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Diffstat (limited to 'libcpp/lex.c')
| -rw-r--r-- | libcpp/lex.c | 1707 |
1 files changed, 1707 insertions, 0 deletions
diff --git a/libcpp/lex.c b/libcpp/lex.c new file mode 100644 index 0000000..df09bd6 --- /dev/null +++ b/libcpp/lex.c @@ -0,0 +1,1707 @@ +/* CPP Library - lexical analysis. + Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. + Contributed by Per Bothner, 1994-95. + Based on CCCP program by Paul Rubin, June 1986 + Adapted to ANSI C, Richard Stallman, Jan 1987 + Broken out to separate file, Zack Weinberg, Mar 2000 + +This program is free software; you can redistribute it and/or modify it +under the terms of the GNU General Public License as published by the +Free Software Foundation; either version 2, or (at your option) any +later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + +#include "config.h" +#include "system.h" +#include "cpplib.h" +#include "internal.h" + +enum spell_type +{ + SPELL_OPERATOR = 0, + SPELL_IDENT, + SPELL_LITERAL, + SPELL_NONE +}; + +struct token_spelling +{ + enum spell_type category; + const unsigned char *name; +}; + +static const unsigned char *const digraph_spellings[] = +{ U"%:", U"%:%:", U"<:", U":>", U"<%", U"%>" }; + +#define OP(e, s) { SPELL_OPERATOR, U s }, +#define TK(e, s) { SPELL_ ## s, U #e }, +static const struct token_spelling token_spellings[N_TTYPES] = { TTYPE_TABLE }; +#undef OP +#undef TK + +#define TOKEN_SPELL(token) (token_spellings[(token)->type].category) +#define TOKEN_NAME(token) (token_spellings[(token)->type].name) + +static void add_line_note (cpp_buffer *, const uchar *, unsigned int); +static int skip_line_comment (cpp_reader *); +static void skip_whitespace (cpp_reader *, cppchar_t); +static void lex_string (cpp_reader *, cpp_token *, const uchar *); +static void save_comment (cpp_reader *, cpp_token *, const uchar *, cppchar_t); +static void create_literal (cpp_reader *, cpp_token *, const uchar *, + unsigned int, enum cpp_ttype); +static bool warn_in_comment (cpp_reader *, _cpp_line_note *); +static int name_p (cpp_reader *, const cpp_string *); +static tokenrun *next_tokenrun (tokenrun *); + +static _cpp_buff *new_buff (size_t); + + +/* Utility routine: + + Compares, the token TOKEN to the NUL-terminated string STRING. + TOKEN must be a CPP_NAME. Returns 1 for equal, 0 for unequal. */ +int +cpp_ideq (const cpp_token *token, const char *string) +{ + if (token->type != CPP_NAME) + return 0; + + return !ustrcmp (NODE_NAME (token->val.node), (const uchar *) string); +} + +/* Record a note TYPE at byte POS into the current cleaned logical + line. */ +static void +add_line_note (cpp_buffer *buffer, const uchar *pos, unsigned int type) +{ + if (buffer->notes_used == buffer->notes_cap) + { + buffer->notes_cap = buffer->notes_cap * 2 + 200; + buffer->notes = XRESIZEVEC (_cpp_line_note, buffer->notes, + buffer->notes_cap); + } + + buffer->notes[buffer->notes_used].pos = pos; + buffer->notes[buffer->notes_used].type = type; + buffer->notes_used++; +} + +/* Returns with a logical line that contains no escaped newlines or + trigraphs. This is a time-critical inner loop. */ +void +_cpp_clean_line (cpp_reader *pfile) +{ + cpp_buffer *buffer; + const uchar *s; + uchar c, *d, *p; + + buffer = pfile->buffer; + buffer->cur_note = buffer->notes_used = 0; + buffer->cur = buffer->line_base = buffer->next_line; + buffer->need_line = false; + s = buffer->next_line - 1; + + if (!buffer->from_stage3) + { + /* Short circuit for the common case of an un-escaped line with + no trigraphs. The primary win here is by not writing any + data back to memory until we have to. */ + for (;;) + { + c = *++s; + if (c == '\n' || c == '\r') + { + d = (uchar *) s; + + if (s == buffer->rlimit) + goto done; + + /* DOS line ending? */ + if (c == '\r' && s[1] == '\n') + s++; + + if (s == buffer->rlimit) + goto done; + + /* check for escaped newline */ + p = d; + while (p != buffer->next_line && is_nvspace (p[-1])) + p--; + if (p == buffer->next_line || p[-1] != '\\') + goto done; + + /* Have an escaped newline; process it and proceed to + the slow path. */ + add_line_note (buffer, p - 1, p != d ? ' ' : '\\'); + d = p - 2; + buffer->next_line = p - 1; + break; + } + if (c == '?' && s[1] == '?' && _cpp_trigraph_map[s[2]]) + { + /* Have a trigraph. We may or may not have to convert + it. Add a line note regardless, for -Wtrigraphs. */ + add_line_note (buffer, s, s[2]); + if (CPP_OPTION (pfile, trigraphs)) + { + /* We do, and that means we have to switch to the + slow path. */ + d = (uchar *) s; + *d = _cpp_trigraph_map[s[2]]; + s += 2; + break; + } + } + } + + + for (;;) + { + c = *++s; + *++d = c; + + if (c == '\n' || c == '\r') + { + /* Handle DOS line endings. */ + if (c == '\r' && s != buffer->rlimit && s[1] == '\n') + s++; + if (s == buffer->rlimit) + break; + + /* Escaped? */ + p = d; + while (p != buffer->next_line && is_nvspace (p[-1])) + p--; + if (p == buffer->next_line || p[-1] != '\\') + break; + + add_line_note (buffer, p - 1, p != d ? ' ': '\\'); + d = p - 2; + buffer->next_line = p - 1; + } + else if (c == '?' && s[1] == '?' && _cpp_trigraph_map[s[2]]) + { + /* Add a note regardless, for the benefit of -Wtrigraphs. */ + add_line_note (buffer, d, s[2]); + if (CPP_OPTION (pfile, trigraphs)) + { + *d = _cpp_trigraph_map[s[2]]; + s += 2; + } + } + } + } + else + { + do + s++; + while (*s != '\n' && *s != '\r'); + d = (uchar *) s; + + /* Handle DOS line endings. */ + if (*s == '\r' && s != buffer->rlimit && s[1] == '\n') + s++; + } + + done: + *d = '\n'; + /* A sentinel note that should never be processed. */ + add_line_note (buffer, d + 1, '\n'); + buffer->next_line = s + 1; +} + +/* Return true if the trigraph indicated by NOTE should be warned + about in a comment. */ +static bool +warn_in_comment (cpp_reader *pfile, _cpp_line_note *note) +{ + const uchar *p; + + /* Within comments we don't warn about trigraphs, unless the + trigraph forms an escaped newline, as that may change + behavior. */ + if (note->type != '/') + return false; + + /* If -trigraphs, then this was an escaped newline iff the next note + is coincident. */ + if (CPP_OPTION (pfile, trigraphs)) + return note[1].pos == note->pos; + + /* Otherwise, see if this forms an escaped newline. */ + p = note->pos + 3; + while (is_nvspace (*p)) + p++; + + /* There might have been escaped newlines between the trigraph and the + newline we found. Hence the position test. */ + return (*p == '\n' && p < note[1].pos); +} + +/* Process the notes created by add_line_note as far as the current + location. */ +void +_cpp_process_line_notes (cpp_reader *pfile, int in_comment) +{ + cpp_buffer *buffer = pfile->buffer; + + for (;;) + { + _cpp_line_note *note = &buffer->notes[buffer->cur_note]; + unsigned int col; + + if (note->pos > buffer->cur) + break; + + buffer->cur_note++; + col = CPP_BUF_COLUMN (buffer, note->pos + 1); + + if (note->type == '\\' || note->type == ' ') + { + if (note->type == ' ' && !in_comment) + cpp_error_with_line (pfile, CPP_DL_WARNING, pfile->line_table->highest_line, col, + "backslash and newline separated by space"); + + if (buffer->next_line > buffer->rlimit) + { + cpp_error_with_line (pfile, CPP_DL_PEDWARN, pfile->line_table->highest_line, col, + "backslash-newline at end of file"); + /* Prevent "no newline at end of file" warning. */ + buffer->next_line = buffer->rlimit; + } + + buffer->line_base = note->pos; + CPP_INCREMENT_LINE (pfile, 0); + } + else if (_cpp_trigraph_map[note->type]) + { + if (CPP_OPTION (pfile, warn_trigraphs) + && (!in_comment || warn_in_comment (pfile, note))) + { + if (CPP_OPTION (pfile, trigraphs)) + cpp_error_with_line (pfile, CPP_DL_WARNING, pfile->line_table->highest_line, col, + "trigraph ??%c converted to %c", + note->type, + (int) _cpp_trigraph_map[note->type]); + else + { + cpp_error_with_line + (pfile, CPP_DL_WARNING, pfile->line_table->highest_line, col, + "trigraph ??%c ignored, use -trigraphs to enable", + note->type); + } + } + } + else + abort (); + } +} + +/* Skip a C-style block comment. We find the end of the comment by + seeing if an asterisk is before every '/' we encounter. Returns + nonzero if comment terminated by EOF, zero otherwise. + + Buffer->cur points to the initial asterisk of the comment. */ +bool +_cpp_skip_block_comment (cpp_reader *pfile) +{ + cpp_buffer *buffer = pfile->buffer; + const uchar *cur = buffer->cur; + uchar c; + + cur++; + if (*cur == '/') + cur++; + + for (;;) + { + /* People like decorating comments with '*', so check for '/' + instead for efficiency. */ + c = *cur++; + + if (c == '/') + { + if (cur[-2] == '*') + break; + + /* Warn about potential nested comments, but not if the '/' + comes immediately before the true comment delimiter. + Don't bother to get it right across escaped newlines. */ + if (CPP_OPTION (pfile, warn_comments) + && cur[0] == '*' && cur[1] != '/') + { + buffer->cur = cur; + cpp_error_with_line (pfile, CPP_DL_WARNING, + pfile->line_table->highest_line, CPP_BUF_COL (buffer), + "\"/*\" within comment"); + } + } + else if (c == '\n') + { + unsigned int cols; + buffer->cur = cur - 1; + _cpp_process_line_notes (pfile, true); + if (buffer->next_line >= buffer->rlimit) + return true; + _cpp_clean_line (pfile); + + cols = buffer->next_line - buffer->line_base; + CPP_INCREMENT_LINE (pfile, cols); + + cur = buffer->cur; + } + } + + buffer->cur = cur; + _cpp_process_line_notes (pfile, true); + return false; +} + +/* Skip a C++ line comment, leaving buffer->cur pointing to the + terminating newline. Handles escaped newlines. Returns nonzero + if a multiline comment. */ +static int +skip_line_comment (cpp_reader *pfile) +{ + cpp_buffer *buffer = pfile->buffer; + unsigned int orig_line = pfile->line_table->highest_line; + + while (*buffer->cur != '\n') + buffer->cur++; + + _cpp_process_line_notes (pfile, true); + return orig_line != pfile->line_table->highest_line; +} + +/* Skips whitespace, saving the next non-whitespace character. */ +static void +skip_whitespace (cpp_reader *pfile, cppchar_t c) +{ + cpp_buffer *buffer = pfile->buffer; + bool saw_NUL = false; + + do + { + /* Horizontal space always OK. */ + if (c == ' ' || c == '\t') + ; + /* Just \f \v or \0 left. */ + else if (c == '\0') + saw_NUL = true; + else if (pfile->state.in_directive && CPP_PEDANTIC (pfile)) + cpp_error_with_line (pfile, CPP_DL_PEDWARN, pfile->line_table->highest_line, + CPP_BUF_COL (buffer), + "%s in preprocessing directive", + c == '\f' ? "form feed" : "vertical tab"); + + c = *buffer->cur++; + } + /* We only want non-vertical space, i.e. ' ' \t \f \v \0. */ + while (is_nvspace (c)); + + if (saw_NUL) + cpp_error (pfile, CPP_DL_WARNING, "null character(s) ignored"); + + buffer->cur--; +} + +/* See if the characters of a number token are valid in a name (no + '.', '+' or '-'). */ +static int +name_p (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; +} + +/* After parsing an identifier or other sequence, produce a warning about + sequences not in NFC/NFKC. */ +static void +warn_about_normalization (cpp_reader *pfile, + const cpp_token *token, + const struct normalize_state *s) +{ + if (CPP_OPTION (pfile, warn_normalize) < NORMALIZE_STATE_RESULT (s) + && !pfile->state.skipping) + { + /* Make sure that the token is printed using UCNs, even + if we'd otherwise happily print UTF-8. */ + unsigned char *buf = XNEWVEC (unsigned char, cpp_token_len (token)); + size_t sz; + + sz = cpp_spell_token (pfile, token, buf, false) - buf; + if (NORMALIZE_STATE_RESULT (s) == normalized_C) + cpp_error_with_line (pfile, CPP_DL_WARNING, token->src_loc, 0, + "`%.*s' is not in NFKC", (int) sz, buf); + else + cpp_error_with_line (pfile, CPP_DL_WARNING, token->src_loc, 0, + "`%.*s' is not in NFC", (int) sz, buf); + } +} + +/* Returns TRUE if the sequence starting at buffer->cur is invalid in + an identifier. FIRST is TRUE if this starts an identifier. */ +static bool +forms_identifier_p (cpp_reader *pfile, int first, + struct normalize_state *state) +{ + cpp_buffer *buffer = pfile->buffer; + + if (*buffer->cur == '$') + { + if (!CPP_OPTION (pfile, dollars_in_ident)) + return false; + + buffer->cur++; + if (CPP_OPTION (pfile, warn_dollars) && !pfile->state.skipping) + { + CPP_OPTION (pfile, warn_dollars) = 0; + cpp_error (pfile, CPP_DL_PEDWARN, "'$' in identifier or number"); + } + + return true; + } + + /* Is this a syntactically valid UCN? */ + if (CPP_OPTION (pfile, extended_identifiers) + && *buffer->cur == '\\' + && (buffer->cur[1] == 'u' || buffer->cur[1] == 'U')) + { + buffer->cur += 2; + if (_cpp_valid_ucn (pfile, &buffer->cur, buffer->rlimit, 1 + !first, + state)) + return true; + buffer->cur -= 2; + } + + return false; +} + +/* Lex an identifier starting at BUFFER->CUR - 1. */ +static cpp_hashnode * +lex_identifier (cpp_reader *pfile, const uchar *base, bool starts_ucn, + struct normalize_state *nst) +{ + cpp_hashnode *result; + const uchar *cur; + unsigned int len; + unsigned int hash = HT_HASHSTEP (0, *base); + + cur = pfile->buffer->cur; + if (! starts_ucn) + while (ISIDNUM (*cur)) + { + hash = HT_HASHSTEP (hash, *cur); + cur++; + } + pfile->buffer->cur = cur; + if (starts_ucn || forms_identifier_p (pfile, false, nst)) + { + /* Slower version for identifiers containing UCNs (or $). */ + do { + while (ISIDNUM (*pfile->buffer->cur)) + { + pfile->buffer->cur++; + NORMALIZE_STATE_UPDATE_IDNUM (nst); + } + } while (forms_identifier_p (pfile, false, nst)); + result = _cpp_interpret_identifier (pfile, base, + pfile->buffer->cur - base); + } + else + { + len = cur - base; + hash = HT_HASHFINISH (hash, len); + + result = (cpp_hashnode *) + ht_lookup_with_hash (pfile->hash_table, base, len, hash, HT_ALLOC); + } + + /* Rarely, identifiers require diagnostics when lexed. */ + if (__builtin_expect ((result->flags & NODE_DIAGNOSTIC) + && !pfile->state.skipping, 0)) + { + /* It is allowed to poison the same identifier twice. */ + if ((result->flags & NODE_POISONED) && !pfile->state.poisoned_ok) + cpp_error (pfile, CPP_DL_ERROR, "attempt to use poisoned \"%s\"", + NODE_NAME (result)); + + /* Constraint 6.10.3.5: __VA_ARGS__ should only appear in the + replacement list of a variadic macro. */ + if (result == pfile->spec_nodes.n__VA_ARGS__ + && !pfile->state.va_args_ok) + cpp_error (pfile, CPP_DL_PEDWARN, + "__VA_ARGS__ can only appear in the expansion" + " of a C99 variadic macro"); + } + + return result; +} + +/* Lex a number to NUMBER starting at BUFFER->CUR - 1. */ +static void +lex_number (cpp_reader *pfile, cpp_string *number, + struct normalize_state *nst) +{ + const uchar *cur; + const uchar *base; + uchar *dest; + + base = pfile->buffer->cur - 1; + do + { + cur = pfile->buffer->cur; + + /* N.B. ISIDNUM does not include $. */ + while (ISIDNUM (*cur) || *cur == '.' || VALID_SIGN (*cur, cur[-1])) + { + cur++; + NORMALIZE_STATE_UPDATE_IDNUM (nst); + } + + pfile->buffer->cur = cur; + } + while (forms_identifier_p (pfile, false, nst)); + + number->len = cur - base; + dest = _cpp_unaligned_alloc (pfile, number->len + 1); + memcpy (dest, base, number->len); + dest[number->len] = '\0'; + number->text = dest; +} + +/* Create a token of type TYPE with a literal spelling. */ +static void +create_literal (cpp_reader *pfile, cpp_token *token, const uchar *base, + unsigned int len, enum cpp_ttype type) +{ + uchar *dest = _cpp_unaligned_alloc (pfile, len + 1); + + memcpy (dest, base, len); + dest[len] = '\0'; + token->type = type; + token->val.str.len = len; + token->val.str.text = dest; +} + +/* Lexes a string, character constant, or angle-bracketed header file + name. The stored string contains the spelling, including opening + quote and leading any leading 'L'. It returns the type of the + literal, or CPP_OTHER if it was not properly terminated. + + The spelling is NUL-terminated, but it is not guaranteed that this + is the first NUL since embedded NULs are preserved. */ +static void +lex_string (cpp_reader *pfile, cpp_token *token, const uchar *base) +{ + bool saw_NUL = false; + const uchar *cur; + cppchar_t terminator; + enum cpp_ttype type; + + cur = base; + terminator = *cur++; + if (terminator == 'L') + terminator = *cur++; + if (terminator == '\"') + type = *base == 'L' ? CPP_WSTRING: CPP_STRING; + else if (terminator == '\'') + type = *base == 'L' ? CPP_WCHAR: CPP_CHAR; + else + terminator = '>', type = CPP_HEADER_NAME; + + for (;;) + { + cppchar_t c = *cur++; + + /* In #include-style directives, terminators are not escapable. */ + if (c == '\\' && !pfile->state.angled_headers && *cur != '\n') + cur++; + else if (c == terminator) + break; + else if (c == '\n') + { + cur--; + type = CPP_OTHER; + break; + } + else if (c == '\0') + saw_NUL = true; + } + + if (saw_NUL && !pfile->state.skipping) + cpp_error (pfile, CPP_DL_WARNING, + "null character(s) preserved in literal"); + + if (type == CPP_OTHER && CPP_OPTION (pfile, lang) != CLK_ASM) + cpp_error (pfile, CPP_DL_PEDWARN, "missing terminating %c character", + (int) terminator); + + pfile->buffer->cur = cur; + create_literal (pfile, token, base, cur - base, type); +} + +/* The stored comment includes the comment start and any terminator. */ +static void +save_comment (cpp_reader *pfile, cpp_token *token, const unsigned char *from, + cppchar_t type) +{ + unsigned char *buffer; + unsigned int len, clen; + + len = pfile->buffer->cur - from + 1; /* + 1 for the initial '/'. */ + + /* C++ comments probably (not definitely) have moved past a new + line, which we don't want to save in the comment. */ + if (is_vspace (pfile->buffer->cur[-1])) + len--; + + /* If we are currently in a directive, then we need to store all + C++ comments as C comments internally, and so we need to + allocate a little extra space in that case. + + Note that the only time we encounter a directive here is + when we are saving comments in a "#define". */ + clen = (pfile->state.in_directive && type == '/') ? len + 2 : len; + + buffer = _cpp_unaligned_alloc (pfile, clen); + + token->type = CPP_COMMENT; + token->val.str.len = clen; + token->val.str.text = buffer; + + buffer[0] = '/'; + memcpy (buffer + 1, from, len - 1); + + /* Finish conversion to a C comment, if necessary. */ + if (pfile->state.in_directive && type == '/') + { + buffer[1] = '*'; + buffer[clen - 2] = '*'; + buffer[clen - 1] = '/'; + } +} + +/* Allocate COUNT tokens for RUN. */ +void +_cpp_init_tokenrun (tokenrun *run, unsigned int count) +{ + run->base = XNEWVEC (cpp_token, count); + run->limit = run->base + count; + run->next = NULL; +} + +/* Returns the next tokenrun, or creates one if there is none. */ +static tokenrun * +next_tokenrun (tokenrun *run) +{ + if (run->next == NULL) + { + run->next = XNEW (tokenrun); + run->next->prev = run; + _cpp_init_tokenrun (run->next, 250); + } + + return run->next; +} + +/* Allocate a single token that is invalidated at the same time as the + rest of the tokens on the line. Has its line and col set to the + same as the last lexed token, so that diagnostics appear in the + right place. */ +cpp_token * +_cpp_temp_token (cpp_reader *pfile) +{ + cpp_token *old, *result; + + old = pfile->cur_token - 1; + if (pfile->cur_token == pfile->cur_run->limit) + { + pfile->cur_run = next_tokenrun (pfile->cur_run); + pfile->cur_token = pfile->cur_run->base; + } + + result = pfile->cur_token++; + result->src_loc = old->src_loc; + return result; +} + +/* Lex a token into RESULT (external interface). Takes care of issues + like directive handling, token lookahead, multiple include + optimization and skipping. */ +const cpp_token * +_cpp_lex_token (cpp_reader *pfile) +{ + cpp_token *result; + + for (;;) + { + if (pfile->cur_token == pfile->cur_run->limit) + { + pfile->cur_run = next_tokenrun (pfile->cur_run); + pfile->cur_token = pfile->cur_run->base; + } + + if (pfile->lookaheads) + { + pfile->lookaheads--; + result = pfile->cur_token++; + } + else + result = _cpp_lex_direct (pfile); + + if (result->flags & BOL) + { + /* Is this a directive. If _cpp_handle_directive returns + false, it is an assembler #. */ + if (result->type == CPP_HASH + /* 6.10.3 p 11: Directives in a list of macro arguments + gives undefined behavior. This implementation + handles the directive as normal. */ + && pfile->state.parsing_args != 1) + { + if (_cpp_handle_directive (pfile, result->flags & PREV_WHITE)) + { + if (pfile->directive_result.type == CPP_PADDING) + continue; + result = &pfile->directive_result; + } + } + else if (pfile->state.in_deferred_pragma) + result = &pfile->directive_result; + + if (pfile->cb.line_change && !pfile->state.skipping) + pfile->cb.line_change (pfile, result, pfile->state.parsing_args); + } + + /* We don't skip tokens in directives. */ + if (pfile->state.in_directive || pfile->state.in_deferred_pragma) + break; + + /* Outside a directive, invalidate controlling macros. At file + EOF, _cpp_lex_direct takes care of popping the buffer, so we never + get here and MI optimization works. */ + pfile->mi_valid = false; + + if (!pfile->state.skipping || result->type == CPP_EOF) + break; + } + + return result; +} + +/* Returns true if a fresh line has been loaded. */ +bool +_cpp_get_fresh_line (cpp_reader *pfile) +{ + int return_at_eof; + + /* We can't get a new line until we leave the current directive. */ + if (pfile->state.in_directive) + return false; + + for (;;) + { + cpp_buffer *buffer = pfile->buffer; + + if (!buffer->need_line) + return true; + + if (buffer->next_line < buffer->rlimit) + { + _cpp_clean_line (pfile); + return true; + } + + /* First, get out of parsing arguments state. */ + if (pfile->state.parsing_args) + return false; + + /* End of buffer. Non-empty files should end in a newline. */ + if (buffer->buf != buffer->rlimit + && buffer->next_line > buffer->rlimit + && !buffer->from_stage3) + { + /* Only warn once. */ + buffer->next_line = buffer->rlimit; + cpp_error_with_line (pfile, CPP_DL_PEDWARN, pfile->line_table->highest_line, + CPP_BUF_COLUMN (buffer, buffer->cur), + "no newline at end of file"); + } + + return_at_eof = buffer->return_at_eof; + _cpp_pop_buffer (pfile); + if (pfile->buffer == NULL || return_at_eof) + return false; + } +} + +#define IF_NEXT_IS(CHAR, THEN_TYPE, ELSE_TYPE) \ + do \ + { \ + result->type = ELSE_TYPE; \ + if (*buffer->cur == CHAR) \ + buffer->cur++, result->type = THEN_TYPE; \ + } \ + while (0) + +/* Lex a token into pfile->cur_token, which is also incremented, to + get diagnostics pointing to the correct location. + + Does not handle issues such as token lookahead, multiple-include + optimization, directives, skipping etc. This function is only + suitable for use by _cpp_lex_token, and in special cases like + lex_expansion_token which doesn't care for any of these issues. + + When meeting a newline, returns CPP_EOF if parsing a directive, + otherwise returns to the start of the token buffer if permissible. + Returns the location of the lexed token. */ +cpp_token * +_cpp_lex_direct (cpp_reader *pfile) +{ + cppchar_t c; + cpp_buffer *buffer; + const unsigned char *comment_start; + cpp_token *result = pfile->cur_token++; + + fresh_line: + result->flags = 0; + buffer = pfile->buffer; + if (buffer->need_line) + { + if (pfile->state.in_deferred_pragma) + { + result->type = CPP_PRAGMA_EOL; + pfile->state.in_deferred_pragma = false; + if (!pfile->state.pragma_allow_expansion) + pfile->state.prevent_expansion--; + return result; + } + if (!_cpp_get_fresh_line (pfile)) + { + result->type = CPP_EOF; + if (!pfile->state.in_directive) + { + /* Tell the compiler the line number of the EOF token. */ + result->src_loc = pfile->line_table->highest_line; + result->flags = BOL; + } + return result; + } + if (!pfile->keep_tokens) + { + pfile->cur_run = &pfile->base_run; + result = pfile->base_run.base; + pfile->cur_token = result + 1; + } + result->flags = BOL; + if (pfile->state.parsing_args == 2) + result->flags |= PREV_WHITE; + } + buffer = pfile->buffer; + update_tokens_line: + result->src_loc = pfile->line_table->highest_line; + + skipped_white: + if (buffer->cur >= buffer->notes[buffer->cur_note].pos + && !pfile->overlaid_buffer) + { + _cpp_process_line_notes (pfile, false); + result->src_loc = pfile->line_table->highest_line; + } + c = *buffer->cur++; + + LINEMAP_POSITION_FOR_COLUMN (result->src_loc, pfile->line_table, + CPP_BUF_COLUMN (buffer, buffer->cur)); + + switch (c) + { + case ' ': case '\t': case '\f': case '\v': case '\0': + result->flags |= PREV_WHITE; + skip_whitespace (pfile, c); + goto skipped_white; + + case '\n': + if (buffer->cur < buffer->rlimit) + CPP_INCREMENT_LINE (pfile, 0); + buffer->need_line = true; + goto fresh_line; + + case '0': case '1': case '2': case '3': case '4': + case '5': case '6': case '7': case '8': case '9': + { + struct normalize_state nst = INITIAL_NORMALIZE_STATE; + result->type = CPP_NUMBER; + lex_number (pfile, &result->val.str, &nst); + warn_about_normalization (pfile, result, &nst); + break; + } + + case 'L': + /* 'L' may introduce wide characters or strings. */ + if (*buffer->cur == '\'' || *buffer->cur == '"') + { + lex_string (pfile, result, buffer->cur - 1); + break; + } + /* Fall through. */ + + case '_': + case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': + case 'g': case 'h': case 'i': case 'j': case 'k': case 'l': + case 'm': case 'n': case 'o': case 'p': case 'q': case 'r': + case 's': case 't': case 'u': case 'v': case 'w': case 'x': + case 'y': case 'z': + case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': + case 'G': case 'H': case 'I': case 'J': case 'K': + case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R': + case 'S': case 'T': case 'U': case 'V': case 'W': case 'X': + case 'Y': case 'Z': + result->type = CPP_NAME; + { + struct normalize_state nst = INITIAL_NORMALIZE_STATE; + result->val.node = lex_identifier (pfile, buffer->cur - 1, false, + &nst); + warn_about_normalization (pfile, result, &nst); + } + + /* Convert named operators to their proper types. */ + if (result->val.node->flags & NODE_OPERATOR) + { + result->flags |= NAMED_OP; + result->type = (enum cpp_ttype) result->val.node->directive_index; + } + break; + + case '\'': + case '"': + lex_string (pfile, result, buffer->cur - 1); + break; + + case '/': + /* A potential block or line comment. */ + comment_start = buffer->cur; + c = *buffer->cur; + + if (c == '*') + { + if (_cpp_skip_block_comment (pfile)) + cpp_error (pfile, CPP_DL_ERROR, "unterminated comment"); + } + else if (c == '/' && (CPP_OPTION (pfile, cplusplus_comments) + || cpp_in_system_header (pfile))) + { + /* Warn about comments only if pedantically GNUC89, and not + in system headers. */ + if (CPP_OPTION (pfile, lang) == CLK_GNUC89 && CPP_PEDANTIC (pfile) + && ! buffer->warned_cplusplus_comments) + { + cpp_error (pfile, CPP_DL_PEDWARN, + "C++ style comments are not allowed in ISO C90"); + cpp_error (pfile, CPP_DL_PEDWARN, + "(this will be reported only once per input file)"); + buffer->warned_cplusplus_comments = 1; + } + + if (skip_line_comment (pfile) && CPP_OPTION (pfile, warn_comments)) + cpp_error (pfile, CPP_DL_WARNING, "multi-line comment"); + } + else if (c == '=') + { + buffer->cur++; + result->type = CPP_DIV_EQ; + break; + } + else + { + result->type = CPP_DIV; + break; + } + + if (!pfile->state.save_comments) + { + result->flags |= PREV_WHITE; + goto update_tokens_line; + } + + /* Save the comment as a token in its own right. */ + save_comment (pfile, result, comment_start, c); + break; + + case '<': + if (pfile->state.angled_headers) + { + lex_string (pfile, result, buffer->cur - 1); + break; + } + + result->type = CPP_LESS; + if (*buffer->cur == '=') + buffer->cur++, result->type = CPP_LESS_EQ; + else if (*buffer->cur == '<') + { + buffer->cur++; + IF_NEXT_IS ('=', CPP_LSHIFT_EQ, CPP_LSHIFT); + } + else if (CPP_OPTION (pfile, digraphs)) + { + if (*buffer->cur == ':') + { + buffer->cur++; + result->flags |= DIGRAPH; + result->type = CPP_OPEN_SQUARE; + } + else if (*buffer->cur == '%') + { + buffer->cur++; + result->flags |= DIGRAPH; + result->type = CPP_OPEN_BRACE; + } + } + break; + + case '>': + result->type = CPP_GREATER; + if (*buffer->cur == '=') + buffer->cur++, result->type = CPP_GREATER_EQ; + else if (*buffer->cur == '>') + { + buffer->cur++; + IF_NEXT_IS ('=', CPP_RSHIFT_EQ, CPP_RSHIFT); + } + break; + + case '%': + result->type = CPP_MOD; + if (*buffer->cur == '=') + buffer->cur++, result->type = CPP_MOD_EQ; + else if (CPP_OPTION (pfile, digraphs)) + { + if (*buffer->cur == ':') + { + buffer->cur++; + result->flags |= DIGRAPH; + result->type = CPP_HASH; + if (*buffer->cur == '%' && buffer->cur[1] == ':') + buffer->cur += 2, result->type = CPP_PASTE; + } + else if (*buffer->cur == '>') + { + buffer->cur++; + result->flags |= DIGRAPH; + result->type = CPP_CLOSE_BRACE; + } + } + break; + + case '.': + result->type = CPP_DOT; + if (ISDIGIT (*buffer->cur)) + { + struct normalize_state nst = INITIAL_NORMALIZE_STATE; + result->type = CPP_NUMBER; + lex_number (pfile, &result->val.str, &nst); + warn_about_normalization (pfile, result, &nst); + } + else if (*buffer->cur == '.' && buffer->cur[1] == '.') + buffer->cur += 2, result->type = CPP_ELLIPSIS; + else if (*buffer->cur == '*' && CPP_OPTION (pfile, cplusplus)) + buffer->cur++, result->type = CPP_DOT_STAR; + break; + + case '+': + result->type = CPP_PLUS; + if (*buffer->cur == '+') + buffer->cur++, result->type = CPP_PLUS_PLUS; + else if (*buffer->cur == '=') + buffer->cur++, result->type = CPP_PLUS_EQ; + break; + + case '-': + result->type = CPP_MINUS; + if (*buffer->cur == '>') + { + buffer->cur++; + result->type = CPP_DEREF; + if (*buffer->cur == '*' && CPP_OPTION (pfile, cplusplus)) + buffer->cur++, result->type = CPP_DEREF_STAR; + } + else if (*buffer->cur == '-') + buffer->cur++, result->type = CPP_MINUS_MINUS; + else if (*buffer->cur == '=') + buffer->cur++, result->type = CPP_MINUS_EQ; + break; + + case '&': + result->type = CPP_AND; + if (*buffer->cur == '&') + buffer->cur++, result->type = CPP_AND_AND; + else if (*buffer->cur == '=') + buffer->cur++, result->type = CPP_AND_EQ; + break; + + case '|': + result->type = CPP_OR; + if (*buffer->cur == '|') + buffer->cur++, result->type = CPP_OR_OR; + else if (*buffer->cur == '=') + buffer->cur++, result->type = CPP_OR_EQ; + break; + + case ':': + result->type = CPP_COLON; + if (*buffer->cur == ':' && CPP_OPTION (pfile, cplusplus)) + buffer->cur++, result->type = CPP_SCOPE; + else if (*buffer->cur == '>' && CPP_OPTION (pfile, digraphs)) + { + buffer->cur++; + result->flags |= DIGRAPH; + result->type = CPP_CLOSE_SQUARE; + } + break; + + case '*': IF_NEXT_IS ('=', CPP_MULT_EQ, CPP_MULT); break; + case '=': IF_NEXT_IS ('=', CPP_EQ_EQ, CPP_EQ); break; + case '!': IF_NEXT_IS ('=', CPP_NOT_EQ, CPP_NOT); break; + case '^': IF_NEXT_IS ('=', CPP_XOR_EQ, CPP_XOR); break; + case '#': IF_NEXT_IS ('#', CPP_PASTE, CPP_HASH); break; + + case '?': result->type = CPP_QUERY; break; + case '~': result->type = CPP_COMPL; break; + case ',': result->type = CPP_COMMA; break; + case '(': result->type = CPP_OPEN_PAREN; break; + case ')': result->type = CPP_CLOSE_PAREN; break; + case '[': result->type = CPP_OPEN_SQUARE; break; + case ']': result->type = CPP_CLOSE_SQUARE; break; + case '{': result->type = CPP_OPEN_BRACE; break; + case '}': result->type = CPP_CLOSE_BRACE; break; + case ';': result->type = CPP_SEMICOLON; break; + + /* @ is a punctuator in Objective-C. */ + case '@': result->type = CPP_ATSIGN; break; + + case '$': + case '\\': + { + const uchar *base = --buffer->cur; + struct normalize_state nst = INITIAL_NORMALIZE_STATE; + + if (forms_identifier_p (pfile, true, &nst)) + { + result->type = CPP_NAME; + result->val.node = lex_identifier (pfile, base, true, &nst); + warn_about_normalization (pfile, result, &nst); + break; + } + buffer->cur++; + } + + default: + create_literal (pfile, result, buffer->cur - 1, 1, CPP_OTHER); + break; + } + + return result; +} + +/* An upper bound on the number of bytes needed to spell TOKEN. + Does not include preceding whitespace. */ +unsigned int +cpp_token_len (const cpp_token *token) +{ + unsigned int len; + + switch (TOKEN_SPELL (token)) + { + default: len = 4; break; + case SPELL_LITERAL: len = token->val.str.len; break; + case SPELL_IDENT: len = NODE_LEN (token->val.node) * 10; break; + } + + return len; +} + +/* Parse UTF-8 out of NAMEP and place a \U escape in BUFFER. + Return the number of bytes read out of NAME. (There are always + 10 bytes written to BUFFER.) */ + +static size_t +utf8_to_ucn (unsigned char *buffer, const unsigned char *name) +{ + int j; + int ucn_len = 0; + int ucn_len_c; + unsigned t; + unsigned long utf32; + + /* Compute the length of the UTF-8 sequence. */ + for (t = *name; t & 0x80; t <<= 1) + ucn_len++; + + utf32 = *name & (0x7F >> ucn_len); + for (ucn_len_c = 1; ucn_len_c < ucn_len; ucn_len_c++) + { + utf32 = (utf32 << 6) | (*++name & 0x3F); + + /* Ill-formed UTF-8. */ + if ((*name & ~0x3F) != 0x80) + abort (); + } + + *buffer++ = '\\'; + *buffer++ = 'U'; + for (j = 7; j >= 0; j--) + *buffer++ = "0123456789abcdef"[(utf32 >> (4 * j)) & 0xF]; + return ucn_len; +} + + +/* Write the spelling of a token TOKEN to BUFFER. The buffer must + already contain the enough space to hold the token's spelling. + Returns a pointer to the character after the last character written. + FORSTRING is true if this is to be the spelling after translation + phase 1 (this is different for UCNs). + FIXME: Would be nice if we didn't need the PFILE argument. */ +unsigned char * +cpp_spell_token (cpp_reader *pfile, const cpp_token *token, + unsigned char *buffer, bool forstring) +{ + switch (TOKEN_SPELL (token)) + { + case SPELL_OPERATOR: + { + const unsigned char *spelling; + unsigned char c; + + if (token->flags & DIGRAPH) + spelling + = digraph_spellings[(int) token->type - (int) CPP_FIRST_DIGRAPH]; + else if (token->flags & NAMED_OP) + goto spell_ident; + else + spelling = TOKEN_NAME (token); + + while ((c = *spelling++) != '\0') + *buffer++ = c; + } + break; + + spell_ident: + case SPELL_IDENT: + if (forstring) + { + memcpy (buffer, NODE_NAME (token->val.node), + NODE_LEN (token->val.node)); + buffer += NODE_LEN (token->val.node); + } + else + { + size_t i; + const unsigned char * name = NODE_NAME (token->val.node); + + for (i = 0; i < NODE_LEN (token->val.node); i++) + if (name[i] & ~0x7F) + { + i += utf8_to_ucn (buffer, name + i) - 1; + buffer += 10; + } + else + *buffer++ = NODE_NAME (token->val.node)[i]; + } + break; + + case SPELL_LITERAL: + memcpy (buffer, token->val.str.text, token->val.str.len); + buffer += token->val.str.len; + break; + + case SPELL_NONE: + cpp_error (pfile, CPP_DL_ICE, + "unspellable token %s", TOKEN_NAME (token)); + break; + } + + return buffer; +} + +/* Returns TOKEN spelt as a null-terminated string. The string is + freed when the reader is destroyed. Useful for diagnostics. */ +unsigned char * +cpp_token_as_text (cpp_reader *pfile, const cpp_token *token) +{ + unsigned int len = cpp_token_len (token) + 1; + unsigned char *start = _cpp_unaligned_alloc (pfile, len), *end; + + end = cpp_spell_token (pfile, token, start, false); + end[0] = '\0'; + + return start; +} + +/* Used by C front ends, which really should move to using + cpp_token_as_text. */ +const char * +cpp_type2name (enum cpp_ttype type) +{ + return (const char *) token_spellings[type].name; +} + +/* Writes the spelling of token to FP, without any preceding space. + Separated from cpp_spell_token for efficiency - to avoid stdio + double-buffering. */ +void +cpp_output_token (const cpp_token *token, FILE *fp) +{ + switch (TOKEN_SPELL (token)) + { + case SPELL_OPERATOR: + { + const unsigned char *spelling; + int c; + + if (token->flags & DIGRAPH) + spelling + = digraph_spellings[(int) token->type - (int) CPP_FIRST_DIGRAPH]; + else if (token->flags & NAMED_OP) + goto spell_ident; + else + spelling = TOKEN_NAME (token); + + c = *spelling; + do + putc (c, fp); + while ((c = *++spelling) != '\0'); + } + break; + + spell_ident: + case SPELL_IDENT: + { + size_t i; + const unsigned char * name = NODE_NAME (token->val.node); + + for (i = 0; i < NODE_LEN (token->val.node); i++) + if (name[i] & ~0x7F) + { + unsigned char buffer[10]; + i += utf8_to_ucn (buffer, name + i) - 1; + fwrite (buffer, 1, 10, fp); + } + else + fputc (NODE_NAME (token->val.node)[i], fp); + } + break; + + case SPELL_LITERAL: + fwrite (token->val.str.text, 1, token->val.str.len, fp); + break; + + case SPELL_NONE: + /* An error, most probably. */ + break; + } +} + +/* Compare two tokens. */ +int +_cpp_equiv_tokens (const cpp_token *a, const cpp_token *b) +{ + if (a->type == b->type && a->flags == b->flags) + switch (TOKEN_SPELL (a)) + { + default: /* Keep compiler happy. */ + case SPELL_OPERATOR: + return 1; + case SPELL_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_LITERAL: + return (a->val.str.len == b->val.str.len + && !memcmp (a->val.str.text, b->val.str.text, + a->val.str.len)); + } + + return 0; +} + +/* Returns nonzero if a space should be inserted to avoid an + accidental token paste for output. For simplicity, it is + conservative, and occasionally advises a space where one is not + needed, e.g. "." and ".2". */ +int +cpp_avoid_paste (cpp_reader *pfile, const cpp_token *token1, + const cpp_token *token2) +{ + enum cpp_ttype a = token1->type, b = token2->type; + cppchar_t c; + + if (token1->flags & NAMED_OP) + a = CPP_NAME; + if (token2->flags & NAMED_OP) + b = CPP_NAME; + + c = EOF; + if (token2->flags & DIGRAPH) + c = digraph_spellings[(int) b - (int) CPP_FIRST_DIGRAPH][0]; + else if (token_spellings[b].category == SPELL_OPERATOR) + c = token_spellings[b].name[0]; + + /* Quickly get everything that can paste with an '='. */ + if ((int) a <= (int) CPP_LAST_EQ && c == '=') + return 1; + + switch (a) + { + case CPP_GREATER: return c == '>'; + case CPP_LESS: return 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 == '-'); + /* UCNs */ + case CPP_OTHER: return ((token1->val.str.text[0] == '\\' + && b == CPP_NAME) + || (CPP_OPTION (pfile, objc) + && token1->val.str.text[0] == '@' + && (b == CPP_NAME || b == CPP_STRING))); + default: break; + } + + return 0; +} + +/* Output all the remaining tokens on the current line, and a newline + character, to FP. Leading whitespace is removed. If there are + macros, special token padding is not performed. */ +void +cpp_output_line (cpp_reader *pfile, FILE *fp) +{ + const cpp_token *token; + + token = cpp_get_token (pfile); + while (token->type != CPP_EOF) + { + cpp_output_token (token, fp); + token = cpp_get_token (pfile); + if (token->flags & PREV_WHITE) + putc (' ', fp); + } + + putc ('\n', fp); +} + +/* Memory buffers. Changing these three constants can have a dramatic + effect on performance. The values here are reasonable defaults, + but might be tuned. If you adjust them, be sure to test across a + range of uses of cpplib, including heavy nested function-like macro + expansion. Also check the change in peak memory usage (NJAMD is a + good tool for this). */ +#define MIN_BUFF_SIZE 8000 +#define BUFF_SIZE_UPPER_BOUND(MIN_SIZE) (MIN_BUFF_SIZE + (MIN_SIZE) * 3 / 2) +#define EXTENDED_BUFF_SIZE(BUFF, MIN_EXTRA) \ + (MIN_EXTRA + ((BUFF)->limit - (BUFF)->cur) * 2) + +#if MIN_BUFF_SIZE > BUFF_SIZE_UPPER_BOUND (0) + #error BUFF_SIZE_UPPER_BOUND must be at least as large as MIN_BUFF_SIZE! +#endif + +/* Create a new allocation buffer. Place the control block at the end + of the buffer, so that buffer overflows will cause immediate chaos. */ +static _cpp_buff * +new_buff (size_t len) +{ + _cpp_buff *result; + unsigned char *base; + + if (len < MIN_BUFF_SIZE) + len = MIN_BUFF_SIZE; + len = CPP_ALIGN (len); + + base = XNEWVEC (unsigned char, len + sizeof (_cpp_buff)); + result = (_cpp_buff *) (base + len); + result->base = base; + result->cur = base; + result->limit = base + len; + result->next = NULL; + return result; +} + +/* Place a chain of unwanted allocation buffers on the free list. */ +void +_cpp_release_buff (cpp_reader *pfile, _cpp_buff *buff) +{ + _cpp_buff *end = buff; + + while (end->next) + end = end->next; + end->next = pfile->free_buffs; + pfile->free_buffs = buff; +} + +/* Return a free buffer of size at least MIN_SIZE. */ +_cpp_buff * +_cpp_get_buff (cpp_reader *pfile, size_t min_size) +{ + _cpp_buff *result, **p; + + for (p = &pfile->free_buffs;; p = &(*p)->next) + { + size_t size; + + if (*p == NULL) + return new_buff (min_size); + result = *p; + size = result->limit - result->base; + /* Return a buffer that's big enough, but don't waste one that's + way too big. */ + if (size >= min_size && size <= BUFF_SIZE_UPPER_BOUND (min_size)) + break; + } + + *p = result->next; + result->next = NULL; + result->cur = result->base; + return result; +} + +/* Creates a new buffer with enough space to hold the uncommitted + remaining bytes of BUFF, and at least MIN_EXTRA more bytes. Copies + the excess bytes to the new buffer. Chains the new buffer after + BUFF, and returns the new buffer. */ +_cpp_buff * +_cpp_append_extend_buff (cpp_reader *pfile, _cpp_buff *buff, size_t min_extra) +{ + size_t size = EXTENDED_BUFF_SIZE (buff, min_extra); + _cpp_buff *new_buff = _cpp_get_buff (pfile, size); + + buff->next = new_buff; + memcpy (new_buff->base, buff->cur, BUFF_ROOM (buff)); + return new_buff; +} + +/* Creates a new buffer with enough space to hold the uncommitted + remaining bytes of the buffer pointed to by BUFF, and at least + MIN_EXTRA more bytes. Copies the excess bytes to the new buffer. + Chains the new buffer before the buffer pointed to by BUFF, and + updates the pointer to point to the new buffer. */ +void +_cpp_extend_buff (cpp_reader *pfile, _cpp_buff **pbuff, size_t min_extra) +{ + _cpp_buff *new_buff, *old_buff = *pbuff; + size_t size = EXTENDED_BUFF_SIZE (old_buff, min_extra); + + new_buff = _cpp_get_buff (pfile, size); + memcpy (new_buff->base, old_buff->cur, BUFF_ROOM (old_buff)); + new_buff->next = old_buff; + *pbuff = new_buff; +} + +/* Free a chain of buffers starting at BUFF. */ +void +_cpp_free_buff (_cpp_buff *buff) +{ + _cpp_buff *next; + + for (; buff; buff = next) + { + next = buff->next; + free (buff->base); + } +} + +/* Allocate permanent, unaligned storage of length LEN. */ +unsigned char * +_cpp_unaligned_alloc (cpp_reader *pfile, size_t len) +{ + _cpp_buff *buff = pfile->u_buff; + unsigned char *result = buff->cur; + + if (len > (size_t) (buff->limit - result)) + { + buff = _cpp_get_buff (pfile, len); + buff->next = pfile->u_buff; + pfile->u_buff = buff; + result = buff->cur; + } + + buff->cur = result + len; + return result; +} + +/* Allocate permanent, unaligned storage of length LEN from a_buff. + That buffer is used for growing allocations when saving macro + replacement lists in a #define, and when parsing an answer to an + assertion in #assert, #unassert or #if (and therefore possibly + whilst expanding macros). It therefore must not be used by any + code that they might call: specifically the lexer and the guts of + the macro expander. + + All existing other uses clearly fit this restriction: storing + registered pragmas during initialization. */ +unsigned char * +_cpp_aligned_alloc (cpp_reader *pfile, size_t len) +{ + _cpp_buff *buff = pfile->a_buff; + unsigned char *result = buff->cur; + + if (len > (size_t) (buff->limit - result)) + { + buff = _cpp_get_buff (pfile, len); + buff->next = pfile->a_buff; + pfile->a_buff = buff; + result = buff->cur; + } + + buff->cur = result + len; + return result; +} + +/* Say which field of TOK is in use. */ + +enum cpp_token_fld_kind +cpp_token_val_index (cpp_token *tok) +{ + switch (TOKEN_SPELL (tok)) + { + case SPELL_IDENT: + return CPP_TOKEN_FLD_NODE; + case SPELL_LITERAL: + return CPP_TOKEN_FLD_STR; + case SPELL_NONE: + if (tok->type == CPP_MACRO_ARG) + return CPP_TOKEN_FLD_ARG_NO; + else if (tok->type == CPP_PADDING) + return CPP_TOKEN_FLD_SOURCE; + else if (tok->type == CPP_PRAGMA) + return CPP_TOKEN_FLD_PRAGMA; + /* else fall through */ + default: + return CPP_TOKEN_FLD_NONE; + } +} |
