;
+
+ SAVE_STATE ();
+ if (next == '?')
{
- RESTORE_STATE ();
- break;
+ next1 = *buffer->cur++;
+ if (next1 != '?' || buffer->cur == buffer->rlimit)
+ {
+ RESTORE_STATE ();
+ break;
+ }
+
+ next1 = *buffer->cur++;
+ if (!_cpp_trigraph_map[next1]
+ || !trigraph_ok (buffer->pfile, next1))
+ {
+ RESTORE_STATE ();
+ break;
+ }
+
+ /* We have a full trigraph here. */
+ next = _cpp_trigraph_map[next1];
+ if (next != '\\' || buffer->cur == buffer->rlimit)
+ break;
+ SAVE_STATE ();
+ }
+
+ /* We have a backslash, and room for at least one more character. */
+ space = 0;
+ do
+ {
+ next1 = *buffer->cur++;
+ if (!is_nvspace (next1))
+ break;
+ space = 1;
}
+ while (buffer->cur < buffer->rlimit);
- next1 = *buffer->cur++;
- if (!_cpp_trigraph_map[next1] || !trigraph_ok (buffer->pfile, next1))
+ if (!is_vspace (next1))
{
RESTORE_STATE ();
break;
}
- /* We have a full trigraph here. */
- next = _cpp_trigraph_map[next1];
- if (next != '\\' || buffer->cur == buffer->rlimit)
- break;
- SAVE_STATE ();
- }
-
- /* We have a backslash, and room for at least one more character. */
- space = 0;
- do
- {
- next1 = *buffer->cur++;
- if (!is_nvspace (next1))
- break;
- space = 1;
- }
- while (buffer->cur < buffer->rlimit);
+ if (space && !buffer->pfile->state.lexing_comment)
+ cpp_warning (buffer->pfile,
+ "backslash and newline separated by space");
- if (!is_vspace (next1))
- {
- RESTORE_STATE ();
- break;
+ next = handle_newline (buffer, next1);
+ if (next == EOF)
+ cpp_pedwarn (buffer->pfile, "backslash-newline at end of file");
}
-
- if (space)
- cpp_warning (buffer->pfile,
- "backslash and newline separated by space");
-
- next = handle_newline (buffer, next1);
- if (next == EOF)
- cpp_pedwarn (buffer->pfile, "backslash-newline at end of file");
+ while (next == '\\' || next == '?');
}
- while (next == '\\' || next == '?');
buffer->read_ahead = next;
return next;
cpp_reader *pfile;
{
cpp_buffer *buffer = pfile->buffer;
- cppchar_t c = EOF, prevc;
+ cppchar_t c = EOF, prevc = EOF;
pfile->state.lexing_comment = 1;
while (buffer->cur != buffer->rlimit)
next_char:
/* FIXME: For speed, create a new character class of characters
- of no interest inside block comments. */
+ of interest inside block comments. */
if (c == '?' || c == '\\')
c = skip_escaped_newlines (buffer, c);
warned = 1;
}
}
- else if (IN_DIRECTIVE (pfile) && CPP_PEDANTIC (pfile))
+ else if (pfile->state.in_directive && CPP_PEDANTIC (pfile))
cpp_pedwarn_with_line (pfile, CPP_BUF_LINE (buffer),
CPP_BUF_COL (buffer),
"%s in preprocessing directive",
buffer->read_ahead = c;
}
+/* 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.
Calculate the hash value of the token while parsing, for improved
performance. The hashing algorithm *must* match cpp_lookup(). */
cpp_reader *pfile;
cppchar_t c;
{
+ cpp_hashnode *result;
cpp_buffer *buffer = pfile->buffer;
- unsigned int r = 0, saw_dollar = 0;
- unsigned int orig_used = pfile->token_list.name_used;
+ unsigned int saw_dollar = 0, len;
+ struct obstack *stack = &pfile->hash_table->stack;
do
{
do
{
- if (pfile->token_list.name_used == pfile->token_list.name_cap)
- _cpp_expand_name_space (&pfile->token_list,
- pfile->token_list.name_used + 256);
- pfile->token_list.namebuf[pfile->token_list.name_used++] = c;
- r = HASHSTEP (r, c);
+ obstack_1grow (stack, c);
if (c == '$')
saw_dollar++;
}
while (is_idchar (c));
+ /* Remember the next character. */
+ buffer->read_ahead = c;
+
/* $ is not a identifier character in the standard, but is commonly
accepted as an extension. Don't warn about it in skipped
conditional blocks. */
- if (saw_dollar && CPP_PEDANTIC (pfile) && ! pfile->skipping)
+ if (saw_dollar && CPP_PEDANTIC (pfile) && ! pfile->state.skipping)
cpp_pedwarn (pfile, "'$' character(s) in identifier");
- /* Remember the next character. */
- buffer->read_ahead = c;
- return _cpp_lookup_with_hash (pfile, &pfile->token_list.namebuf[orig_used],
- pfile->token_list.name_used - orig_used, r);
+ /* Identifiers are null-terminated. */
+ len = obstack_object_size (stack);
+ obstack_1grow (stack, '\0');
+
+ /* This routine commits the memory if necessary. */
+ result = (cpp_hashnode *)
+ ht_lookup (pfile->hash_table, obstack_finish (stack), len, HT_ALLOCED);
+
+ /* Some identifiers require diagnostics when lexed. */
+ if (result->flags & NODE_DIAGNOSTIC && !pfile->state.skipping)
+ {
+ /* 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;
}
/* Parse a number, skipping embedded backslash-newlines. */
static void
-parse_number (pfile, number, c)
+parse_number (pfile, number, c, leading_period)
cpp_reader *pfile;
cpp_string *number;
cppchar_t c;
+ int leading_period;
{
- cppchar_t prevc;
cpp_buffer *buffer = pfile->buffer;
- unsigned int orig_used = pfile->token_list.name_used;
+ cpp_pool *pool = &pfile->ident_pool;
+ unsigned char *dest, *limit;
- /* Reserve space for a leading period. */
- if (pfile->state.seen_dot)
- pfile->token_list.name_used++;
+ dest = POOL_FRONT (pool);
+ limit = POOL_LIMIT (pool);
+ /* Place a leading period. */
+ if (leading_period)
+ {
+ if (dest >= limit)
+ limit = _cpp_next_chunk (pool, 0, &dest);
+ *dest++ = '.';
+ }
+
do
{
do
{
- if (pfile->token_list.name_used >= pfile->token_list.name_cap)
- _cpp_expand_name_space (&pfile->token_list,
- pfile->token_list.name_used + 256);
- pfile->token_list.namebuf[pfile->token_list.name_used++] = c;
+ /* Need room for terminating null. */
+ if (dest + 1 >= limit)
+ limit = _cpp_next_chunk (pool, 0, &dest);
+ *dest++ = c;
- prevc = c;
c = EOF;
if (buffer->cur == buffer->rlimit)
break;
c = *buffer->cur++;
}
- while (is_numchar (c) || c == '.' || VALID_SIGN (c, prevc));
+ while (is_numchar (c) || c == '.' || VALID_SIGN (c, dest[-1]));
/* Potential escaped newline? */
if (c != '?' && c != '\\')
break;
c = skip_escaped_newlines (buffer, c);
}
- while (is_numchar (c) || c == '.' || VALID_SIGN (c, prevc));
-
- /* Put any leading period in place, now we have the room. */
- if (pfile->state.seen_dot)
- pfile->token_list.namebuf[orig_used] = '.';
+ while (is_numchar (c) || c == '.' || VALID_SIGN (c, dest[-1]));
/* Remember the next character. */
buffer->read_ahead = c;
- number->text = &pfile->token_list.namebuf[orig_used];
- number->len = pfile->token_list.name_used - orig_used;
+ /* Null-terminate the number. */
+ *dest = '\0';
+
+ number->text = POOL_FRONT (pool);
+ number->len = dest - number->text;
+ POOL_COMMIT (pool, number->len + 1);
}
/* Subroutine of parse_string. Emits error for unterminated strings. */
static void
-unterminated (pfile, line, term)
+unterminated (pfile, term)
cpp_reader *pfile;
- unsigned int line;
int term;
{
cpp_error (pfile, "missing terminating %c character", term);
- if (term == '\"' && pfile->mls_line && pfile->mls_line != line)
+ if (term == '\"' && pfile->mlstring_pos.line
+ && pfile->mlstring_pos.line != pfile->lexer_pos.line)
{
- cpp_error_with_line (pfile, pfile->mls_line, pfile->mls_column,
+ cpp_error_with_line (pfile, pfile->mlstring_pos.line,
+ pfile->mlstring_pos.col,
"possible start of unterminated string literal");
- pfile->mls_line = 0;
+ pfile->mlstring_pos.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 = POOL_FRONT (&pfile->ident_pool);
+
+ /* 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.
+ 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 within
- directives. */
+ Multi-line strings are allowed, but they are deprecated. */
static void
parse_string (pfile, token, terminator)
cpp_reader *pfile;
cppchar_t terminator;
{
cpp_buffer *buffer = pfile->buffer;
- unsigned int orig_used = pfile->token_list.name_used;
+ cpp_pool *pool = &pfile->ident_pool;
+ unsigned char *dest, *limit;
cppchar_t c;
unsigned int nulls = 0;
+ dest = POOL_FRONT (pool);
+ limit = POOL_LIMIT (pool);
+
for (;;)
{
if (buffer->cur == buffer->rlimit)
+ c = EOF;
+ else
+ c = *buffer->cur++;
+
+ have_char:
+ /* We need space for the terminating NUL. */
+ if (dest >= limit)
+ limit = _cpp_next_chunk (pool, 0, &dest);
+
+ if (c == EOF)
{
- c = EOF;
- unterminated (pfile, token->line, terminator);
+ unterminated (pfile, terminator);
break;
}
- c = *buffer->cur++;
- have_char:
/* Handle trigraphs, escaped newlines etc. */
if (c == '?' || c == '\\')
c = skip_escaped_newlines (buffer, c);
- if (c == terminator)
+ if (c == terminator && unescaped_terminator_p (pfile, dest))
{
- unsigned int u = pfile->token_list.name_used;
-
- /* An odd number of consecutive backslashes represents an
- escaped terminator. */
- while (u > orig_used && pfile->token_list.namebuf[u - 1] == '\\')
- u--;
-
- if ((pfile->token_list.name_used - u) % 2 == 0)
- {
- c = EOF;
- break;
- }
+ c = EOF;
+ break;
}
else if (is_vspace (c))
{
/* In assembly language, silently terminate string and
character literals at end of line. This is a kludge
around not knowing where comments are. */
- if (CPP_OPTION (pfile, lang_asm) && terminator != '>')
+ if (CPP_OPTION (pfile, lang) == CLK_ASM && terminator != '>')
break;
/* Character constants and header names may not extend over
multiple lines. In Standard C, neither may strings.
Unfortunately, we accept multiline strings as an
- extension. (Deprecatedly even in directives - otherwise,
- glibc's longlong.h breaks.) */
- if (terminator != '"')
+ extension, except in #include family directives. */
+ if (terminator != '"' || pfile->state.angled_headers)
{
- unterminated (pfile, token->line, terminator);
+ unterminated (pfile, terminator);
break;
}
- if (pfile->mls_line == 0)
- {
- pfile->mls_line = token->line;
- pfile->mls_column = token->col;
- if (CPP_PEDANTIC (pfile))
- cpp_pedwarn (pfile, "multi-line string constant");
- }
+ cpp_pedwarn (pfile, "multi-line string literals are deprecated");
+ if (pfile->mlstring_pos.line == 0)
+ pfile->mlstring_pos = pfile->lexer_pos;
- handle_newline (buffer, c); /* Stores to read_ahead. */
- c = '\n';
+ c = handle_newline (buffer, c);
+ *dest++ = '\n';
+ goto have_char;
}
else if (c == '\0')
{
cpp_warning (pfile, "null character(s) preserved in literal");
}
- if (pfile->token_list.name_used == pfile->token_list.name_cap)
- _cpp_expand_name_space (&pfile->token_list,
- pfile->token_list.name_used + 256);
-
- pfile->token_list.namebuf[pfile->token_list.name_used++] = c;
- /* If we had a new line, the next character is in read_ahead. */
- if (c != '\n')
- continue;
- c = buffer->read_ahead;
- if (c != EOF)
- goto have_char;
+ *dest++ = c;
}
+ /* Remember the next character. */
buffer->read_ahead = c;
+ *dest = '\0';
- token->val.str.text = &pfile->token_list.namebuf[orig_used];
- token->val.str.len = pfile->token_list.name_used - orig_used;
+ token->val.str.text = POOL_FRONT (pool);
+ token->val.str.len = dest - token->val.str.text;
+ POOL_COMMIT (pool, token->val.str.len + 1);
}
-/* For output routine simplicity, the stored comment includes the
- comment start and any terminator. */
+/* The stored comment includes the comment start and any terminator. */
static void
save_comment (pfile, token, from)
cpp_reader *pfile;
{
unsigned char *buffer;
unsigned int len;
- cpp_toklist *list = &pfile->token_list;
len = pfile->buffer->cur - from + 1; /* + 1 for the initial '/'. */
- _cpp_reserve_name_space (list, len);
- buffer = list->namebuf + list->name_used;
- list->name_used += len;
+ /* C++ comments probably (not definitely) have moved past a new
+ line, which we don't want to save in the comment. */
+ if (pfile->buffer->read_ahead != EOF)
+ len--;
+ buffer = _cpp_pool_alloc (&pfile->ident_pool, len);
token->type = CPP_COMMENT;
token->val.str.len = len;
if (c >= '0' && c <= '9')
{
result->type = CPP_NUMBER;
- buffer->pfile->state.seen_dot = 1;
- parse_number (pfile, &result->val.str, c);
- buffer->pfile->state.seen_dot = 0;
+ parse_number (pfile, &result->val.str, c, 1);
}
else
{
}
}
-static void
-lex_token (pfile, result)
+void
+_cpp_lex_token (pfile, result)
cpp_reader *pfile;
cpp_token *result;
{
cppchar_t c;
- cpp_buffer *buffer = pfile->buffer;
+ cpp_buffer *buffer;
const unsigned char *comment_start;
-
- result->flags = 0;
+ unsigned char bol;
+
+ skip:
+ bol = pfile->state.next_bol;
+ done_directive:
+ buffer = pfile->buffer;
+ pfile->state.next_bol = 0;
+ result->flags = buffer->saved_flags;
+ buffer->saved_flags = 0;
next_char:
- result->line = CPP_BUF_LINE (buffer);
+ pfile->lexer_pos.line = buffer->lineno;
next_char2:
- result->col = CPP_BUF_COLUMN (buffer, buffer->cur);
+ pfile->lexer_pos.col = CPP_BUF_COLUMN (buffer, buffer->cur);
c = buffer->read_ahead;
if (c == EOF && buffer->cur < buffer->rlimit)
{
c = *buffer->cur++;
- result->col++;
+ pfile->lexer_pos.col++;
}
do_switch:
switch (c)
{
case EOF:
- /* Non-empty files should end in a newline. Testing
- skip_newlines ensures we only emit the warning once. */
- if (buffer->cur != buffer->line_base && buffer->cur != buffer->buf
- && pfile->state.skip_newlines)
- cpp_pedwarn_with_line (pfile, buffer->lineno, CPP_BUF_COL (buffer),
- "no newline at end of file");
+ /* Non-empty files should end in a newline. Checking "bol" too
+ prevents multiple warnings when hitting the EOF more than
+ once, like in a directive. Don't warn for command line and
+ _Pragma buffers. */
+ if (pfile->lexer_pos.col != 0 && !bol && !buffer->from_stage3)
+ cpp_pedwarn (pfile, "no newline at end of file");
+ pfile->state.next_bol = 1;
+ pfile->state.skipping = 0; /* In case missing #endif. */
result->type = CPP_EOF;
- break;
+ /* Don't do MI optimisation. */
+ return;
case ' ': case '\t': case '\f': case '\v': case '\0':
skip_whitespace (pfile, c);
goto next_char2;
case '\n': case '\r':
- result->type = CPP_EOF;
- handle_newline (buffer, c);
- /* Handling here will change significantly when moving to
- token-at-a-time. */
- if (pfile->state.skip_newlines)
- {
- result->flags &= ~PREV_WHITE; /* Clear any whitespace flag. */
+ if (!pfile->state.in_directive)
+ {
+ handle_newline (buffer, c);
+ bol = 1;
+ pfile->lexer_pos.output_line = buffer->lineno;
+ /* This is a new line, so clear any white space flag.
+ Newlines in arguments are white space (6.10.3.10);
+ parse_arg takes care of that. */
+ result->flags &= ~(PREV_WHITE | AVOID_LPASTE);
goto next_char;
}
- break;
+
+ /* Don't let directives spill over to the next line. */
+ buffer->read_ahead = c;
+ pfile->state.next_bol = 1;
+ result->type = CPP_EOF;
+ /* Don't break; pfile->state.skipping might be true. */
+ return;
case '?':
case '\\':
result->type = CPP_QUERY;
buffer->read_ahead = EOF;
if (c == '\\')
- result->type = CPP_BACKSLASH;
+ goto random_char;
else if (c != '?')
goto do_switch;
}
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);
+ parse_number (pfile, &result->val.str, c, 0);
break;
case '$':
result->val.node = parse_identifier (pfile, c);
/* 'L' may introduce wide characters or strings. */
- if (result->val.node == pfile->spec_nodes->n_L)
+ if (result->val.node == pfile->spec_nodes.n_L)
{
c = buffer->read_ahead; /* For make_string. */
if (c == '\'' || c == '"')
}
}
/* Convert named operators to their proper types. */
- else if (result->val.node->type == T_OPERATOR)
+ else if (result->val.node->flags & NODE_OPERATOR)
{
result->flags |= NAMED_OP;
- result->type = result->val.node->value.code;
+ result->type = result->val.node->value.operator;
}
break;
ACCEPT_CHAR (CPP_DIV_EQ);
if (c != '/' && c != '*')
break;
-
+
if (c == '*')
{
if (skip_block_comment (pfile))
- cpp_error_with_line (pfile, result->line, result->col,
+ cpp_error_with_line (pfile, pfile->lexer_pos.line,
+ pfile->lexer_pos.col,
"unterminated comment");
}
else
&& !CPP_IN_SYSTEM_HEADER (pfile))
break;
- /* We silently allow C++ comments in system headers,
- irrespective of conformance mode, because lots of
- broken systems do that and trying to clean it up in
- fixincludes is a nightmare. */
- if (CPP_OPTION (pfile, c89) && CPP_PEDANTIC (pfile)
+ /* 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,
}
/* Skip_line_comment updates buffer->read_ahead. */
- if (skip_line_comment (pfile))
- cpp_warning_with_line (pfile, result->line, result->col,
+ if (skip_line_comment (pfile) && CPP_OPTION (pfile, warn_comments))
+ cpp_warning_with_line (pfile, pfile->lexer_pos.line,
+ pfile->lexer_pos.col,
"multi-line comment");
}
/* Save the comment as a token in its own right. */
save_comment (pfile, result, comment_start);
- break;
+ /* Don't do MI optimisation. */
+ return;
case '<':
if (pfile->state.angled_headers)
case '%':
lex_percent (buffer, result);
+ if (result->type == CPP_HASH)
+ goto do_hash;
break;
case '.':
break;
case '#':
+ c = buffer->extra_char; /* Can be set by error condition below. */
+ if (c != EOF)
+ {
+ buffer->read_ahead = c;
+ buffer->extra_char = EOF;
+ }
+ else
+ c = get_effective_char (buffer);
+
+ if (c == '#')
+ {
+ ACCEPT_CHAR (CPP_PASTE);
+ break;
+ }
+
result->type = CPP_HASH;
- if (get_effective_char (buffer) == '#')
- ACCEPT_CHAR (CPP_PASTE);
+ do_hash:
+ if (!bol)
+ break;
+ /* 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.
+
+ This implementation will report a hard error, terminate the
+ macro invocation, and proceed to process the directive. */
+ if (pfile->state.parsing_args)
+ {
+ if (pfile->state.parsing_args == 2)
+ cpp_error (pfile,
+ "directives may not be used inside a macro argument");
+
+ /* Put a '#' in lookahead, return CPP_EOF for parse_arg. */
+ buffer->extra_char = buffer->read_ahead;
+ buffer->read_ahead = '#';
+ pfile->state.next_bol = 1;
+ result->type = CPP_EOF;
+
+ /* Get whitespace right - newline_in_args sets it. */
+ if (pfile->lexer_pos.col == 1)
+ result->flags &= ~(PREV_WHITE | AVOID_LPASTE);
+ }
+ else
+ {
+ /* This is the hash introducing a directive. */
+ if (_cpp_handle_directive (pfile, result->flags & PREV_WHITE))
+ goto done_directive; /* bol still 1. */
+ /* This is in fact an assembler #. */
+ }
break;
case '|':
case '}': result->type = CPP_CLOSE_BRACE; break;
case ';': result->type = CPP_SEMICOLON; break;
- case '@':
- if (CPP_OPTION (pfile, objc))
- {
- /* In Objective C, '@' may begin keywords or strings, like
- @keyword or @"string". It would be nice to call
- get_effective_char here and test the result. However, we
- would then need to pass 2 characters to parse_identifier,
- making it ugly and slowing down its main loop. Instead,
- we assume we have an identifier, and recover if not. */
- result->type = CPP_NAME;
- result->val.node = parse_identifier (pfile, c);
- if (result->val.node->length != 1)
- break;
-
- /* OK, so it wasn't an identifier. Maybe a string? */
- if (buffer->read_ahead == '"')
- {
- c = '"';
- ACCEPT_CHAR (CPP_OSTRING);
- goto make_string;
- }
- }
- goto random_char;
+ /* @ is a punctuator in Objective C. */
+ case '@': result->type = CPP_ATSIGN; break;
random_char:
default:
result->type = CPP_OTHER;
- result->val.aux = c;
+ result->val.c = c;
break;
}
-}
-
-/*
- * The tokenizer's main loop. Returns a token list, representing a
- * logical line in the input file. On EOF after some tokens have
- * been processed, we return immediately. Then in next call, or if
- * EOF occurred at the beginning of a logical line, a single CPP_EOF
- * token is placed in the list.
- */
-static void
-lex_line (pfile, list)
- cpp_reader *pfile;
- cpp_toklist *list;
-{
- unsigned int first_token;
- cpp_token *cur_token, *first;
- cpp_buffer *buffer = pfile->buffer;
+ if (!pfile->state.in_directive && pfile->state.skipping)
+ goto skip;
- pfile->state.in_lex_line = 1;
- if (pfile->buffer->cur == pfile->buffer->buf)
- list->flags |= BEG_OF_FILE;
+ /* If not in a directive, this token invalidates controlling macros. */
+ if (!pfile->state.in_directive)
+ pfile->mi_valid = false;
+}
- retry:
- pfile->state.in_directive = 0;
- pfile->state.angled_headers = 0;
- pfile->state.skip_newlines = 1;
- pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments);
- first_token = list->tokens_used;
- list->file = buffer->nominal_fname;
+/* An upper bound on the number of bytes needed to spell a token,
+ including preceding whitespace. */
+unsigned int
+cpp_token_len (token)
+ const cpp_token *token;
+{
+ unsigned int len;
- do
+ switch (TOKEN_SPELL (token))
{
- if (list->tokens_used >= list->tokens_cap)
- _cpp_expand_token_space (list, 256);
-
- cur_token = list->tokens + list->tokens_used;
- lex_token (pfile, cur_token);
-
- if (pfile->state.skip_newlines)
- {
- pfile->state.skip_newlines = 0;
- list->line = buffer->lineno;
- if (cur_token->type == CPP_HASH)
- {
- pfile->state.in_directive = 1;
- pfile->state.save_comments = 0;
- pfile->state.indented = cur_token->flags & PREV_WHITE;
- }
- /* 6.10.3.10: Within the sequence of preprocessing tokens
- making up the invocation of a function-like macro, new
- line is considered a normal white-space character. */
- else if (first_token != 0)
- cur_token->flags |= PREV_WHITE;
- }
- else if (IN_DIRECTIVE (pfile) && list->tokens_used == first_token + 1)
- {
- if (cur_token->type == CPP_NUMBER)
- list->directive = _cpp_check_linemarker (pfile, cur_token);
- else
- list->directive = _cpp_check_directive (pfile, cur_token);
- }
-
- /* _cpp_get_line assumes list->tokens_used refers to the current
- token being lexed. So do this after _cpp_check_directive to
- get the warnings therein correct. */
- list->tokens_used++;
+ default: len = 0; break;
+ case SPELL_STRING: len = token->val.str.len; break;
+ case SPELL_IDENT: len = NODE_LEN (token->val.node); break;
}
- while (cur_token->type != CPP_EOF);
-
- /* All tokens are allocated, so the memory location is fixed. */
- first = &list->tokens[first_token];
- first->flags |= BOL;
- pfile->first_directive_token = first;
-
- /* Don't complain about the null directive, nor directives in
- assembly source: we don't know where the comments are, and # may
- introduce assembler pseudo-ops. Don't complain about invalid
- directives in skipped conditional groups (6.10 p4). */
- if (IN_DIRECTIVE (pfile) && !KNOWN_DIRECTIVE (list) && !pfile->skipping
- && !CPP_OPTION (pfile, lang_asm))
- {
- if (cur_token > first + 1)
- {
- if (first[1].type == CPP_NAME)
- cpp_error_with_line (pfile, first->line, first->col,
- "invalid preprocessing directive #%s",
- first[1].val.node->name);
- else
- cpp_error_with_line (pfile, first->line, first->col,
- "invalid preprocessing directive");
- }
-
- /* Discard this line to prevent further errors from cc1. */
- _cpp_clear_toklist (list);
- goto retry;
- }
-
- /* Drop the EOF unless really at EOF or in a directive. */
- if (cur_token != first && !KNOWN_DIRECTIVE (list)
- && pfile->done_initializing)
- list->tokens_used--;
-
- pfile->state.in_lex_line = 0;
+ /* 1 for whitespace, 4 for comment delimeters. */
+ 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. */
-
-static unsigned char *
-spell_token (pfile, token, buffer)
+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;
unsigned char c;
if (token->flags & DIGRAPH)
- spelling = _cpp_digraph_spellings[token->type - CPP_FIRST_DIGRAPH];
+ spelling
+ = digraph_spellings[(int) token->type - (int) CPP_FIRST_DIGRAPH];
else if (token->flags & NAMED_OP)
goto spell_ident;
else
case SPELL_IDENT:
spell_ident:
- memcpy (buffer, token->val.node->name, token->val.node->length);
- buffer += token->val.node->length;
+ memcpy (buffer, NODE_NAME (token->val.node), NODE_LEN (token->val.node));
+ buffer += NODE_LEN (token->val.node);
break;
case SPELL_STRING:
{
case CPP_STRING: left = '"'; right = '"'; tag = '\0'; break;
case CPP_WSTRING: left = '"'; right = '"'; tag = 'L'; break;
- case CPP_OSTRING: left = '"'; right = '"'; tag = '@'; break;
case CPP_CHAR: left = '\''; right = '\''; tag = '\0'; break;
case CPP_WCHAR: left = '\''; right = '\''; tag = 'L'; break;
case CPP_HEADER_NAME: left = '<'; right = '>'; tag = '\0'; break;
break;
case SPELL_CHAR:
- *buffer++ = token->val.aux;
+ *buffer++ = token->val.c;
break;
case SPELL_NONE:
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)
+/* Returns a token as a null-terminated string. The string is
+ temporary, and automatically freed later. Useful for diagnostics. */
+unsigned char *
+cpp_token_as_text (pfile, token)
cpp_reader *pfile;
- const cpp_toklist *expansion;
const cpp_token *token;
{
- cpp_context *context = CURRENT_CONTEXT (pfile);
-
- /* 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))
- {
- if (token->flags & PASTED)
- context--;
- else if (!(context->flags & CONTEXT_RAW))
- return 1;
- else if (context->flags & (CONTEXT_PASTEL | CONTEXT_PASTER))
- context--;
- }
+ unsigned int len = cpp_token_len (token);
+ unsigned char *start = _cpp_pool_alloc (&pfile->ident_pool, len), *end;
- /* Have we already used this macro? */
- while (context->level > 0)
- {
- 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--;
- }
-
- /* 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)
- {
- 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)
- {
- 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;
- }
+ end = cpp_spell_token (pfile, token, start);
+ end[0] = '\0';
- 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)
- {
- _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;
- }
- }
-
- return 0;
+ return start;
}
-/* 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;
+/* Used by C front ends. Should really move to using cpp_token_as_text. */
+const char *
+cpp_type2name (type)
+ enum cpp_ttype type;
{
- 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;
+ return (const char *) token_spellings[type].name;
}
-/* 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)
- {
- was_raw = raw;
- save_token (args, 0);
- count++;
- }
- save_token (args, token);
- }
-
- out:
- if (count == 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++;
- }
-
- *pcount = count;
- return token;
-}
-
-/* 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. */
-
-#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;
+/* Writes the spelling of token to FP. Separate from cpp_spell_token
+ for efficiency - to avoid double-buffering. Also, outputs a space
+ if PREV_WHITE is flagged. */
+void
+cpp_output_token (token, fp)
+ const cpp_token *token;
+ FILE *fp;
{
- const cpp_token *token;
- const cpp_toklist *macro;
- unsigned int total = 0;
- unsigned int paren_context = pfile->cur_context;
- int argc = 0;
+ if (token->flags & PREV_WHITE)
+ putc (' ', fp);
- macro = hp->value.expansion;
- do
- {
- unsigned int count;
-
- 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);
-
- 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))
- {
- /* 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));
- 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_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;
- }
-
- return 0;
-}
-
-/* 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--)
+ switch (TOKEN_SPELL (token))
{
- U_CHAR c = *src++;
-
- if (c == '\\' || c == '"')
- {
- *dest++ = '\\';
- *dest++ = c;
- }
- else
- {
- if (ISPRINT (c))
- *dest++ = c;
- else
- {
- sprintf ((char *) dest, "\\%03o", c);
- dest += 4;
- }
- }
- }
-
- 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 SPELL_OPERATOR:
+ {
+ const unsigned char *spelling;
-/* 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)
- {
- pfile->temp_cap += pfile->temp_cap + 20;
- pfile->temp_tokens = (cpp_token **) xrealloc
- (pfile->temp_tokens, pfile->temp_cap * sizeof (cpp_token *));
- }
- pfile->temp_tokens[pfile->temp_alloced++] = (cpp_token *) xmalloc
- (sizeof (cpp_token));
- }
+ 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);
- return pfile->temp_tokens[pfile->temp_used++];
-}
+ ufputs (spelling, fp);
+ }
+ break;
-/* 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];
+ spell_ident:
+ case SPELL_IDENT:
+ ufputs (NODE_NAME (token->val.node), fp);
+ break;
- if (TOKEN_SPELL (token) == SPELL_STRING)
- {
- free ((char *) token->val.str.text);
- token->val.str.text = 0;
- }
- }
-}
+ case SPELL_STRING:
+ {
+ int left, right, tag;
+ switch (token->type)
+ {
+ case CPP_STRING: left = '"'; right = '"'; tag = '\0'; break;
+ case CPP_WSTRING: left = '"'; right = '"'; tag = 'L'; break;
+ case CPP_CHAR: left = '\''; right = '\''; tag = '\0'; break;
+ case CPP_WCHAR: left = '\''; right = '\''; tag = 'L'; break;
+ case CPP_HEADER_NAME: left = '<'; right = '>'; tag = '\0'; break;
+ default: left = '\0'; right = '\0'; tag = '\0'; break;
+ }
+ if (tag) putc (tag, fp);
+ if (left) putc (left, fp);
+ fwrite (token->val.str.text, 1, token->val.str.len, fp);
+ if (right) putc (right, fp);
+ }
+ break;
-/* 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);
- }
+ case SPELL_CHAR:
+ putc (token->val.c, fp);
+ break;
- if (pfile->date)
- {
- free ((char *) pfile->date->val.str.text);
- free (pfile->date);
- free ((char *) pfile->time->val.str.text);
- free (pfile->time);
+ case SPELL_NONE:
+ /* An error, most probably. */
+ break;
}
}
-/* Copy TOKEN into a temporary token from PFILE's store. */
-static cpp_token *
-duplicate_token (pfile, token)
- cpp_reader *pfile;
- const cpp_token *token;
+/* Compare two tokens. */
+int
+_cpp_equiv_tokens (a, b)
+ const cpp_token *a, *b;
{
- cpp_token *result = get_temp_token (pfile);
+ if (a->type == b->type && a->flags == b->flags)
+ switch (TOKEN_SPELL (a))
+ {
+ default: /* Keep compiler happy. */
+ case SPELL_OPERATOR:
+ return 1;
+ case SPELL_CHAR:
+ return a->val.c == b->val.c; /* Character. */
+ case SPELL_NONE:
+ return (a->type != CPP_MACRO_ARG || a->val.arg_no == b->val.arg_no);
+ case SPELL_IDENT:
+ return a->val.node == b->val.node;
+ case SPELL_STRING:
+ return (a->val.str.len == b->val.str.len
+ && !memcmp (a->val.str.text, b->val.str.text,
+ a->val.str.len));
+ }
- *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;
+ return 0;
}
/* Determine whether two tokens can be pasted together, and if so,
be pasted, or the appropriate type for the merged token if they
can. */
enum cpp_ttype
-_cpp_can_paste (pfile, token1, token2, digraph)
+cpp_can_paste (pfile, token1, token2, digraph)
cpp_reader * pfile;
const cpp_token *token1, *token2;
int* digraph;
if (token2->flags & NAMED_OP)
b = CPP_NAME;
- if (a <= CPP_LAST_EQ && b == CPP_EQ)
- return a + (CPP_EQ_EQ - CPP_EQ);
+ if ((int) a <= (int) CPP_LAST_EQ && b == CPP_EQ)
+ return (enum cpp_ttype) ((int) a + ((int) CPP_EQ_EQ - (int) CPP_EQ));
switch (a)
{
case CPP_NAME:
if (b == CPP_NAME) return CPP_NAME;
if (b == CPP_NUMBER
- && is_numstart(token2->val.str.text[0])) return CPP_NAME;
+ && name_p (pfile, &token2->val.str)) return CPP_NAME;
if (b == CPP_CHAR
- && token1->val.node == pfile->spec_nodes->n_L) return CPP_WCHAR;
+ && 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;
+ && token1->val.node == pfile->spec_nodes.n_L) return CPP_WSTRING;
break;
case CPP_NUMBER:
return CPP_NUMBER;
break;
- case CPP_OTHER:
- if (CPP_OPTION (pfile, objc) && token1->val.aux == '@')
- {
- if (b == CPP_NAME) return CPP_NAME;
- if (b == CPP_STRING) return CPP_OSTRING;
- }
-
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 ## ? */
+/* 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". */
- 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;
- context = CURRENT_CONTEXT (pfile);
-
- /* 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)
- {
- /* GCC has special extended semantics for , ## b where b is
- a varargs parameter: the comma disappears if b was given
- no actual arguments (not merely if b is an empty
- argument). */
- if (token->type == CPP_COMMA && (context->flags & CONTEXT_VARARGS))
- pasted = duplicate_token (pfile, second);
- else
- pasted = duplicate_token (pfile, token);
- }
- else
- {
- int digraph = 0;
- enum cpp_ttype type = _cpp_can_paste (pfile, token, second, &digraph);
-
- if (type == CPP_EOF)
- {
- if (CPP_OPTION (pfile, warn_paste))
- {
- /* Do not complain about , ## <whatever> if
- <whatever> came from a variable argument, because
- the author probably intended the ## to trigger
- the special extended semantics (see above). */
- if (token->type == CPP_COMMA && IS_ARG_CONTEXT (context)
- && ON_REST_ARG (context - 1))
- /* no warning */;
- else
- cpp_warning (pfile,
- "pasting would not give a valid preprocessing token");
- }
- _cpp_push_token (pfile, second);
- /* A short term hack to safely clear the PASTE_LEFT flag. */
- pasted = duplicate_token (pfile, token);
- pasted->flags &= ~PASTE_LEFT;
- return pasted;
- }
-
- if (type == CPP_NAME || type == CPP_NUMBER)
- {
- /* 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
- || type == CPP_OSTRING)
- pasted = duplicate_token (pfile, second);
- else
- {
- 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;
- /* 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)
+int
+cpp_avoid_paste (pfile, token1, token2)
cpp_reader *pfile;
- const cpp_token *token;
+ const cpp_token *token1, *token2;
{
- 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)
- {
- buf_used = quote_string (&main_buf[buf_used], buf, len) - main_buf;
- free (buf);
- }
- else
- buf_used += len;
-
- whitespace = 1;
- if (token->type == CPP_BACKSLASH)
- backslash_count++;
- else
- backslash_count = 0;
- }
+ enum cpp_ttype a = token1->type, b = token2->type;
+ cppchar_t c;
- /* Ignore the final \ of invalid string literals. */
- if (backslash_count & 1)
- {
- cpp_warning (pfile, "invalid string literal, ignoring final '\\'");
- buf_used--;
- }
+ if (token1->flags & NAMED_OP)
+ a = CPP_NAME;
+ if (token2->flags & NAMED_OP)
+ b = CPP_NAME;
- result->type = CPP_STRING;
- result->val.str.text = main_buf;
- result->val.str.len = buf_used;
- restore_macro_expansion (pfile, prev_value);
- return result;
-}
+ 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];
-/* Allocate more room on the context stack of PFILE. */
-static void
-expand_context_stack (pfile)
- cpp_reader *pfile;
-{
- pfile->context_cap += pfile->context_cap + 20;
- pfile->contexts = (cpp_context *)
- xrealloc (pfile->contexts, pfile->context_cap * sizeof (cpp_context));
-}
+ /* Quickly get everything that can paste with an '='. */
+ if ((int) a <= (int) CPP_LAST_EQ && c == '=')
+ return 1;
-/* 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)
+ switch (a)
{
- 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;
-
- 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)
- {
- free_macro_args (args);
- return 1;
- }
- /* Set the level after the call to parse_args. */
- args->level = pfile->cur_context;
+ 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;
}
- /* Now push its context. */
- pfile->cur_context++;
- if (pfile->cur_context == pfile->context_cap)
- expand_context_stack (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;
-
- /* 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;
- if ((context[-1].u.list->flags & VAR_ARGS)
- && token->val.aux + 1 == (unsigned) context[-1].u.list->paramc)
- context->flags |= CONTEXT_VARARGS;
- context->pushed_token = 0;
-
- /* Set the flags of the first token. There is one. */
- {
- 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. */
+/* Output all the remaining tokens on the current line, and a newline
+ character, to FP. Leading whitespace is removed. */
void
-_cpp_push_token (pfile, token)
+cpp_output_line (pfile, fp)
cpp_reader *pfile;
- const cpp_token *token;
+ FILE *fp;
{
- cpp_context *context = CURRENT_CONTEXT (pfile);
+ cpp_token token;
- if (context->posn > 0)
+ cpp_get_token (pfile, &token);
+ token.flags &= ~PREV_WHITE;
+ while (token.type != CPP_EOF)
{
- 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 (prev == token)
- {
- context->posn--;
- return;
- }
+ cpp_output_token (&token, fp);
+ cpp_get_token (pfile, &token);
}
- 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--;
+ putc ('\n', fp);
}
-/* Handle a preprocessing directive. TOKEN is the CPP_HASH token
- introducing the directive. */
-void
-_cpp_process_directive (pfile, token)
- cpp_reader *pfile;
- const cpp_token *token;
+/* Returns the value of a hexadecimal digit. */
+static unsigned int
+hex_digit_value (c)
+ unsigned int c;
{
- 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));
-
- 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);
+ if (c >= 'a' && c <= 'f')
+ return c - 'a' + 10;
+ if (c >= 'A' && c <= 'F')
+ return c - 'A' + 10;
+ if (c >= '0' && c <= '9')
+ return c - '0';
+ abort ();
}
-/* 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 (;;)
- {
- token = _cpp_get_token (pfile);
+/* 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.
- if (token->type == CPP_PLACEMARKER)
- continue;
+ [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.
- if (token->type == CPP_HASH && token->flags & BOL
- && pfile->token_list.directive)
- {
- _cpp_process_directive (pfile, token);
- continue;
- }
+ We assume that wchar_t is Unicode, so we don't need to do any
+ mapping. Is this ever wrong?
- return token;
- }
-}
+ 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. */
-/* 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)
+static int
+maybe_read_ucs (pfile, pstr, limit, pc)
cpp_reader *pfile;
+ const unsigned char **pstr;
+ const unsigned char *limit;
+ unsigned int *pc;
{
- const cpp_token *token, *old_token;
- cpp_hashnode *node;
+ const unsigned char *p = *pstr;
+ unsigned int code = 0;
+ unsigned int c = *pc, length;
- /* Loop until we hit a non-macro token. */
- for (;;)
- {
- token = get_raw_token (pfile);
-
- /* Short circuit EOF. */
- if (token->type == CPP_EOF)
- return token;
+ /* Only attempt to interpret a UCS for C++ and C99. */
+ if (! (CPP_OPTION (pfile, cplusplus) || CPP_OPTION (pfile, c99)))
+ return 1;
- /* If we are skipping... */
- if (pfile->skipping)
- {
- /* we still have to process directives, */
- if (pfile->token_list.directive)
- return token;
+ if (CPP_WTRADITIONAL (pfile))
+ cpp_warning (pfile, "the meaning of '\\%c' varies with -traditional", c);
- /* but everything else is ignored. */
- _cpp_skip_rest_of_line (pfile);
- continue;
- }
+ length = (c == 'u' ? 4: 8);
- /* 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;
-
- /* If we are rescanning preprocessed input, no macro expansion or
- token pasting may occur. */
- if (CPP_OPTION (pfile, preprocessed))
- return token;
-
- old_token = token;
-
- /* 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, or was this token just pasted?
- (Note we don't check token->flags & PASTED, because that
- counts tokens that were pasted at some point in the past,
- we're only interested in tokens that were pasted by this call
- to maybe_paste_with_next.) */
- if (pfile->no_expand_level == pfile->cur_context
- || pfile->paste_level
- || (token != old_token
- && pfile->no_expand_level + 1 == pfile->cur_context))
- 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 (push_macro_context (pfile, token))
- return token;
- /* else loop */
+ if ((size_t) (limit - p) < length)
+ {
+ cpp_error (pfile, "incomplete universal-character-name");
+ /* Skip to the end to avoid more diagnostics. */
+ p = limit;
}
-}
-
-/* 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;
-{
- const cpp_token *result;
- cpp_context *context;
-
- for (;;)
+ else
{
- 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))
+ for (; length; length--, p++)
{
- result = context->u.arg[context->posn++];
- if (result == 0)
+ c = *p;
+ if (ISXDIGIT (c))
+ code = (code << 4) + hex_digit_value (c);
+ else
{
- context->flags ^= CONTEXT_RAW;
- result = context->u.arg[context->posn++];
+ cpp_error (pfile,
+ "non-hex digit '%c' in universal-character-name", c);
+ /* We shouldn't skip in case there are multibyte chars. */
+ break;
}
- 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);
+#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
- push_arg_context (pfile, result);
- }
+ *pstr = p;
+ *pc = code;
+ return 0;
}
-/* 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;
-}
+/* 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.
-/* 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)
+ Handles all relevant diagnostics. */
+
+unsigned int
+cpp_parse_escape (pfile, pstr, limit, mask, traditional)
cpp_reader *pfile;
- int clear;
+ const unsigned char **pstr;
+ const unsigned char *limit;
+ unsigned HOST_WIDE_INT mask;
+ int traditional;
{
- cpp_toklist *list = &pfile->token_list;
- const cpp_token *old_list = list->tokens;
- unsigned int old_used = list->tokens_used;
+ int unknown = 0;
+ const unsigned char *str = *pstr;
+ unsigned int c = *str++;
- if (clear)
+ switch (c)
{
- /* 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 '\\': 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;
- if (!clear && pfile->args)
- {
- /* Fix up argument token pointers. */
- if (old_list != list->tokens)
+ 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;
+ unsigned int i = 0, overflow = 0;
+ int digits_found = 0;
- for (i = 0; i < pfile->args->used; i++)
+ while (str < limit)
{
- 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));
+ c = *str;
+ if (! ISXDIGIT (c))
+ break;
+ str++;
+ overflow |= i ^ (i << 4 >> 4);
+ i = (i << 4) + hex_digit_value (c);
+ digits_found = 1;
}
- }
-
- /* 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.
- This implementation will report a hard error and treat the
- 'sequence of preprocessing tokens' as part of the macro argument,
- not a directive.
+ if (!digits_found)
+ cpp_error (pfile, "\\x used with no following hex digits");
- Note if pfile->args == 0, we're OK since we're only inside a
- macro argument after a '('. */
- if (list->directive)
- {
- 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;
+ if (overflow | (i != (i & mask)))
+ {
+ cpp_pedwarn (pfile, "hex escape sequence out of range");
+ i &= mask;
+ }
+ c = i;
}
- }
+ break;
- return 0;
-}
+ case '0': case '1': case '2': case '3':
+ case '4': case '5': case '6': case '7':
+ {
+ unsigned int i = c - '0';
+ int count = 0;
-/* 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 we should not "overflow"
- into the rest of the file (e.g. 6.10.3.1.1). */
-static int
-pop_context (pfile)
- cpp_reader *pfile;
-{
- cpp_context *context;
+ while (str < limit && ++count < 3)
+ {
+ c = *str;
+ if (c < '0' || c > '7')
+ break;
+ str++;
+ i = (i << 3) + c - '0';
+ }
- if (pfile->cur_context == 0)
- {
- /* 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;
+ if (i != (i & mask))
+ {
+ cpp_pedwarn (pfile, "octal escape sequence out of range");
+ i &= mask;
+ }
+ c = i;
+ }
+ break;
- return lex_next (pfile, pfile->no_expand_level == UINT_MAX);
+ default:
+ unknown = 1;
+ break;
}
- /* 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 (unknown)
+ {
+ if (ISGRAPH (c))
+ cpp_pedwarn (pfile, "unknown escape sequence '\\%c'", c);
+ else
+ cpp_pedwarn (pfile, "unknown escape sequence: '\\%03o'", c);
+ }
- if (pfile->cur_context == pfile->no_expand_level)
- pfile->no_expand_level--;
- pfile->cur_context--;
+ if (c > mask)
+ cpp_pedwarn (pfile, "escape sequence out of range for character");
- return 0;
+ *pstr = str;
+ return c;
}
-/* Turn off macro expansion at the current context level. */
-static unsigned int
-prevent_macro_expansion (pfile)
- cpp_reader *pfile;
-{
- unsigned int prev_value = pfile->no_expand_level;
- pfile->no_expand_level = pfile->cur_context;
- return prev_value;
-}
+#ifndef MAX_CHAR_TYPE_SIZE
+#define MAX_CHAR_TYPE_SIZE CHAR_TYPE_SIZE
+#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;
-}
+#ifndef MAX_WCHAR_TYPE_SIZE
+#define MAX_WCHAR_TYPE_SIZE WCHAR_TYPE_SIZE
+#endif
-/* Used by cpperror.c to obtain the correct line and column to report
- in a diagnostic. */
-unsigned int
-_cpp_get_line (pfile, pcol)
+/* 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;
- unsigned int *pcol;
-{
- unsigned int index;
- const cpp_token *cur_token;
+ const cpp_token *token;
+ int warn_multi;
+ int traditional;
+ unsigned int *pchars_seen;
+{
+ const unsigned char *str = token->val.str.text;
+ const unsigned char *limit = str + token->val.str.len;
+ unsigned int chars_seen = 0;
+ unsigned int width, max_chars, c;
+ unsigned HOST_WIDE_INT mask;
+ HOST_WIDE_INT result = 0;
+
+#ifdef MULTIBYTE_CHARS
+ (void) local_mbtowc (NULL, NULL, 0);
+#endif
+
+ /* Width in bits. */
+ if (token->type == CPP_CHAR)
+ width = MAX_CHAR_TYPE_SIZE;
+ else
+ width = MAX_WCHAR_TYPE_SIZE;
- if (pfile->state.in_lex_line)
- index = pfile->token_list.tokens_used;
+ 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)
{
- index = pfile->contexts[0].posn;
+#ifdef MULTIBYTE_CHARS
+ wchar_t wc;
+ int char_len;
- if (index == 0)
+ 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 (pcol)
- *pcol = 0;
- return 0;
+ if (width < HOST_BITS_PER_WIDE_INT)
+ result = (result << width) | (c & mask);
+ else
+ result = c;
}
- index--;
}
- cur_token = &pfile->token_list.tokens[index];
- if (pcol)
- *pcol = cur_token->col;
- return cur_token->line;
+ if (chars_seen == 0)
+ cpp_error (pfile, "empty character constant");
+ else if (chars_seen > max_chars)
+ {
+ chars_seen = max_chars;
+ cpp_warning (pfile, "character constant too long");
+ }
+ else if (chars_seen > 1 && !traditional && warn_multi)
+ cpp_warning (pfile, "multi-character character constant");
+
+ /* If char type is signed, sign-extend the constant. The
+ __CHAR_UNSIGNED__ macro is set by the driver if appropriate. */
+ if (token->type == CPP_CHAR && chars_seen)
+ {
+ unsigned int nbits = chars_seen * width;
+ unsigned int mask = (unsigned int) ~0 >> (HOST_BITS_PER_INT - nbits);
+
+ if (pfile->spec_nodes.n__CHAR_UNSIGNED__->type == NT_MACRO
+ || ((result >> (nbits - 1)) & 1) == 0)
+ result &= mask;
+ else
+ result |= ~mask;
+ }
+
+ *pchars_seen = chars_seen;
+ return result;
}
-#define DSC(str) (const U_CHAR *)str, sizeof str - 1
-static const char * const monthnames[] =
+/* Memory pools. */
+
+struct dummy
{
- "Jan", "Feb", "Mar", "Apr", "May", "Jun",
- "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
+ char c;
+ union
+ {
+ double d;
+ int *p;
+ } u;
};
-/* Handle builtin macros like __FILE__. */
-static const cpp_token *
-special_symbol (pfile, node, token)
- cpp_reader *pfile;
- cpp_hashnode *node;
- const cpp_token *token;
-{
- cpp_token *result;
- cpp_buffer *ip;
+#define DEFAULT_ALIGNMENT (offsetof (struct dummy, u))
- switch (node->type)
- {
- case T_FILE:
- case T_BASE_FILE:
- {
- const char *file;
+static int
+chunk_suitable (pool, chunk, size)
+ cpp_pool *pool;
+ cpp_chunk *chunk;
+ unsigned int size;
+{
+ /* Being at least twice SIZE means we can use memcpy in
+ _cpp_next_chunk rather than memmove. Besides, it's a good idea
+ anyway. */
+ return (chunk && pool->locked != chunk
+ && (unsigned int) (chunk->limit - chunk->base) >= size * 2);
+}
- 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);
+/* Returns the end of the new pool. PTR points to a char in the old
+ pool, and is updated to point to the same char in the new pool. */
+unsigned char *
+_cpp_next_chunk (pool, len, ptr)
+ cpp_pool *pool;
+ unsigned int len;
+ unsigned char **ptr;
+{
+ cpp_chunk *chunk = pool->cur->next;
- 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;
+ /* LEN is the minimum size we want in the new pool. */
+ len += POOL_ROOM (pool);
+ if (! chunk_suitable (pool, chunk, len))
+ {
+ chunk = new_chunk (POOL_SIZE (pool) * 2 + len);
- 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;
+ chunk->next = pool->cur->next;
+ pool->cur->next = chunk;
+ }
- case T_STDC:
- {
- int stdc = 1;
+ /* Update the pointer before changing chunk's front. */
+ if (ptr)
+ *ptr += chunk->base - POOL_FRONT (pool);
-#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;
+ memcpy (chunk->base, POOL_FRONT (pool), POOL_ROOM (pool));
+ chunk->front = chunk->base;
- 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;
+ pool->cur = chunk;
+ return POOL_LIMIT (pool);
+}
- case T_POISON:
- cpp_error (pfile, "attempt to use poisoned \"%s\"", node->name);
- return token;
+static cpp_chunk *
+new_chunk (size)
+ unsigned int size;
+{
+ unsigned char *base;
+ cpp_chunk *result;
- default:
- cpp_ice (pfile, "invalid special hash type");
- return token;
- }
+ size = POOL_ALIGN (size, DEFAULT_ALIGNMENT);
+ base = (unsigned char *) xmalloc (size + sizeof (cpp_chunk));
+ /* Put the chunk descriptor at the end. Then chunk overruns will
+ cause obvious chaos. */
+ result = (cpp_chunk *) (base + size);
+ result->base = base;
+ result->front = base;
+ result->limit = base + size;
+ result->next = 0;
- ASSIGN_FLAGS_AND_POS (result, token);
return result;
}
-#undef DSC
-/* Allocate pfile->input_buffer, and initialize _cpp_trigraph_map[]
- if it hasn't happened already. */
+void
+_cpp_init_pool (pool, size, align, temp)
+ cpp_pool *pool;
+ unsigned int size, align, temp;
+{
+ if (align == 0)
+ align = DEFAULT_ALIGNMENT;
+ if (align & (align - 1))
+ abort ();
+ pool->align = align;
+ pool->cur = new_chunk (size);
+ pool->locked = 0;
+ pool->locks = 0;
+ if (temp)
+ pool->cur->next = pool->cur;
+}
void
-_cpp_init_input_buffer (pfile)
- cpp_reader *pfile;
+_cpp_lock_pool (pool)
+ cpp_pool *pool;
{
- cpp_context *base;
-
- _cpp_init_toklist (&pfile->token_list, 0);
- 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;
+ if (pool->locks++ == 0)
+ pool->locked = pool->cur;
}
-/* Moves to the end of the directive line, popping contexts as
- necessary. */
void
-_cpp_skip_rest_of_line (pfile)
- cpp_reader *pfile;
+_cpp_unlock_pool (pool)
+ cpp_pool *pool;
{
- /* 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;
+ if (--pool->locks == 0)
+ pool->locked = 0;
}
-/* Directive handler wrapper used by the command line option
- processor. */
void
-_cpp_run_directive (pfile, dir, buf, count, name)
- cpp_reader *pfile;
- const struct directive *dir;
- const char *buf;
- size_t count;
- const char *name;
+_cpp_free_pool (pool)
+ cpp_pool *pool;
{
- if (cpp_push_buffer (pfile, (const U_CHAR *)buf, count) != NULL)
+ cpp_chunk *chunk = pool->cur, *next;
+
+ do
{
- unsigned int prev_lvl = 0;
+ next = chunk->next;
+ free (chunk->base);
+ chunk = next;
+ }
+ while (chunk && chunk != pool->cur);
+}
- if (name)
- CPP_BUFFER (pfile)->nominal_fname = name;
- else
- CPP_BUFFER (pfile)->nominal_fname = _("<command line>");
- CPP_BUFFER (pfile)->lineno = (unsigned int)-1;
+/* Reserve LEN bytes from a memory pool. */
+unsigned char *
+_cpp_pool_reserve (pool, len)
+ cpp_pool *pool;
+ unsigned int len;
+{
+ len = POOL_ALIGN (len, pool->align);
+ if (len > (unsigned int) POOL_ROOM (pool))
+ _cpp_next_chunk (pool, len, 0);
- /* 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);
+ return POOL_FRONT (pool);
+}
- (void) (*dir->handler) (pfile);
+/* Allocate LEN bytes from a memory pool. */
+unsigned char *
+_cpp_pool_alloc (pool, len)
+ cpp_pool *pool;
+ unsigned int len;
+{
+ unsigned char *result = _cpp_pool_reserve (pool, len);
- if (! (dir->flags & EXPAND))
- restore_macro_expansion (pfile, prev_lvl);
-
- _cpp_skip_rest_of_line (pfile);
- cpp_pop_buffer (pfile);
- }
+ POOL_COMMIT (pool, len);
+ return result;
}
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