2 * This file is part of cparser.
3 * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
22 #include "diagnostic.h"
26 #include "symbol_table_t.h"
27 #include "adt/error.h"
28 #include "adt/strset.h"
32 #include "target_architecture.h"
35 #include "lang_features.h"
51 #if defined(_WIN32) || defined(__CYGWIN__)
52 /* No strtold on windows and no replacement yet */
53 #define strtold(s, e) strtod(s, e)
60 static utf32 buf[BUF_SIZE + MAX_PUTBACK];
61 static const utf32 *bufend;
62 static const utf32 *bufpos;
63 static strset_t stringset;
64 bool allow_dollar_in_symbol = true;
67 * Prints a parse error message at the current token.
69 * @param msg the error message
71 static void parse_error(const char *msg)
73 errorf(&lexer_token.source_position, "%s", msg);
77 * Prints an internal error message at the current token.
79 * @param msg the error message
81 static NORETURN internal_error(const char *msg)
83 internal_errorf(&lexer_token.source_position, "%s", msg);
86 static size_t read_block(unsigned char *const read_buf, size_t const n)
88 size_t const s = fread(read_buf, 1, n, input);
91 parse_error("read from input failed");
92 buf[MAX_PUTBACK] = EOF;
93 bufpos = buf + MAX_PUTBACK;
94 bufend = buf + MAX_PUTBACK + 1;
99 static void decode_iso_8859_1(void)
101 unsigned char read_buf[BUF_SIZE];
102 size_t const s = read_block(read_buf, sizeof(read_buf));
106 unsigned char const *src = read_buf;
107 unsigned char const *end = read_buf + s;
108 utf32 *dst = buf + MAX_PUTBACK;
112 bufpos = buf + MAX_PUTBACK;
116 static void decode_iso_8859_15(void)
118 unsigned char read_buf[BUF_SIZE];
119 size_t const s = read_block(read_buf, sizeof(read_buf));
123 unsigned char const *src = read_buf;
124 unsigned char const *end = read_buf + s;
125 utf32 *dst = buf + MAX_PUTBACK;
129 case 0xA4: tc = 0x20AC; break; // €
130 case 0xA6: tc = 0x0160; break; // Š
131 case 0xA8: tc = 0x0161; break; // š
132 case 0xB4: tc = 0x017D; break; // Ž
133 case 0xB8: tc = 0x017E; break; // ž
134 case 0xBC: tc = 0x0152; break; // Œ
135 case 0xBD: tc = 0x0153; break; // œ
136 case 0xBE: tc = 0x0178; break; // Ÿ
141 bufpos = buf + MAX_PUTBACK;
145 static void decode_utf8(void)
147 static utf32 part_decoded_min_code;
148 static utf32 part_decoded_char;
149 static size_t part_decoded_rest_len;
152 unsigned char read_buf[BUF_SIZE];
153 size_t const s = read_block(read_buf, sizeof(read_buf));
155 if (part_decoded_rest_len > 0)
156 parse_error("incomplete input char at end of input");
160 unsigned char const *src = read_buf;
161 unsigned char const *end = read_buf + s;
162 utf32 *dst = buf + MAX_PUTBACK;
166 if (part_decoded_rest_len != 0) {
167 min_code = part_decoded_min_code;
168 decoded = part_decoded_char;
169 size_t const rest_len = part_decoded_rest_len;
170 part_decoded_rest_len = 0;
172 case 4: goto realign;
173 case 3: goto three_more;
174 case 2: goto two_more;
175 default: goto one_more;
180 if ((*src & 0x80) == 0) {
182 } else if ((*src & 0xE0) == 0xC0) {
184 decoded = *src++ & 0x1F;
187 part_decoded_min_code = min_code;
188 part_decoded_char = decoded;
189 part_decoded_rest_len = 1;
192 if ((*src & 0xC0) == 0x80) {
193 decoded = (decoded << 6) | (*src++ & 0x3F);
197 if (decoded < min_code ||
198 decoded > 0x10FFFF ||
199 (0xD800 <= decoded && decoded < 0xE000) || // high/low surrogates
200 (0xFDD0 <= decoded && decoded < 0xFDF0) || // noncharacters
201 (decoded & 0xFFFE) == 0xFFFE) { // noncharacters
202 parse_error("invalid byte sequence in input");
204 } else if ((*src & 0xF0) == 0xE0) {
206 decoded = *src++ & 0x0F;
209 part_decoded_min_code = min_code;
210 part_decoded_char = decoded;
211 part_decoded_rest_len = 2;
214 if ((*src & 0xC0) == 0x80) {
215 decoded = (decoded << 6) | (*src++ & 0x3F);
220 } else if ((*src & 0xF8) == 0xF0) {
222 decoded = *src++ & 0x07;
225 part_decoded_min_code = min_code;
226 part_decoded_char = decoded;
227 part_decoded_rest_len = 3;
230 if ((*src & 0xC0) == 0x80) {
231 decoded = (decoded << 6) | (*src++ & 0x3F);
238 parse_error("invalid byte sequence in input");
243 part_decoded_rest_len = 4;
246 } while ((*src & 0xC0) == 0x80 || (*src & 0xF8) == 0xF8);
252 bufpos = buf + MAX_PUTBACK;
254 } while (bufpos == bufend);
257 static void decode_windows_1252(void)
259 unsigned char read_buf[BUF_SIZE];
260 size_t const s = read_block(read_buf, sizeof(read_buf));
264 unsigned char const *src = read_buf;
265 unsigned char const *end = read_buf + s;
266 utf32 *dst = buf + MAX_PUTBACK;
270 case 0x80: tc = 0x20AC; break; // €
271 case 0x82: tc = 0x201A; break; // ‚
272 case 0x83: tc = 0x0192; break; // ƒ
273 case 0x84: tc = 0x201E; break; // „
274 case 0x85: tc = 0x2026; break; // …
275 case 0x86: tc = 0x2020; break; // †
276 case 0x87: tc = 0x2021; break; // ‡
277 case 0x88: tc = 0x02C6; break; // ˆ
278 case 0x89: tc = 0x2030; break; // ‰
279 case 0x8A: tc = 0x0160; break; // Š
280 case 0x8B: tc = 0x2039; break; // ‹
281 case 0x8C: tc = 0x0152; break; // Œ
282 case 0x8E: tc = 0x017D; break; // Ž
283 case 0x91: tc = 0x2018; break; // ‘
284 case 0x92: tc = 0x2019; break; // ’
285 case 0x93: tc = 0x201C; break; // “
286 case 0x94: tc = 0x201D; break; // ”
287 case 0x95: tc = 0x2022; break; // •
288 case 0x96: tc = 0x2013; break; // –
289 case 0x97: tc = 0x2014; break; // —
290 case 0x98: tc = 0x02DC; break; // ˜
291 case 0x99: tc = 0x2122; break; // ™
292 case 0x9A: tc = 0x0161; break; // š
293 case 0x9B: tc = 0x203A; break; // ›
294 case 0x9C: tc = 0x0153; break; // œ
295 case 0x9E: tc = 0x017E; break; // ž
296 case 0x9F: tc = 0x0178; break; // Ÿ
301 bufpos = buf + MAX_PUTBACK;
305 typedef void (*decoder_t)(void);
307 static decoder_t decoder = decode_utf8;
309 typedef struct named_decoder_t {
314 static named_decoder_t const decoders[] = {
315 { "CP819", decode_iso_8859_1 }, // offical alias
316 { "IBM819", decode_iso_8859_1 }, // offical alias
317 { "ISO-8859-1", decode_iso_8859_1 }, // offical alias
318 { "ISO-8859-15", decode_iso_8859_15 }, // offical name
319 { "ISO8859-1", decode_iso_8859_1 },
320 { "ISO8859-15", decode_iso_8859_15 },
321 { "ISO_8859-1", decode_iso_8859_1 }, // offical alias
322 { "ISO_8859-15", decode_iso_8859_15 }, // offical alias
323 { "ISO_8859-1:1987", decode_iso_8859_1 }, // offical name
324 { "Latin-9", decode_iso_8859_15 }, // offical alias
325 { "UTF-8", decode_utf8 }, // offical name
326 { "csISOLatin1", decode_iso_8859_1 }, // offical alias
327 { "cp1252", decode_windows_1252 },
328 { "iso-ir-100", decode_iso_8859_1 }, // offical alias
329 { "l1", decode_iso_8859_1 }, // offical alias
330 { "latin1", decode_iso_8859_1 }, // offical alias
331 { "windows-1252", decode_windows_1252 }, // official name
336 void select_input_encoding(char const* const encoding)
338 for (named_decoder_t const *i = decoders; i->name != NULL; ++i) {
339 if (strcasecmp(encoding, i->name) != 0)
341 decoder = i->decoder;
344 fprintf(stderr, "error: input encoding \"%s\" not supported\n", encoding);
347 static inline void next_real_char(void)
349 assert(bufpos <= bufend);
350 if (bufpos >= bufend) {
361 * Put a character back into the buffer.
363 * @param pc the character to put back
365 static inline void put_back(utf32 const pc)
367 assert(bufpos > buf);
368 *(--bufpos - buf + buf) = pc;
371 printf("putback '%lc'\n", pc);
375 static inline void next_char(void);
377 #define MATCH_NEWLINE(code) \
383 lexer_token.source_position.linenr++; \
387 lexer_token.source_position.linenr++; \
390 #define eat(c_type) do { assert(c == c_type); next_char(); } while (0)
392 static void maybe_concat_lines(void)
397 MATCH_NEWLINE(return;)
408 * Set c to the next input character, ie.
409 * after expanding trigraphs.
411 static inline void next_char(void)
415 /* filter trigraphs */
416 if (UNLIKELY(c == '\\')) {
417 maybe_concat_lines();
418 goto end_of_next_char;
421 if (LIKELY(c != '?'))
422 goto end_of_next_char;
425 if (LIKELY(c != '?')) {
428 goto end_of_next_char;
433 case '=': c = '#'; break;
434 case '(': c = '['; break;
435 case '/': c = '\\'; maybe_concat_lines(); break;
436 case ')': c = ']'; break;
437 case '\'': c = '^'; break;
438 case '<': c = '{'; break;
439 case '!': c = '|'; break;
440 case '>': c = '}'; break;
441 case '-': c = '~'; break;
451 printf("nchar '%c'\n", c);
455 #define SYMBOL_CHARS \
456 case '$': if (!allow_dollar_in_symbol) goto dollar_sign; \
524 * Read a symbol from the input and build
527 static void parse_symbol(void)
529 obstack_1grow(&symbol_obstack, (char) c);
536 obstack_1grow(&symbol_obstack, (char) c);
547 obstack_1grow(&symbol_obstack, '\0');
549 char *string = obstack_finish(&symbol_obstack);
550 symbol_t *symbol = symbol_table_insert(string);
552 lexer_token.type = symbol->ID;
553 lexer_token.symbol = symbol;
555 if (symbol->string != string) {
556 obstack_free(&symbol_obstack, string);
561 * parse suffixes like 'LU' or 'f' after numbers
563 static void parse_number_suffix(void)
565 assert(obstack_object_size(&symbol_obstack) == 0);
569 obstack_1grow(&symbol_obstack, (char) c);
578 if (obstack_object_size(&symbol_obstack) == 0) {
579 lexer_token.symbol = NULL;
583 obstack_1grow(&symbol_obstack, '\0');
584 char *string = obstack_finish(&symbol_obstack);
585 symbol_t *symbol = symbol_table_insert(string);
587 if (symbol->string != string) {
588 obstack_free(&symbol_obstack, string);
590 lexer_token.symbol = symbol;
593 static string_t identify_string(char *string, size_t len)
597 const char *result = strset_insert(&stringset, concat);
598 if (result != concat) {
599 obstack_free(&symbol_obstack, concat);
602 const char *result = string;
604 return (string_t) {result, len};
608 * Parses a hex number including hex floats and set the
611 static void parse_number_hex(void)
613 bool is_float = false;
614 bool has_digits = false;
616 assert(obstack_object_size(&symbol_obstack) == 0);
617 while (isxdigit(c)) {
619 obstack_1grow(&symbol_obstack, (char) c);
625 obstack_1grow(&symbol_obstack, (char) c);
628 while (isxdigit(c)) {
630 obstack_1grow(&symbol_obstack, (char) c);
634 if (c == 'p' || c == 'P') {
636 obstack_1grow(&symbol_obstack, (char) c);
639 if (c == '-' || c == '+') {
640 obstack_1grow(&symbol_obstack, (char) c);
644 while (isxdigit(c)) {
645 obstack_1grow(&symbol_obstack, (char) c);
648 } else if (is_float) {
649 errorf(&lexer_token.source_position,
650 "hexadecimal floatingpoint constant requires an exponent");
653 size_t size = obstack_object_size(&symbol_obstack);
654 char *string = obstack_finish(&symbol_obstack);
655 lexer_token.literal = identify_string(string, size);
658 is_float ? T_FLOATINGPOINT_HEXADECIMAL : T_INTEGER_HEXADECIMAL;
661 errorf(&lexer_token.source_position, "invalid number literal '0x%S'",
662 &lexer_token.literal);
663 lexer_token.literal.begin = "0";
664 lexer_token.literal.size = 1;
667 parse_number_suffix();
671 * Returns true if the given char is a octal digit.
673 * @param char the character to check
675 static bool is_octal_digit(utf32 chr)
693 * Parses a number and sets the lexer_token.
695 static void parse_number(void)
697 bool is_float = false;
698 bool has_digits = false;
700 assert(obstack_object_size(&symbol_obstack) == 0);
703 if (c == 'x' || c == 'X') {
710 obstack_1grow(&symbol_obstack, '0');
715 obstack_1grow(&symbol_obstack, (char) c);
721 obstack_1grow(&symbol_obstack, '.');
726 obstack_1grow(&symbol_obstack, (char) c);
730 if (c == 'e' || c == 'E') {
732 obstack_1grow(&symbol_obstack, 'e');
735 if (c == '-' || c == '+') {
736 obstack_1grow(&symbol_obstack, (char) c);
741 obstack_1grow(&symbol_obstack, (char) c);
746 size_t size = obstack_object_size(&symbol_obstack);
747 char *string = obstack_finish(&symbol_obstack);
748 lexer_token.literal = identify_string(string, size);
750 /* is it an octal number? */
752 lexer_token.type = T_FLOATINGPOINT;
753 } else if (string[0] == '0') {
754 lexer_token.type = T_INTEGER_OCTAL;
756 /* check for invalid octal digits */
757 for (size_t i= 0; i < size; ++i) {
759 if (t == '8' || t == '9')
760 errorf(&lexer_token.source_position,
761 "invalid digit '%c' in octal number", t);
764 lexer_token.type = T_INTEGER;
768 errorf(&lexer_token.source_position, "invalid number literal '%S'",
769 &lexer_token.literal);
772 parse_number_suffix();
776 * Returns the value of a digit.
777 * The only portable way to do it ...
779 static int digit_value(utf32 const digit)
805 internal_error("wrong character given");
810 * Parses an octal character sequence.
812 * @param first_digit the already read first digit
814 static utf32 parse_octal_sequence(utf32 const first_digit)
816 assert(is_octal_digit(first_digit));
817 utf32 value = digit_value(first_digit);
818 if (!is_octal_digit(c)) return value;
819 value = 8 * value + digit_value(c);
821 if (!is_octal_digit(c)) return value;
822 value = 8 * value + digit_value(c);
828 * Parses a hex character sequence.
830 static utf32 parse_hex_sequence(void)
833 while (isxdigit(c)) {
834 value = 16 * value + digit_value(c);
841 * Parse an escape sequence.
843 static utf32 parse_escape_sequence(void)
851 case '"': return '"';
852 case '\'': return '\'';
853 case '\\': return '\\';
854 case '?': return '\?';
855 case 'a': return '\a';
856 case 'b': return '\b';
857 case 'f': return '\f';
858 case 'n': return '\n';
859 case 'r': return '\r';
860 case 't': return '\t';
861 case 'v': return '\v';
863 return parse_hex_sequence();
872 return parse_octal_sequence(ec);
874 parse_error("reached end of file while parsing escape sequence");
876 /* \E is not documented, but handled, by GCC. It is acceptable according
877 * to §6.11.4, whereas \e is not. */
881 return 27; /* hopefully 27 is ALWAYS the code for ESCAPE */
885 parse_error("universal character parsing not implemented yet");
890 /* §6.4.4.4:8 footnote 64 */
891 parse_error("unknown escape sequence");
896 * Concatenate two strings.
898 string_t concat_strings(const string_t *const s1, const string_t *const s2)
900 const size_t len1 = s1->size - 1;
901 const size_t len2 = s2->size - 1;
903 char *const concat = obstack_alloc(&symbol_obstack, len1 + len2 + 1);
904 memcpy(concat, s1->begin, len1);
905 memcpy(concat + len1, s2->begin, len2 + 1);
907 return identify_string(concat, len1 + len2 + 1);
910 string_t make_string(const char *string)
912 size_t len = strlen(string) + 1;
913 char *const space = obstack_alloc(&symbol_obstack, len);
914 memcpy(space, string, len);
916 return identify_string(space, len);
919 static void grow_symbol(utf32 const tc)
921 struct obstack *const o = &symbol_obstack;
923 obstack_1grow(o, tc);
924 } else if (tc < 0x800) {
925 obstack_1grow(o, 0xC0 | (tc >> 6));
926 obstack_1grow(o, 0x80 | (tc & 0x3F));
927 } else if (tc < 0x10000) {
928 obstack_1grow(o, 0xE0 | ( tc >> 12));
929 obstack_1grow(o, 0x80 | ((tc >> 6) & 0x3F));
930 obstack_1grow(o, 0x80 | ( tc & 0x3F));
932 obstack_1grow(o, 0xF0 | ( tc >> 18));
933 obstack_1grow(o, 0x80 | ((tc >> 12) & 0x3F));
934 obstack_1grow(o, 0x80 | ((tc >> 6) & 0x3F));
935 obstack_1grow(o, 0x80 | ( tc & 0x3F));
940 * Parse a string literal and set lexer_token.
942 static void parse_string_literal(void)
944 const unsigned start_linenr = lexer_token.source_position.linenr;
951 utf32 const tc = parse_escape_sequence();
953 warningf(&lexer_token.source_position,
954 "escape sequence out of range");
956 obstack_1grow(&symbol_obstack, tc);
961 source_position_t source_position;
962 source_position.input_name = lexer_token.source_position.input_name;
963 source_position.linenr = start_linenr;
964 errorf(&source_position, "string has no end");
965 lexer_token.type = T_ERROR;
982 /* TODO: concatenate multiple strings separated by whitespace... */
984 /* add finishing 0 to the string */
985 obstack_1grow(&symbol_obstack, '\0');
986 const size_t size = (size_t)obstack_object_size(&symbol_obstack);
987 char *string = obstack_finish(&symbol_obstack);
989 lexer_token.type = T_STRING_LITERAL;
990 lexer_token.literal = identify_string(string, size);
994 * Parse a wide character constant and set lexer_token.
996 static void parse_wide_character_constant(void)
998 const unsigned start_linenr = lexer_token.source_position.linenr;
1005 const utf32 tc = parse_escape_sequence();
1011 parse_error("newline while parsing character constant");
1017 goto end_of_wide_char_constant;
1020 source_position_t source_position = lexer_token.source_position;
1021 source_position.linenr = start_linenr;
1022 errorf(&source_position, "EOF while parsing character constant");
1023 lexer_token.type = T_ERROR;
1034 end_of_wide_char_constant:;
1035 size_t size = (size_t) obstack_object_size(&symbol_obstack);
1036 char *string = obstack_finish(&symbol_obstack);
1038 lexer_token.type = T_WIDE_CHARACTER_CONSTANT;
1039 lexer_token.literal = identify_string(string, size);
1043 * Parse a wide string literal and set lexer_token.
1045 static void parse_wide_string_literal(void)
1047 parse_string_literal();
1048 if (lexer_token.type == T_STRING_LITERAL)
1049 lexer_token.type = T_WIDE_STRING_LITERAL;
1053 * Parse a character constant and set lexer_token.
1055 static void parse_character_constant(void)
1057 const unsigned start_linenr = lexer_token.source_position.linenr;
1064 utf32 const tc = parse_escape_sequence();
1066 warningf(&lexer_token.source_position,
1067 "escape sequence out of range");
1069 obstack_1grow(&symbol_obstack, tc);
1074 parse_error("newline while parsing character constant");
1080 goto end_of_char_constant;
1083 source_position_t source_position;
1084 source_position.input_name = lexer_token.source_position.input_name;
1085 source_position.linenr = start_linenr;
1086 errorf(&source_position, "EOF while parsing character constant");
1087 lexer_token.type = T_ERROR;
1099 end_of_char_constant:;
1100 const size_t size = (size_t)obstack_object_size(&symbol_obstack);
1101 char *const string = obstack_finish(&symbol_obstack);
1103 lexer_token.type = T_CHARACTER_CONSTANT;
1104 lexer_token.literal = identify_string(string, size);
1108 * Skip a multiline comment.
1110 static void skip_multiline_comment(void)
1112 unsigned start_linenr = lexer_token.source_position.linenr;
1119 /* nested comment, warn here */
1120 if (warning.comment) {
1121 warningf(&lexer_token.source_position, "'/*' within comment");
1133 MATCH_NEWLINE(break;)
1136 source_position_t source_position;
1137 source_position.input_name = lexer_token.source_position.input_name;
1138 source_position.linenr = start_linenr;
1139 errorf(&source_position, "at end of file while looking for comment end");
1151 * Skip a single line comment.
1153 static void skip_line_comment(void)
1166 if (c == '\n' || c == '\r') {
1167 if (warning.comment)
1168 warningf(&lexer_token.source_position, "multi-line comment");
1180 /** The current preprocessor token. */
1181 static token_t pp_token;
1184 * Read the next preprocessor token.
1186 static inline void next_pp_token(void)
1188 lexer_next_preprocessing_token();
1189 pp_token = lexer_token;
1193 * Eat all preprocessor tokens until newline.
1195 static void eat_until_newline(void)
1197 while (pp_token.type != '\n' && pp_token.type != T_EOF) {
1203 * Handle the define directive.
1205 static void define_directive(void)
1207 lexer_next_preprocessing_token();
1208 if (lexer_token.type != T_IDENTIFIER) {
1209 parse_error("expected identifier after #define\n");
1210 eat_until_newline();
1215 * Handle the ifdef directive.
1217 static void ifdef_directive(int is_ifndef)
1220 lexer_next_preprocessing_token();
1221 //expect_identifier();
1226 * Handle the endif directive.
1228 static void endif_directive(void)
1234 * Parse the line directive.
1236 static void parse_line_directive(void)
1238 if (pp_token.type != T_INTEGER) {
1239 parse_error("expected integer");
1241 lexer_token.source_position.linenr = atoi(pp_token.literal.begin);
1244 if (pp_token.type == T_STRING_LITERAL) {
1245 lexer_token.source_position.input_name = pp_token.literal.begin;
1249 eat_until_newline();
1255 typedef enum stdc_pragma_kind_t {
1259 STDC_CX_LIMITED_RANGE
1260 } stdc_pragma_kind_t;
1263 * STDC pragma values.
1265 typedef enum stdc_pragma_value_kind_t {
1270 } stdc_pragma_value_kind_t;
1273 * Parse a pragma directive.
1275 static void parse_pragma(void)
1277 bool unknown_pragma = true;
1280 if (pp_token.symbol->pp_ID == TP_STDC) {
1281 stdc_pragma_kind_t kind = STDC_UNKNOWN;
1283 if (c_mode & _C99) {
1286 switch (pp_token.symbol->pp_ID) {
1287 case TP_FP_CONTRACT:
1288 kind = STDC_FP_CONTRACT;
1290 case TP_FENV_ACCESS:
1291 kind = STDC_FENV_ACCESS;
1293 case TP_CX_LIMITED_RANGE:
1294 kind = STDC_CX_LIMITED_RANGE;
1299 if (kind != STDC_UNKNOWN) {
1300 stdc_pragma_value_kind_t value = STDC_VALUE_UNKNOWN;
1302 switch (pp_token.symbol->pp_ID) {
1304 value = STDC_VALUE_ON;
1307 value = STDC_VALUE_OFF;
1310 value = STDC_VALUE_DEFAULT;
1315 if (value != STDC_VALUE_UNKNOWN) {
1316 unknown_pragma = false;
1318 errorf(&pp_token.source_position, "bad STDC pragma argument");
1323 unknown_pragma = true;
1325 eat_until_newline();
1326 if (unknown_pragma && warning.unknown_pragmas) {
1327 warningf(&pp_token.source_position, "encountered unknown #pragma");
1332 * Parse a preprocessor non-null directive.
1334 static void parse_preprocessor_identifier(void)
1336 assert(pp_token.type == T_IDENTIFIER);
1337 symbol_t *symbol = pp_token.symbol;
1339 switch (symbol->pp_ID) {
1341 printf("include - enable header name parsing!\n");
1357 parse_line_directive();
1364 /* TODO; output the rest of the line */
1365 parse_error("#error directive: ");
1374 * Parse a preprocessor directive.
1376 static void parse_preprocessor_directive(void)
1380 switch (pp_token.type) {
1382 parse_preprocessor_identifier();
1385 parse_line_directive();
1388 /* NULL directive, see §6.10.7 */
1391 parse_error("invalid preprocessor directive");
1392 eat_until_newline();
1397 #define MAYBE_PROLOG \
1402 #define MAYBE(ch, set_type) \
1405 lexer_token.type = set_type; \
1408 /* must use this as last thing */
1409 #define MAYBE_MODE(ch, set_type, mode) \
1411 if (c_mode & mode) { \
1413 lexer_token.type = set_type; \
1418 #define ELSE_CODE(code) \
1422 } /* end of while (true) */ \
1425 #define ELSE(set_type) \
1427 lexer_token.type = set_type; \
1431 void lexer_next_preprocessing_token(void)
1441 lexer_token.type = '\n';
1447 /* might be a wide string ( L"string" ) */
1448 if (lexer_token.symbol == symbol_L) {
1450 case '"': parse_wide_string_literal(); break;
1451 case '\'': parse_wide_character_constant(); break;
1461 parse_string_literal();
1465 parse_character_constant();
1478 MAYBE('.', T_DOTDOTDOT)
1482 lexer_token.type = '.';
1488 MAYBE('&', T_ANDAND)
1489 MAYBE('=', T_ANDEQUAL)
1493 MAYBE('=', T_ASTERISKEQUAL)
1497 MAYBE('+', T_PLUSPLUS)
1498 MAYBE('=', T_PLUSEQUAL)
1502 MAYBE('>', T_MINUSGREATER)
1503 MAYBE('-', T_MINUSMINUS)
1504 MAYBE('=', T_MINUSEQUAL)
1508 MAYBE('=', T_EXCLAMATIONMARKEQUAL)
1512 MAYBE('=', T_SLASHEQUAL)
1515 skip_multiline_comment();
1516 lexer_next_preprocessing_token();
1520 skip_line_comment();
1521 lexer_next_preprocessing_token();
1527 MAYBE('=', T_PERCENTEQUAL)
1532 MAYBE(':', T_HASHHASH)
1536 lexer_token.type = '#';
1545 MAYBE('=', T_LESSEQUAL)
1548 MAYBE('=', T_LESSLESSEQUAL)
1553 MAYBE('=', T_GREATEREQUAL)
1556 MAYBE('=', T_GREATERGREATEREQUAL)
1557 ELSE(T_GREATERGREATER)
1561 MAYBE('=', T_CARETEQUAL)
1565 MAYBE('=', T_PIPEEQUAL)
1566 MAYBE('|', T_PIPEPIPE)
1571 MAYBE_MODE(':', T_COLONCOLON, _CXX)
1575 MAYBE('=', T_EQUALEQUAL)
1579 MAYBE('#', T_HASHHASH)
1593 lexer_token.type = c;
1598 lexer_token.type = T_EOF;
1603 errorf(&lexer_token.source_position, "unknown character '%c' found", c);
1605 lexer_token.type = T_ERROR;
1611 void lexer_next_token(void)
1613 lexer_next_preprocessing_token();
1615 while (lexer_token.type == '\n') {
1617 lexer_next_preprocessing_token();
1620 if (lexer_token.type == '#') {
1621 parse_preprocessor_directive();
1626 void init_lexer(void)
1628 strset_init(&stringset);
1629 symbol_L = symbol_table_insert("L");
1632 void lexer_open_stream(FILE *stream, const char *input_name)
1635 lexer_token.source_position.linenr = 0;
1636 lexer_token.source_position.input_name = input_name;
1641 /* place a virtual \n at the beginning so the lexer knows that we're
1642 * at the beginning of a line */
1646 void lexer_open_buffer(const char *buffer, size_t len, const char *input_name)
1649 lexer_token.source_position.linenr = 0;
1650 lexer_token.source_position.input_name = input_name;
1654 bufend = buffer + len;
1658 panic("builtin lexing not done yet");
1661 /* place a virtual \n at the beginning so the lexer knows that we're
1662 * at the beginning of a line */
1666 void exit_lexer(void)
1668 strset_destroy(&stringset);
1671 static __attribute__((unused))
1672 void dbg_pos(const source_position_t source_position)
1674 fprintf(stdout, "%s:%u\n", source_position.input_name,
1675 source_position.linenr);