Mercurial > hg > CbC > CbC_gcc
annotate libcpp/charset.c @ 120:f93fa5091070
fix conv1.c
| author | mir3636 |
|---|---|
| date | Thu, 08 Mar 2018 14:53:42 +0900 |
| parents | 04ced10e8804 |
| children | 84e7813d76e9 |
| rev | line source |
|---|---|
| 0 | 1 /* CPP Library - charsets |
| 111 | 2 Copyright (C) 1998-2017 Free Software Foundation, Inc. |
| 0 | 3 |
| 4 Broken out of c-lex.c Apr 2003, adding valid C99 UCN ranges. | |
| 5 | |
| 6 This program is free software; you can redistribute it and/or modify it | |
| 7 under the terms of the GNU General Public License as published by the | |
| 8 Free Software Foundation; either version 3, or (at your option) any | |
| 9 later version. | |
| 10 | |
| 11 This program is distributed in the hope that it will be useful, | |
| 12 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 GNU General Public License for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
| 17 along with this program; see the file COPYING3. If not see | |
| 18 <http://www.gnu.org/licenses/>. */ | |
| 19 | |
| 20 #include "config.h" | |
| 21 #include "system.h" | |
| 22 #include "cpplib.h" | |
| 23 #include "internal.h" | |
| 24 | |
| 25 /* Character set handling for C-family languages. | |
| 26 | |
| 27 Terminological note: In what follows, "charset" or "character set" | |
| 28 will be taken to mean both an abstract set of characters and an | |
| 29 encoding for that set. | |
| 30 | |
| 31 The C99 standard discusses two character sets: source and execution. | |
| 32 The source character set is used for internal processing in translation | |
| 33 phases 1 through 4; the execution character set is used thereafter. | |
| 34 Both are required by 5.2.1.2p1 to be multibyte encodings, not wide | |
| 35 character encodings (see 3.7.2, 3.7.3 for the standardese meanings | |
| 36 of these terms). Furthermore, the "basic character set" (listed in | |
| 37 5.2.1p3) is to be encoded in each with values one byte wide, and is | |
| 38 to appear in the initial shift state. | |
| 39 | |
| 40 It is not explicitly mentioned, but there is also a "wide execution | |
| 41 character set" used to encode wide character constants and wide | |
| 42 string literals; this is supposed to be the result of applying the | |
| 43 standard library function mbstowcs() to an equivalent narrow string | |
| 44 (6.4.5p5). However, the behavior of hexadecimal and octal | |
| 45 \-escapes is at odds with this; they are supposed to be translated | |
| 46 directly to wchar_t values (6.4.4.4p5,6). | |
| 47 | |
| 48 The source character set is not necessarily the character set used | |
| 49 to encode physical source files on disk; translation phase 1 converts | |
| 50 from whatever that encoding is to the source character set. | |
| 51 | |
| 52 The presence of universal character names in C99 (6.4.3 et seq.) | |
| 53 forces the source character set to be isomorphic to ISO 10646, | |
| 54 that is, Unicode. There is no such constraint on the execution | |
| 55 character set; note also that the conversion from source to | |
| 56 execution character set does not occur for identifiers (5.1.1.2p1#5). | |
| 57 | |
| 58 For convenience of implementation, the source character set's | |
| 59 encoding of the basic character set should be identical to the | |
| 60 execution character set OF THE HOST SYSTEM's encoding of the basic | |
| 61 character set, and it should not be a state-dependent encoding. | |
| 62 | |
| 63 cpplib uses UTF-8 or UTF-EBCDIC for the source character set, | |
| 64 depending on whether the host is based on ASCII or EBCDIC (see | |
| 65 respectively Unicode section 2.3/ISO10646 Amendment 2, and Unicode | |
| 66 Technical Report #16). With limited exceptions, it relies on the | |
| 67 system library's iconv() primitive to do charset conversion | |
| 68 (specified in SUSv2). */ | |
| 69 | |
| 70 #if !HAVE_ICONV | |
| 71 /* Make certain that the uses of iconv(), iconv_open(), iconv_close() | |
| 72 below, which are guarded only by if statements with compile-time | |
| 73 constant conditions, do not cause link errors. */ | |
| 74 #define iconv_open(x, y) (errno = EINVAL, (iconv_t)-1) | |
| 75 #define iconv(a,b,c,d,e) (errno = EINVAL, (size_t)-1) | |
| 76 #define iconv_close(x) (void)0 | |
| 77 #define ICONV_CONST | |
| 78 #endif | |
| 79 | |
| 80 #if HOST_CHARSET == HOST_CHARSET_ASCII | |
| 81 #define SOURCE_CHARSET "UTF-8" | |
| 82 #define LAST_POSSIBLY_BASIC_SOURCE_CHAR 0x7e | |
| 83 #elif HOST_CHARSET == HOST_CHARSET_EBCDIC | |
| 84 #define SOURCE_CHARSET "UTF-EBCDIC" | |
| 85 #define LAST_POSSIBLY_BASIC_SOURCE_CHAR 0xFF | |
| 86 #else | |
| 87 #error "Unrecognized basic host character set" | |
| 88 #endif | |
| 89 | |
| 90 #ifndef EILSEQ | |
| 91 #define EILSEQ EINVAL | |
| 92 #endif | |
| 93 | |
| 94 /* This structure is used for a resizable string buffer throughout. */ | |
| 95 /* Don't call it strbuf, as that conflicts with unistd.h on systems | |
| 96 such as DYNIX/ptx where unistd.h includes stropts.h. */ | |
| 97 struct _cpp_strbuf | |
| 98 { | |
| 99 uchar *text; | |
| 100 size_t asize; | |
| 101 size_t len; | |
| 102 }; | |
| 103 | |
| 104 /* This is enough to hold any string that fits on a single 80-column | |
| 105 line, even if iconv quadruples its size (e.g. conversion from | |
| 106 ASCII to UTF-32) rounded up to a power of two. */ | |
| 107 #define OUTBUF_BLOCK_SIZE 256 | |
| 108 | |
| 109 /* Conversions between UTF-8 and UTF-16/32 are implemented by custom | |
| 110 logic. This is because a depressing number of systems lack iconv, | |
| 111 or have have iconv libraries that do not do these conversions, so | |
| 112 we need a fallback implementation for them. To ensure the fallback | |
| 113 doesn't break due to neglect, it is used on all systems. | |
| 114 | |
| 115 UTF-32 encoding is nice and simple: a four-byte binary number, | |
| 116 constrained to the range 00000000-7FFFFFFF to avoid questions of | |
| 117 signedness. We do have to cope with big- and little-endian | |
| 118 variants. | |
| 119 | |
| 120 UTF-16 encoding uses two-byte binary numbers, again in big- and | |
| 121 little-endian variants, for all values in the 00000000-0000FFFF | |
| 122 range. Values in the 00010000-0010FFFF range are encoded as pairs | |
| 123 of two-byte numbers, called "surrogate pairs": given a number S in | |
| 124 this range, it is mapped to a pair (H, L) as follows: | |
| 125 | |
| 126 H = (S - 0x10000) / 0x400 + 0xD800 | |
| 127 L = (S - 0x10000) % 0x400 + 0xDC00 | |
| 128 | |
| 129 Two-byte values in the D800...DFFF range are ill-formed except as a | |
| 130 component of a surrogate pair. Even if the encoding within a | |
| 131 two-byte value is little-endian, the H member of the surrogate pair | |
| 132 comes first. | |
| 133 | |
| 134 There is no way to encode values in the 00110000-7FFFFFFF range, | |
| 135 which is not currently a problem as there are no assigned code | |
| 136 points in that range; however, the author expects that it will | |
| 137 eventually become necessary to abandon UTF-16 due to this | |
| 138 limitation. Note also that, because of these pairs, UTF-16 does | |
| 139 not meet the requirements of the C standard for a wide character | |
| 140 encoding (see 3.7.3 and 6.4.4.4p11). | |
| 141 | |
| 142 UTF-8 encoding looks like this: | |
| 143 | |
| 144 value range encoded as | |
| 145 00000000-0000007F 0xxxxxxx | |
| 146 00000080-000007FF 110xxxxx 10xxxxxx | |
| 147 00000800-0000FFFF 1110xxxx 10xxxxxx 10xxxxxx | |
| 148 00010000-001FFFFF 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx | |
| 149 00200000-03FFFFFF 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx | |
| 150 04000000-7FFFFFFF 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx | |
| 151 | |
| 152 Values in the 0000D800 ... 0000DFFF range (surrogates) are invalid, | |
| 153 which means that three-byte sequences ED xx yy, with A0 <= xx <= BF, | |
| 154 never occur. Note also that any value that can be encoded by a | |
| 155 given row of the table can also be encoded by all successive rows, | |
| 156 but this is not done; only the shortest possible encoding for any | |
| 157 given value is valid. For instance, the character 07C0 could be | |
| 158 encoded as any of DF 80, E0 9F 80, F0 80 9F 80, F8 80 80 9F 80, or | |
| 159 FC 80 80 80 9F 80. Only the first is valid. | |
| 160 | |
| 161 An implementation note: the transformation from UTF-16 to UTF-8, or | |
| 162 vice versa, is easiest done by using UTF-32 as an intermediary. */ | |
| 163 | |
| 164 /* Internal primitives which go from an UTF-8 byte stream to native-endian | |
| 165 UTF-32 in a cppchar_t, or vice versa; this avoids an extra marshal/unmarshal | |
| 166 operation in several places below. */ | |
| 167 static inline int | |
| 168 one_utf8_to_cppchar (const uchar **inbufp, size_t *inbytesleftp, | |
| 169 cppchar_t *cp) | |
| 170 { | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
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changeset
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171 static const uchar masks[6] = { 0x7F, 0x1F, 0x0F, 0x07, 0x03, 0x01 }; |
| 0 | 172 static const uchar patns[6] = { 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC }; |
| 173 | |
| 174 cppchar_t c; | |
| 175 const uchar *inbuf = *inbufp; | |
| 176 size_t nbytes, i; | |
| 177 | |
| 178 if (*inbytesleftp < 1) | |
| 179 return EINVAL; | |
| 180 | |
| 181 c = *inbuf; | |
| 182 if (c < 0x80) | |
| 183 { | |
| 184 *cp = c; | |
| 185 *inbytesleftp -= 1; | |
| 186 *inbufp += 1; | |
| 187 return 0; | |
| 188 } | |
| 189 | |
| 190 /* The number of leading 1-bits in the first byte indicates how many | |
| 191 bytes follow. */ | |
| 192 for (nbytes = 2; nbytes < 7; nbytes++) | |
| 193 if ((c & ~masks[nbytes-1]) == patns[nbytes-1]) | |
| 194 goto found; | |
| 195 return EILSEQ; | |
| 196 found: | |
| 197 | |
| 198 if (*inbytesleftp < nbytes) | |
| 199 return EINVAL; | |
| 200 | |
| 201 c = (c & masks[nbytes-1]); | |
| 202 inbuf++; | |
| 203 for (i = 1; i < nbytes; i++) | |
| 204 { | |
| 205 cppchar_t n = *inbuf++; | |
| 206 if ((n & 0xC0) != 0x80) | |
| 207 return EILSEQ; | |
| 208 c = ((c << 6) + (n & 0x3F)); | |
| 209 } | |
| 210 | |
| 211 /* Make sure the shortest possible encoding was used. */ | |
| 212 if (c <= 0x7F && nbytes > 1) return EILSEQ; | |
| 213 if (c <= 0x7FF && nbytes > 2) return EILSEQ; | |
| 214 if (c <= 0xFFFF && nbytes > 3) return EILSEQ; | |
| 215 if (c <= 0x1FFFFF && nbytes > 4) return EILSEQ; | |
| 216 if (c <= 0x3FFFFFF && nbytes > 5) return EILSEQ; | |
| 217 | |
| 218 /* Make sure the character is valid. */ | |
| 219 if (c > 0x7FFFFFFF || (c >= 0xD800 && c <= 0xDFFF)) return EILSEQ; | |
| 220 | |
| 221 *cp = c; | |
| 222 *inbufp = inbuf; | |
| 223 *inbytesleftp -= nbytes; | |
| 224 return 0; | |
| 225 } | |
| 226 | |
| 227 static inline int | |
| 228 one_cppchar_to_utf8 (cppchar_t c, uchar **outbufp, size_t *outbytesleftp) | |
| 229 { | |
| 230 static const uchar masks[6] = { 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC }; | |
| 231 static const uchar limits[6] = { 0x80, 0xE0, 0xF0, 0xF8, 0xFC, 0xFE }; | |
| 232 size_t nbytes; | |
| 233 uchar buf[6], *p = &buf[6]; | |
| 234 uchar *outbuf = *outbufp; | |
| 235 | |
| 236 nbytes = 1; | |
| 237 if (c < 0x80) | |
| 238 *--p = c; | |
| 239 else | |
| 240 { | |
| 241 do | |
| 242 { | |
| 243 *--p = ((c & 0x3F) | 0x80); | |
| 244 c >>= 6; | |
| 245 nbytes++; | |
| 246 } | |
| 247 while (c >= 0x3F || (c & limits[nbytes-1])); | |
| 248 *--p = (c | masks[nbytes-1]); | |
| 249 } | |
| 250 | |
| 251 if (*outbytesleftp < nbytes) | |
| 252 return E2BIG; | |
| 253 | |
| 254 while (p < &buf[6]) | |
| 255 *outbuf++ = *p++; | |
| 256 *outbytesleftp -= nbytes; | |
| 257 *outbufp = outbuf; | |
| 258 return 0; | |
| 259 } | |
| 260 | |
| 261 /* The following four functions transform one character between the two | |
| 262 encodings named in the function name. All have the signature | |
| 263 int (*)(iconv_t bigend, const uchar **inbufp, size_t *inbytesleftp, | |
| 264 uchar **outbufp, size_t *outbytesleftp) | |
| 265 | |
| 266 BIGEND must have the value 0 or 1, coerced to (iconv_t); it is | |
| 267 interpreted as a boolean indicating whether big-endian or | |
| 268 little-endian encoding is to be used for the member of the pair | |
| 269 that is not UTF-8. | |
| 270 | |
| 271 INBUFP, INBYTESLEFTP, OUTBUFP, OUTBYTESLEFTP work exactly as they | |
| 272 do for iconv. | |
| 273 | |
| 274 The return value is either 0 for success, or an errno value for | |
| 275 failure, which may be E2BIG (need more space), EILSEQ (ill-formed | |
| 276 input sequence), ir EINVAL (incomplete input sequence). */ | |
| 277 | |
| 278 static inline int | |
| 279 one_utf8_to_utf32 (iconv_t bigend, const uchar **inbufp, size_t *inbytesleftp, | |
| 280 uchar **outbufp, size_t *outbytesleftp) | |
| 281 { | |
| 282 uchar *outbuf; | |
| 283 cppchar_t s = 0; | |
| 284 int rval; | |
| 285 | |
| 286 /* Check for space first, since we know exactly how much we need. */ | |
| 287 if (*outbytesleftp < 4) | |
| 288 return E2BIG; | |
| 289 | |
| 290 rval = one_utf8_to_cppchar (inbufp, inbytesleftp, &s); | |
| 291 if (rval) | |
| 292 return rval; | |
| 293 | |
| 294 outbuf = *outbufp; | |
| 295 outbuf[bigend ? 3 : 0] = (s & 0x000000FF); | |
| 296 outbuf[bigend ? 2 : 1] = (s & 0x0000FF00) >> 8; | |
| 297 outbuf[bigend ? 1 : 2] = (s & 0x00FF0000) >> 16; | |
| 298 outbuf[bigend ? 0 : 3] = (s & 0xFF000000) >> 24; | |
| 299 | |
| 300 *outbufp += 4; | |
| 301 *outbytesleftp -= 4; | |
| 302 return 0; | |
| 303 } | |
| 304 | |
| 305 static inline int | |
| 306 one_utf32_to_utf8 (iconv_t bigend, const uchar **inbufp, size_t *inbytesleftp, | |
| 307 uchar **outbufp, size_t *outbytesleftp) | |
| 308 { | |
| 309 cppchar_t s; | |
| 310 int rval; | |
| 311 const uchar *inbuf; | |
| 312 | |
| 313 if (*inbytesleftp < 4) | |
| 314 return EINVAL; | |
| 315 | |
| 316 inbuf = *inbufp; | |
| 317 | |
| 318 s = inbuf[bigend ? 0 : 3] << 24; | |
| 319 s += inbuf[bigend ? 1 : 2] << 16; | |
| 320 s += inbuf[bigend ? 2 : 1] << 8; | |
| 321 s += inbuf[bigend ? 3 : 0]; | |
| 322 | |
| 323 if (s >= 0x7FFFFFFF || (s >= 0xD800 && s <= 0xDFFF)) | |
| 324 return EILSEQ; | |
| 325 | |
| 326 rval = one_cppchar_to_utf8 (s, outbufp, outbytesleftp); | |
| 327 if (rval) | |
| 328 return rval; | |
| 329 | |
| 330 *inbufp += 4; | |
| 331 *inbytesleftp -= 4; | |
| 332 return 0; | |
| 333 } | |
| 334 | |
| 335 static inline int | |
| 336 one_utf8_to_utf16 (iconv_t bigend, const uchar **inbufp, size_t *inbytesleftp, | |
| 337 uchar **outbufp, size_t *outbytesleftp) | |
| 338 { | |
| 339 int rval; | |
| 340 cppchar_t s = 0; | |
| 341 const uchar *save_inbuf = *inbufp; | |
| 342 size_t save_inbytesleft = *inbytesleftp; | |
| 343 uchar *outbuf = *outbufp; | |
| 344 | |
| 345 rval = one_utf8_to_cppchar (inbufp, inbytesleftp, &s); | |
| 346 if (rval) | |
| 347 return rval; | |
| 348 | |
| 349 if (s > 0x0010FFFF) | |
| 350 { | |
| 351 *inbufp = save_inbuf; | |
| 352 *inbytesleftp = save_inbytesleft; | |
| 353 return EILSEQ; | |
| 354 } | |
| 355 | |
| 111 | 356 if (s <= 0xFFFF) |
| 0 | 357 { |
| 358 if (*outbytesleftp < 2) | |
| 359 { | |
| 360 *inbufp = save_inbuf; | |
| 361 *inbytesleftp = save_inbytesleft; | |
| 362 return E2BIG; | |
| 363 } | |
| 364 outbuf[bigend ? 1 : 0] = (s & 0x00FF); | |
| 365 outbuf[bigend ? 0 : 1] = (s & 0xFF00) >> 8; | |
| 366 | |
| 367 *outbufp += 2; | |
| 368 *outbytesleftp -= 2; | |
| 369 return 0; | |
| 370 } | |
| 371 else | |
| 372 { | |
| 373 cppchar_t hi, lo; | |
| 374 | |
| 375 if (*outbytesleftp < 4) | |
| 376 { | |
| 377 *inbufp = save_inbuf; | |
| 378 *inbytesleftp = save_inbytesleft; | |
| 379 return E2BIG; | |
| 380 } | |
| 381 | |
| 382 hi = (s - 0x10000) / 0x400 + 0xD800; | |
| 383 lo = (s - 0x10000) % 0x400 + 0xDC00; | |
| 384 | |
| 385 /* Even if we are little-endian, put the high surrogate first. | |
| 386 ??? Matches practice? */ | |
| 387 outbuf[bigend ? 1 : 0] = (hi & 0x00FF); | |
| 388 outbuf[bigend ? 0 : 1] = (hi & 0xFF00) >> 8; | |
| 389 outbuf[bigend ? 3 : 2] = (lo & 0x00FF); | |
| 390 outbuf[bigend ? 2 : 3] = (lo & 0xFF00) >> 8; | |
| 391 | |
| 392 *outbufp += 4; | |
| 393 *outbytesleftp -= 4; | |
| 394 return 0; | |
| 395 } | |
| 396 } | |
| 397 | |
| 398 static inline int | |
| 399 one_utf16_to_utf8 (iconv_t bigend, const uchar **inbufp, size_t *inbytesleftp, | |
| 400 uchar **outbufp, size_t *outbytesleftp) | |
| 401 { | |
| 402 cppchar_t s; | |
| 403 const uchar *inbuf = *inbufp; | |
| 404 int rval; | |
| 405 | |
| 406 if (*inbytesleftp < 2) | |
| 407 return EINVAL; | |
| 408 s = inbuf[bigend ? 0 : 1] << 8; | |
| 409 s += inbuf[bigend ? 1 : 0]; | |
| 410 | |
| 411 /* Low surrogate without immediately preceding high surrogate is invalid. */ | |
| 412 if (s >= 0xDC00 && s <= 0xDFFF) | |
| 413 return EILSEQ; | |
| 414 /* High surrogate must have a following low surrogate. */ | |
| 415 else if (s >= 0xD800 && s <= 0xDBFF) | |
| 416 { | |
| 417 cppchar_t hi = s, lo; | |
| 418 if (*inbytesleftp < 4) | |
| 419 return EINVAL; | |
| 420 | |
| 421 lo = inbuf[bigend ? 2 : 3] << 8; | |
| 422 lo += inbuf[bigend ? 3 : 2]; | |
| 423 | |
| 424 if (lo < 0xDC00 || lo > 0xDFFF) | |
| 425 return EILSEQ; | |
| 426 | |
| 427 s = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000; | |
| 428 } | |
| 429 | |
| 430 rval = one_cppchar_to_utf8 (s, outbufp, outbytesleftp); | |
| 431 if (rval) | |
| 432 return rval; | |
| 433 | |
| 434 /* Success - update the input pointers (one_cppchar_to_utf8 has done | |
| 435 the output pointers for us). */ | |
| 436 if (s <= 0xFFFF) | |
| 437 { | |
| 438 *inbufp += 2; | |
| 439 *inbytesleftp -= 2; | |
| 440 } | |
| 441 else | |
| 442 { | |
| 443 *inbufp += 4; | |
| 444 *inbytesleftp -= 4; | |
| 445 } | |
| 446 return 0; | |
| 447 } | |
| 448 | |
| 449 /* Helper routine for the next few functions. The 'const' on | |
| 450 one_conversion means that we promise not to modify what function is | |
| 451 pointed to, which lets the inliner see through it. */ | |
| 452 | |
| 453 static inline bool | |
| 454 conversion_loop (int (*const one_conversion)(iconv_t, const uchar **, size_t *, | |
| 455 uchar **, size_t *), | |
| 456 iconv_t cd, const uchar *from, size_t flen, struct _cpp_strbuf *to) | |
| 457 { | |
| 458 const uchar *inbuf; | |
| 459 uchar *outbuf; | |
| 460 size_t inbytesleft, outbytesleft; | |
| 461 int rval; | |
| 462 | |
| 463 inbuf = from; | |
| 464 inbytesleft = flen; | |
| 465 outbuf = to->text + to->len; | |
| 466 outbytesleft = to->asize - to->len; | |
| 467 | |
| 468 for (;;) | |
| 469 { | |
| 470 do | |
| 471 rval = one_conversion (cd, &inbuf, &inbytesleft, | |
| 472 &outbuf, &outbytesleft); | |
| 473 while (inbytesleft && !rval); | |
| 474 | |
| 475 if (__builtin_expect (inbytesleft == 0, 1)) | |
| 476 { | |
| 477 to->len = to->asize - outbytesleft; | |
| 478 return true; | |
| 479 } | |
| 480 if (rval != E2BIG) | |
| 481 { | |
| 482 errno = rval; | |
| 483 return false; | |
| 484 } | |
| 485 | |
| 486 outbytesleft += OUTBUF_BLOCK_SIZE; | |
| 487 to->asize += OUTBUF_BLOCK_SIZE; | |
| 488 to->text = XRESIZEVEC (uchar, to->text, to->asize); | |
| 489 outbuf = to->text + to->asize - outbytesleft; | |
| 490 } | |
| 491 } | |
| 492 | |
| 493 | |
| 494 /* These functions convert entire strings between character sets. | |
| 495 They all have the signature | |
| 496 | |
| 497 bool (*)(iconv_t cd, const uchar *from, size_t flen, struct _cpp_strbuf *to); | |
| 498 | |
| 499 The input string FROM is converted as specified by the function | |
| 500 name plus the iconv descriptor CD (which may be fake), and the | |
| 501 result appended to TO. On any error, false is returned, otherwise true. */ | |
| 502 | |
| 503 /* These four use the custom conversion code above. */ | |
| 504 static bool | |
| 505 convert_utf8_utf16 (iconv_t cd, const uchar *from, size_t flen, | |
| 506 struct _cpp_strbuf *to) | |
| 507 { | |
| 508 return conversion_loop (one_utf8_to_utf16, cd, from, flen, to); | |
| 509 } | |
| 510 | |
| 511 static bool | |
| 512 convert_utf8_utf32 (iconv_t cd, const uchar *from, size_t flen, | |
| 513 struct _cpp_strbuf *to) | |
| 514 { | |
| 515 return conversion_loop (one_utf8_to_utf32, cd, from, flen, to); | |
| 516 } | |
| 517 | |
| 518 static bool | |
| 519 convert_utf16_utf8 (iconv_t cd, const uchar *from, size_t flen, | |
| 520 struct _cpp_strbuf *to) | |
| 521 { | |
| 522 return conversion_loop (one_utf16_to_utf8, cd, from, flen, to); | |
| 523 } | |
| 524 | |
| 525 static bool | |
| 526 convert_utf32_utf8 (iconv_t cd, const uchar *from, size_t flen, | |
| 527 struct _cpp_strbuf *to) | |
| 528 { | |
| 529 return conversion_loop (one_utf32_to_utf8, cd, from, flen, to); | |
| 530 } | |
| 531 | |
| 532 /* Identity conversion, used when we have no alternative. */ | |
| 533 static bool | |
| 534 convert_no_conversion (iconv_t cd ATTRIBUTE_UNUSED, | |
| 535 const uchar *from, size_t flen, struct _cpp_strbuf *to) | |
| 536 { | |
| 537 if (to->len + flen > to->asize) | |
| 538 { | |
| 539 to->asize = to->len + flen; | |
| 111 | 540 to->asize += to->asize / 4; |
| 0 | 541 to->text = XRESIZEVEC (uchar, to->text, to->asize); |
| 542 } | |
| 543 memcpy (to->text + to->len, from, flen); | |
| 544 to->len += flen; | |
| 545 return true; | |
| 546 } | |
| 547 | |
| 548 /* And this one uses the system iconv primitive. It's a little | |
| 549 different, since iconv's interface is a little different. */ | |
| 550 #if HAVE_ICONV | |
| 551 | |
| 552 #define CONVERT_ICONV_GROW_BUFFER \ | |
| 553 do { \ | |
| 554 outbytesleft += OUTBUF_BLOCK_SIZE; \ | |
| 555 to->asize += OUTBUF_BLOCK_SIZE; \ | |
| 556 to->text = XRESIZEVEC (uchar, to->text, to->asize); \ | |
| 557 outbuf = (char *)to->text + to->asize - outbytesleft; \ | |
| 558 } while (0) | |
| 559 | |
| 560 static bool | |
| 561 convert_using_iconv (iconv_t cd, const uchar *from, size_t flen, | |
| 562 struct _cpp_strbuf *to) | |
| 563 { | |
| 564 ICONV_CONST char *inbuf; | |
| 565 char *outbuf; | |
| 566 size_t inbytesleft, outbytesleft; | |
| 567 | |
| 568 /* Reset conversion descriptor and check that it is valid. */ | |
| 569 if (iconv (cd, 0, 0, 0, 0) == (size_t)-1) | |
| 570 return false; | |
| 571 | |
| 572 inbuf = (ICONV_CONST char *)from; | |
| 573 inbytesleft = flen; | |
| 574 outbuf = (char *)to->text + to->len; | |
| 575 outbytesleft = to->asize - to->len; | |
| 576 | |
| 577 for (;;) | |
| 578 { | |
| 579 iconv (cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft); | |
| 580 if (__builtin_expect (inbytesleft == 0, 1)) | |
| 581 { | |
| 582 /* Close out any shift states, returning to the initial state. */ | |
| 583 if (iconv (cd, 0, 0, &outbuf, &outbytesleft) == (size_t)-1) | |
| 584 { | |
| 585 if (errno != E2BIG) | |
| 586 return false; | |
| 587 | |
| 588 CONVERT_ICONV_GROW_BUFFER; | |
| 589 if (iconv (cd, 0, 0, &outbuf, &outbytesleft) == (size_t)-1) | |
| 590 return false; | |
| 591 } | |
| 592 | |
| 593 to->len = to->asize - outbytesleft; | |
| 594 return true; | |
| 595 } | |
| 596 if (errno != E2BIG) | |
| 597 return false; | |
| 598 | |
| 599 CONVERT_ICONV_GROW_BUFFER; | |
| 600 } | |
| 601 } | |
| 602 #else | |
| 603 #define convert_using_iconv 0 /* prevent undefined symbol error below */ | |
| 604 #endif | |
| 605 | |
| 606 /* Arrange for the above custom conversion logic to be used automatically | |
| 607 when conversion between a suitable pair of character sets is requested. */ | |
| 608 | |
| 609 #define APPLY_CONVERSION(CONVERTER, FROM, FLEN, TO) \ | |
| 610 CONVERTER.func (CONVERTER.cd, FROM, FLEN, TO) | |
| 611 | |
| 111 | 612 struct cpp_conversion |
| 0 | 613 { |
| 614 const char *pair; | |
| 615 convert_f func; | |
| 616 iconv_t fake_cd; | |
| 617 }; | |
| 111 | 618 static const struct cpp_conversion conversion_tab[] = { |
| 0 | 619 { "UTF-8/UTF-32LE", convert_utf8_utf32, (iconv_t)0 }, |
| 620 { "UTF-8/UTF-32BE", convert_utf8_utf32, (iconv_t)1 }, | |
| 621 { "UTF-8/UTF-16LE", convert_utf8_utf16, (iconv_t)0 }, | |
| 622 { "UTF-8/UTF-16BE", convert_utf8_utf16, (iconv_t)1 }, | |
| 623 { "UTF-32LE/UTF-8", convert_utf32_utf8, (iconv_t)0 }, | |
| 624 { "UTF-32BE/UTF-8", convert_utf32_utf8, (iconv_t)1 }, | |
| 625 { "UTF-16LE/UTF-8", convert_utf16_utf8, (iconv_t)0 }, | |
| 626 { "UTF-16BE/UTF-8", convert_utf16_utf8, (iconv_t)1 }, | |
| 627 }; | |
| 628 | |
| 629 /* Subroutine of cpp_init_iconv: initialize and return a | |
| 630 cset_converter structure for conversion from FROM to TO. If | |
| 631 iconv_open() fails, issue an error and return an identity | |
| 632 converter. Silently return an identity converter if FROM and TO | |
| 633 are identical. */ | |
| 634 static struct cset_converter | |
| 635 init_iconv_desc (cpp_reader *pfile, const char *to, const char *from) | |
| 636 { | |
| 637 struct cset_converter ret; | |
| 638 char *pair; | |
| 639 size_t i; | |
| 640 | |
| 641 if (!strcasecmp (to, from)) | |
| 642 { | |
| 643 ret.func = convert_no_conversion; | |
| 644 ret.cd = (iconv_t) -1; | |
| 645 ret.width = -1; | |
| 646 return ret; | |
| 647 } | |
| 648 | |
| 649 pair = (char *) alloca(strlen(to) + strlen(from) + 2); | |
| 650 | |
| 651 strcpy(pair, from); | |
| 652 strcat(pair, "/"); | |
| 653 strcat(pair, to); | |
| 654 for (i = 0; i < ARRAY_SIZE (conversion_tab); i++) | |
| 655 if (!strcasecmp (pair, conversion_tab[i].pair)) | |
| 656 { | |
| 657 ret.func = conversion_tab[i].func; | |
| 658 ret.cd = conversion_tab[i].fake_cd; | |
| 659 ret.width = -1; | |
| 660 return ret; | |
| 661 } | |
| 662 | |
| 663 /* No custom converter - try iconv. */ | |
| 664 if (HAVE_ICONV) | |
| 665 { | |
| 666 ret.func = convert_using_iconv; | |
| 667 ret.cd = iconv_open (to, from); | |
| 668 ret.width = -1; | |
| 669 | |
| 670 if (ret.cd == (iconv_t) -1) | |
| 671 { | |
| 672 if (errno == EINVAL) | |
| 673 cpp_error (pfile, CPP_DL_ERROR, /* FIXME should be DL_SORRY */ | |
| 674 "conversion from %s to %s not supported by iconv", | |
| 675 from, to); | |
| 676 else | |
| 677 cpp_errno (pfile, CPP_DL_ERROR, "iconv_open"); | |
| 678 | |
| 679 ret.func = convert_no_conversion; | |
| 680 } | |
| 681 } | |
| 682 else | |
| 683 { | |
| 684 cpp_error (pfile, CPP_DL_ERROR, /* FIXME: should be DL_SORRY */ | |
| 685 "no iconv implementation, cannot convert from %s to %s", | |
| 686 from, to); | |
| 687 ret.func = convert_no_conversion; | |
| 688 ret.cd = (iconv_t) -1; | |
| 689 ret.width = -1; | |
| 690 } | |
| 691 return ret; | |
| 692 } | |
| 693 | |
| 694 /* If charset conversion is requested, initialize iconv(3) descriptors | |
| 695 for conversion from the source character set to the execution | |
| 696 character sets. If iconv is not present in the C library, and | |
| 697 conversion is requested, issue an error. */ | |
| 698 | |
| 699 void | |
| 700 cpp_init_iconv (cpp_reader *pfile) | |
| 701 { | |
| 702 const char *ncset = CPP_OPTION (pfile, narrow_charset); | |
| 703 const char *wcset = CPP_OPTION (pfile, wide_charset); | |
| 704 const char *default_wcset; | |
| 705 | |
| 706 bool be = CPP_OPTION (pfile, bytes_big_endian); | |
| 707 | |
| 708 if (CPP_OPTION (pfile, wchar_precision) >= 32) | |
| 709 default_wcset = be ? "UTF-32BE" : "UTF-32LE"; | |
| 710 else if (CPP_OPTION (pfile, wchar_precision) >= 16) | |
| 711 default_wcset = be ? "UTF-16BE" : "UTF-16LE"; | |
| 712 else | |
| 713 /* This effectively means that wide strings are not supported, | |
| 714 so don't do any conversion at all. */ | |
| 715 default_wcset = SOURCE_CHARSET; | |
| 716 | |
| 717 if (!ncset) | |
| 718 ncset = SOURCE_CHARSET; | |
| 719 if (!wcset) | |
| 720 wcset = default_wcset; | |
| 721 | |
| 722 pfile->narrow_cset_desc = init_iconv_desc (pfile, ncset, SOURCE_CHARSET); | |
| 723 pfile->narrow_cset_desc.width = CPP_OPTION (pfile, char_precision); | |
|
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724 pfile->utf8_cset_desc = init_iconv_desc (pfile, "UTF-8", SOURCE_CHARSET); |
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725 pfile->utf8_cset_desc.width = CPP_OPTION (pfile, char_precision); |
| 0 | 726 pfile->char16_cset_desc = init_iconv_desc (pfile, |
| 727 be ? "UTF-16BE" : "UTF-16LE", | |
| 728 SOURCE_CHARSET); | |
| 729 pfile->char16_cset_desc.width = 16; | |
| 730 pfile->char32_cset_desc = init_iconv_desc (pfile, | |
| 731 be ? "UTF-32BE" : "UTF-32LE", | |
| 732 SOURCE_CHARSET); | |
| 733 pfile->char32_cset_desc.width = 32; | |
| 734 pfile->wide_cset_desc = init_iconv_desc (pfile, wcset, SOURCE_CHARSET); | |
| 735 pfile->wide_cset_desc.width = CPP_OPTION (pfile, wchar_precision); | |
| 736 } | |
| 737 | |
| 738 /* Destroy iconv(3) descriptors set up by cpp_init_iconv, if necessary. */ | |
| 739 void | |
| 740 _cpp_destroy_iconv (cpp_reader *pfile) | |
| 741 { | |
| 742 if (HAVE_ICONV) | |
| 743 { | |
| 744 if (pfile->narrow_cset_desc.func == convert_using_iconv) | |
| 745 iconv_close (pfile->narrow_cset_desc.cd); | |
|
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746 if (pfile->utf8_cset_desc.func == convert_using_iconv) |
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747 iconv_close (pfile->utf8_cset_desc.cd); |
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748 if (pfile->char16_cset_desc.func == convert_using_iconv) |
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749 iconv_close (pfile->char16_cset_desc.cd); |
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750 if (pfile->char32_cset_desc.func == convert_using_iconv) |
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751 iconv_close (pfile->char32_cset_desc.cd); |
| 0 | 752 if (pfile->wide_cset_desc.func == convert_using_iconv) |
| 753 iconv_close (pfile->wide_cset_desc.cd); | |
| 754 } | |
| 755 } | |
| 756 | |
| 757 /* Utility routine for use by a full compiler. C is a character taken | |
| 758 from the *basic* source character set, encoded in the host's | |
| 759 execution encoding. Convert it to (the target's) execution | |
| 760 encoding, and return that value. | |
| 761 | |
| 762 Issues an internal error if C's representation in the narrow | |
| 763 execution character set fails to be a single-byte value (C99 | |
| 764 5.2.1p3: "The representation of each member of the source and | |
| 765 execution character sets shall fit in a byte.") May also issue an | |
| 766 internal error if C fails to be a member of the basic source | |
| 767 character set (testing this exactly is too hard, especially when | |
| 768 the host character set is EBCDIC). */ | |
| 769 cppchar_t | |
| 770 cpp_host_to_exec_charset (cpp_reader *pfile, cppchar_t c) | |
| 771 { | |
| 772 uchar sbuf[1]; | |
| 773 struct _cpp_strbuf tbuf; | |
| 774 | |
| 775 /* This test is merely an approximation, but it suffices to catch | |
| 776 the most important thing, which is that we don't get handed a | |
| 777 character outside the unibyte range of the host character set. */ | |
| 778 if (c > LAST_POSSIBLY_BASIC_SOURCE_CHAR) | |
| 779 { | |
| 780 cpp_error (pfile, CPP_DL_ICE, | |
| 781 "character 0x%lx is not in the basic source character set\n", | |
| 782 (unsigned long)c); | |
| 783 return 0; | |
| 784 } | |
| 785 | |
| 786 /* Being a character in the unibyte range of the host character set, | |
| 787 we can safely splat it into a one-byte buffer and trust that that | |
| 788 is a well-formed string. */ | |
| 789 sbuf[0] = c; | |
| 790 | |
| 791 /* This should never need to reallocate, but just in case... */ | |
| 792 tbuf.asize = 1; | |
| 793 tbuf.text = XNEWVEC (uchar, tbuf.asize); | |
| 794 tbuf.len = 0; | |
| 795 | |
| 796 if (!APPLY_CONVERSION (pfile->narrow_cset_desc, sbuf, 1, &tbuf)) | |
| 797 { | |
| 798 cpp_errno (pfile, CPP_DL_ICE, "converting to execution character set"); | |
| 799 return 0; | |
| 800 } | |
| 801 if (tbuf.len != 1) | |
| 802 { | |
| 803 cpp_error (pfile, CPP_DL_ICE, | |
| 804 "character 0x%lx is not unibyte in execution character set", | |
| 805 (unsigned long)c); | |
| 806 return 0; | |
| 807 } | |
| 808 c = tbuf.text[0]; | |
| 809 free(tbuf.text); | |
| 810 return c; | |
| 811 } | |
| 812 | |
| 813 | |
| 814 | |
| 111 | 815 /* cpp_substring_ranges's constructor. */ |
| 816 | |
| 817 cpp_substring_ranges::cpp_substring_ranges () : | |
| 818 m_ranges (NULL), | |
| 819 m_num_ranges (0), | |
| 820 m_alloc_ranges (8) | |
| 821 { | |
| 822 m_ranges = XNEWVEC (source_range, m_alloc_ranges); | |
| 823 } | |
| 824 | |
| 825 /* cpp_substring_ranges's destructor. */ | |
| 826 | |
| 827 cpp_substring_ranges::~cpp_substring_ranges () | |
| 828 { | |
| 829 free (m_ranges); | |
| 830 } | |
| 831 | |
| 832 /* Add RANGE to the vector of source_range information. */ | |
| 833 | |
| 834 void | |
| 835 cpp_substring_ranges::add_range (source_range range) | |
| 836 { | |
| 837 if (m_num_ranges >= m_alloc_ranges) | |
| 838 { | |
| 839 m_alloc_ranges *= 2; | |
| 840 m_ranges | |
| 841 = (source_range *)xrealloc (m_ranges, | |
| 842 sizeof (source_range) * m_alloc_ranges); | |
| 843 } | |
| 844 m_ranges[m_num_ranges++] = range; | |
| 845 } | |
| 846 | |
| 847 /* Read NUM ranges from LOC_READER, adding them to the vector of source_range | |
| 848 information. */ | |
| 849 | |
| 850 void | |
| 851 cpp_substring_ranges::add_n_ranges (int num, | |
| 852 cpp_string_location_reader &loc_reader) | |
| 853 { | |
| 854 for (int i = 0; i < num; i++) | |
| 855 add_range (loc_reader.get_next ()); | |
| 856 } | |
| 857 | |
| 858 | |
| 859 | |
| 0 | 860 /* Utility routine that computes a mask of the form 0000...111... with |
| 861 WIDTH 1-bits. */ | |
| 862 static inline size_t | |
| 863 width_to_mask (size_t width) | |
| 864 { | |
| 865 width = MIN (width, BITS_PER_CPPCHAR_T); | |
| 866 if (width >= CHAR_BIT * sizeof (size_t)) | |
| 867 return ~(size_t) 0; | |
| 868 else | |
| 869 return ((size_t) 1 << width) - 1; | |
| 870 } | |
| 871 | |
| 872 /* A large table of unicode character information. */ | |
| 873 enum { | |
| 874 /* Valid in a C99 identifier? */ | |
| 875 C99 = 1, | |
| 876 /* Valid in a C99 identifier, but not as the first character? */ | |
| 111 | 877 N99 = 2, |
| 0 | 878 /* Valid in a C++ identifier? */ |
| 879 CXX = 4, | |
| 111 | 880 /* Valid in a C11/C++11 identifier? */ |
| 881 C11 = 8, | |
| 882 /* Valid in a C11/C++11 identifier, but not as the first character? */ | |
| 883 N11 = 16, | |
| 0 | 884 /* NFC representation is not valid in an identifier? */ |
| 111 | 885 CID = 32, |
| 0 | 886 /* Might be valid NFC form? */ |
| 111 | 887 NFC = 64, |
| 0 | 888 /* Might be valid NFKC form? */ |
| 111 | 889 NKC = 128, |
| 0 | 890 /* Certain preceding characters might make it not valid NFC/NKFC form? */ |
| 111 | 891 CTX = 256 |
| 0 | 892 }; |
| 893 | |
| 111 | 894 struct ucnrange { |
| 0 | 895 /* Bitmap of flags above. */ |
| 111 | 896 unsigned short flags; |
| 0 | 897 /* Combining class of the character. */ |
| 898 unsigned char combine; | |
| 899 /* Last character in the range described by this entry. */ | |
| 111 | 900 unsigned int end; |
| 901 }; | |
| 0 | 902 #include "ucnid.h" |
| 903 | |
| 904 /* Returns 1 if C is valid in an identifier, 2 if C is valid except at | |
| 905 the start of an identifier, and 0 if C is not valid in an | |
| 906 identifier. We assume C has already gone through the checks of | |
| 907 _cpp_valid_ucn. Also update NST for C if returning nonzero. The | |
| 908 algorithm is a simple binary search on the table defined in | |
| 909 ucnid.h. */ | |
| 910 | |
| 911 static int | |
| 912 ucn_valid_in_identifier (cpp_reader *pfile, cppchar_t c, | |
| 913 struct normalize_state *nst) | |
| 914 { | |
| 915 int mn, mx, md; | |
| 111 | 916 unsigned short valid_flags, invalid_start_flags; |
| 0 | 917 |
| 111 | 918 if (c > 0x10FFFF) |
| 0 | 919 return 0; |
| 920 | |
| 921 mn = 0; | |
| 922 mx = ARRAY_SIZE (ucnranges) - 1; | |
| 923 while (mx != mn) | |
| 924 { | |
| 925 md = (mn + mx) / 2; | |
| 926 if (c <= ucnranges[md].end) | |
| 927 mx = md; | |
| 928 else | |
| 929 mn = md + 1; | |
| 930 } | |
| 931 | |
| 932 /* When -pedantic, we require the character to have been listed by | |
| 933 the standard for the current language. Otherwise, we accept the | |
| 111 | 934 union of the acceptable sets for all supported language versions. */ |
| 935 valid_flags = C99 | CXX | C11; | |
| 936 if (CPP_PEDANTIC (pfile)) | |
| 937 { | |
| 938 if (CPP_OPTION (pfile, c11_identifiers)) | |
| 939 valid_flags = C11; | |
| 940 else if (CPP_OPTION (pfile, c99)) | |
| 941 valid_flags = C99; | |
| 942 else if (CPP_OPTION (pfile, cplusplus)) | |
| 943 valid_flags = CXX; | |
| 944 } | |
| 945 if (! (ucnranges[mn].flags & valid_flags)) | |
| 0 | 946 return 0; |
| 111 | 947 if (CPP_OPTION (pfile, c11_identifiers)) |
| 948 invalid_start_flags = N11; | |
| 949 else if (CPP_OPTION (pfile, c99)) | |
| 950 invalid_start_flags = N99; | |
| 951 else | |
| 952 invalid_start_flags = 0; | |
| 0 | 953 |
| 954 /* Update NST. */ | |
| 955 if (ucnranges[mn].combine != 0 && ucnranges[mn].combine < nst->prev_class) | |
| 956 nst->level = normalized_none; | |
| 957 else if (ucnranges[mn].flags & CTX) | |
| 958 { | |
| 959 bool safe; | |
| 960 cppchar_t p = nst->previous; | |
| 961 | |
| 962 /* For Hangul, characters in the range AC00-D7A3 are NFC/NFKC, | |
| 963 and are combined algorithmically from a sequence of the form | |
| 964 1100-1112 1161-1175 11A8-11C2 | |
| 965 (if the third is not present, it is treated as 11A7, which is not | |
| 966 really a valid character). | |
| 967 Unfortunately, C99 allows (only) the NFC form, but C++ allows | |
| 968 only the combining characters. */ | |
| 111 | 969 if (c >= 0x1161 && c <= 0x1175) |
| 0 | 970 safe = p < 0x1100 || p > 0x1112; |
| 971 else if (c >= 0x11A8 && c <= 0x11C2) | |
| 972 safe = (p < 0xAC00 || p > 0xD7A3 || (p - 0xAC00) % 28 != 0); | |
| 973 else | |
| 111 | 974 safe = check_nfc (pfile, c, p); |
| 975 if (!safe) | |
| 0 | 976 { |
| 111 | 977 if ((c >= 0x1161 && c <= 0x1175) || (c >= 0x11A8 && c <= 0x11C2)) |
| 978 nst->level = MAX (nst->level, normalized_identifier_C); | |
| 979 else | |
| 980 nst->level = normalized_none; | |
| 0 | 981 } |
| 982 } | |
| 983 else if (ucnranges[mn].flags & NKC) | |
| 984 ; | |
| 985 else if (ucnranges[mn].flags & NFC) | |
| 986 nst->level = MAX (nst->level, normalized_C); | |
| 987 else if (ucnranges[mn].flags & CID) | |
| 988 nst->level = MAX (nst->level, normalized_identifier_C); | |
| 989 else | |
| 990 nst->level = normalized_none; | |
| 111 | 991 if (ucnranges[mn].combine == 0) |
| 992 nst->previous = c; | |
| 0 | 993 nst->prev_class = ucnranges[mn].combine; |
| 994 | |
| 111 | 995 /* In C99, UCN digits may not begin identifiers. In C11 and C++11, |
| 996 UCN combining characters may not begin identifiers. */ | |
| 997 if (ucnranges[mn].flags & invalid_start_flags) | |
| 0 | 998 return 2; |
| 999 | |
| 1000 return 1; | |
| 1001 } | |
| 1002 | |
| 1003 /* [lex.charset]: The character designated by the universal character | |
| 1004 name \UNNNNNNNN is that character whose character short name in | |
| 1005 ISO/IEC 10646 is NNNNNNNN; the character designated by the | |
| 1006 universal character name \uNNNN is that character whose character | |
| 1007 short name in ISO/IEC 10646 is 0000NNNN. If the hexadecimal value | |
|
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1008 for a universal character name corresponds to a surrogate code point |
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1009 (in the range 0xD800-0xDFFF, inclusive), the program is ill-formed. |
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1010 Additionally, if the hexadecimal value for a universal-character-name |
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1011 outside a character or string literal corresponds to a control character |
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1012 (in either of the ranges 0x00-0x1F or 0x7F-0x9F, both inclusive) or to a |
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1013 character in the basic source character set, the program is ill-formed. |
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1014 |
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1015 C99 6.4.3: A universal character name shall not specify a character |
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1016 whose short identifier is less than 00A0 other than 0024 ($), 0040 (@), |
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1017 or 0060 (`), nor one in the range D800 through DFFF inclusive. |
| 0 | 1018 |
| 1019 *PSTR must be preceded by "\u" or "\U"; it is assumed that the | |
| 111 | 1020 buffer end is delimited by a non-hex digit. Returns false if the |
| 1021 UCN has not been consumed, true otherwise. | |
| 0 | 1022 |
| 111 | 1023 The value of the UCN, whether valid or invalid, is returned in *CP. |
| 1024 Diagnostics are emitted for invalid values. PSTR is updated to point | |
| 1025 one beyond the UCN, or to the syntactically invalid character. | |
| 0 | 1026 |
| 1027 IDENTIFIER_POS is 0 when not in an identifier, 1 for the start of | |
| 111 | 1028 an identifier, or 2 otherwise. |
| 0 | 1029 |
| 111 | 1030 If LOC_READER is non-NULL, then position information is |
| 1031 read from *LOC_READER and CHAR_RANGE->m_finish is updated accordingly. */ | |
| 1032 | |
| 1033 bool | |
| 0 | 1034 _cpp_valid_ucn (cpp_reader *pfile, const uchar **pstr, |
| 1035 const uchar *limit, int identifier_pos, | |
| 111 | 1036 struct normalize_state *nst, cppchar_t *cp, |
| 1037 source_range *char_range, | |
| 1038 cpp_string_location_reader *loc_reader) | |
| 0 | 1039 { |
| 1040 cppchar_t result, c; | |
| 1041 unsigned int length; | |
| 1042 const uchar *str = *pstr; | |
| 1043 const uchar *base = str - 2; | |
| 1044 | |
| 1045 if (!CPP_OPTION (pfile, cplusplus) && !CPP_OPTION (pfile, c99)) | |
| 1046 cpp_error (pfile, CPP_DL_WARNING, | |
| 1047 "universal character names are only valid in C++ and C99"); | |
| 111 | 1048 else if (CPP_OPTION (pfile, cpp_warn_c90_c99_compat) > 0 |
| 1049 && !CPP_OPTION (pfile, cplusplus)) | |
| 1050 cpp_error (pfile, CPP_DL_WARNING, | |
| 1051 "C99's universal character names are incompatible with C90"); | |
| 0 | 1052 else if (CPP_WTRADITIONAL (pfile) && identifier_pos == 0) |
|
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1053 cpp_warning (pfile, CPP_W_TRADITIONAL, |
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1054 "the meaning of '\\%c' is different in traditional C", |
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1055 (int) str[-1]); |
| 0 | 1056 |
| 1057 if (str[-1] == 'u') | |
| 1058 length = 4; | |
| 1059 else if (str[-1] == 'U') | |
| 1060 length = 8; | |
| 1061 else | |
| 1062 { | |
| 1063 cpp_error (pfile, CPP_DL_ICE, "In _cpp_valid_ucn but not a UCN"); | |
| 1064 length = 4; | |
| 1065 } | |
| 1066 | |
| 1067 result = 0; | |
| 1068 do | |
| 1069 { | |
| 1070 c = *str; | |
| 1071 if (!ISXDIGIT (c)) | |
| 1072 break; | |
| 1073 str++; | |
| 111 | 1074 if (loc_reader) |
| 1075 { | |
| 1076 gcc_assert (char_range); | |
| 1077 char_range->m_finish = loc_reader->get_next ().m_finish; | |
| 1078 } | |
| 0 | 1079 result = (result << 4) + hex_value (c); |
| 1080 } | |
| 1081 while (--length && str < limit); | |
| 1082 | |
| 1083 /* Partial UCNs are not valid in strings, but decompose into | |
| 1084 multiple tokens in identifiers, so we can't give a helpful | |
| 1085 error message in that case. */ | |
| 1086 if (length && identifier_pos) | |
| 111 | 1087 { |
| 1088 *cp = 0; | |
| 1089 return false; | |
| 1090 } | |
| 1091 | |
| 0 | 1092 *pstr = str; |
| 1093 if (length) | |
| 1094 { | |
| 1095 cpp_error (pfile, CPP_DL_ERROR, | |
| 1096 "incomplete universal character name %.*s", | |
| 1097 (int) (str - base), base); | |
| 1098 result = 1; | |
| 1099 } | |
|
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1100 /* The C99 standard permits $, @ and ` to be specified as UCNs. We use |
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1101 hex escapes so that this also works with EBCDIC hosts. |
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1102 C++0x permits everything below 0xa0 within literals; |
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1103 ucn_valid_in_identifier will complain about identifiers. */ |
| 0 | 1104 else if ((result < 0xa0 |
|
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1105 && !CPP_OPTION (pfile, cplusplus) |
| 0 | 1106 && (result != 0x24 && result != 0x40 && result != 0x60)) |
| 1107 || (result & 0x80000000) | |
| 1108 || (result >= 0xD800 && result <= 0xDFFF)) | |
| 1109 { | |
| 1110 cpp_error (pfile, CPP_DL_ERROR, | |
| 1111 "%.*s is not a valid universal character", | |
| 1112 (int) (str - base), base); | |
| 1113 result = 1; | |
| 1114 } | |
| 1115 else if (identifier_pos && result == 0x24 | |
| 1116 && CPP_OPTION (pfile, dollars_in_ident)) | |
| 1117 { | |
| 1118 if (CPP_OPTION (pfile, warn_dollars) && !pfile->state.skipping) | |
| 1119 { | |
| 1120 CPP_OPTION (pfile, warn_dollars) = 0; | |
| 1121 cpp_error (pfile, CPP_DL_PEDWARN, "'$' in identifier or number"); | |
| 1122 } | |
| 111 | 1123 NORMALIZE_STATE_UPDATE_IDNUM (nst, result); |
| 0 | 1124 } |
| 1125 else if (identifier_pos) | |
| 1126 { | |
| 1127 int validity = ucn_valid_in_identifier (pfile, result, nst); | |
| 1128 | |
| 1129 if (validity == 0) | |
| 1130 cpp_error (pfile, CPP_DL_ERROR, | |
| 1131 "universal character %.*s is not valid in an identifier", | |
| 1132 (int) (str - base), base); | |
| 1133 else if (validity == 2 && identifier_pos == 1) | |
| 1134 cpp_error (pfile, CPP_DL_ERROR, | |
| 1135 "universal character %.*s is not valid at the start of an identifier", | |
| 1136 (int) (str - base), base); | |
| 1137 } | |
| 1138 | |
| 111 | 1139 *cp = result; |
| 1140 return true; | |
| 0 | 1141 } |
| 1142 | |
| 1143 /* Convert an UCN, pointed to by FROM, to UTF-8 encoding, then translate | |
| 111 | 1144 it to the execution character set and write the result into TBUF, |
| 1145 if TBUF is non-NULL. | |
| 1146 An advanced pointer is returned. Issues all relevant diagnostics. | |
| 1147 If LOC_READER is non-NULL, then RANGES must be non-NULL and CHAR_RANGE | |
| 1148 contains the location of the character so far: location information | |
| 1149 is read from *LOC_READER, and *RANGES is updated accordingly. */ | |
| 0 | 1150 static const uchar * |
| 1151 convert_ucn (cpp_reader *pfile, const uchar *from, const uchar *limit, | |
| 111 | 1152 struct _cpp_strbuf *tbuf, struct cset_converter cvt, |
| 1153 source_range char_range, | |
| 1154 cpp_string_location_reader *loc_reader, | |
| 1155 cpp_substring_ranges *ranges) | |
| 0 | 1156 { |
| 1157 cppchar_t ucn; | |
| 1158 uchar buf[6]; | |
| 1159 uchar *bufp = buf; | |
| 1160 size_t bytesleft = 6; | |
| 1161 int rval; | |
| 1162 struct normalize_state nst = INITIAL_NORMALIZE_STATE; | |
| 1163 | |
| 111 | 1164 /* loc_reader and ranges must either be both NULL, or both be non-NULL. */ |
| 1165 gcc_assert ((loc_reader != NULL) == (ranges != NULL)); | |
| 1166 | |
| 0 | 1167 from++; /* Skip u/U. */ |
| 111 | 1168 |
| 1169 if (loc_reader) | |
| 1170 /* The u/U is part of the spelling of this character. */ | |
| 1171 char_range.m_finish = loc_reader->get_next ().m_finish; | |
| 1172 | |
| 1173 _cpp_valid_ucn (pfile, &from, limit, 0, &nst, | |
| 1174 &ucn, &char_range, loc_reader); | |
| 0 | 1175 |
| 1176 rval = one_cppchar_to_utf8 (ucn, &bufp, &bytesleft); | |
| 1177 if (rval) | |
| 1178 { | |
| 1179 errno = rval; | |
| 1180 cpp_errno (pfile, CPP_DL_ERROR, | |
| 1181 "converting UCN to source character set"); | |
| 1182 } | |
| 111 | 1183 else |
| 1184 { | |
| 1185 if (tbuf) | |
| 1186 if (!APPLY_CONVERSION (cvt, buf, 6 - bytesleft, tbuf)) | |
| 1187 cpp_errno (pfile, CPP_DL_ERROR, | |
| 1188 "converting UCN to execution character set"); | |
| 1189 | |
| 1190 if (loc_reader) | |
| 1191 { | |
| 1192 int num_encoded_bytes = 6 - bytesleft; | |
| 1193 for (int i = 0; i < num_encoded_bytes; i++) | |
| 1194 ranges->add_range (char_range); | |
| 1195 } | |
| 1196 } | |
| 0 | 1197 |
| 1198 return from; | |
| 1199 } | |
| 1200 | |
| 1201 /* Subroutine of convert_hex and convert_oct. N is the representation | |
| 1202 in the execution character set of a numeric escape; write it into the | |
| 1203 string buffer TBUF and update the end-of-string pointer therein. WIDE | |
| 1204 is true if it's a wide string that's being assembled in TBUF. This | |
| 1205 function issues no diagnostics and never fails. */ | |
| 1206 static void | |
| 1207 emit_numeric_escape (cpp_reader *pfile, cppchar_t n, | |
| 1208 struct _cpp_strbuf *tbuf, struct cset_converter cvt) | |
| 1209 { | |
| 1210 size_t width = cvt.width; | |
| 1211 | |
| 1212 if (width != CPP_OPTION (pfile, char_precision)) | |
| 1213 { | |
| 1214 /* We have to render this into the target byte order, which may not | |
| 1215 be our byte order. */ | |
| 1216 bool bigend = CPP_OPTION (pfile, bytes_big_endian); | |
| 1217 size_t cwidth = CPP_OPTION (pfile, char_precision); | |
| 1218 size_t cmask = width_to_mask (cwidth); | |
| 1219 size_t nbwc = width / cwidth; | |
| 1220 size_t i; | |
| 1221 size_t off = tbuf->len; | |
| 1222 cppchar_t c; | |
| 1223 | |
| 1224 if (tbuf->len + nbwc > tbuf->asize) | |
| 1225 { | |
| 1226 tbuf->asize += OUTBUF_BLOCK_SIZE; | |
| 1227 tbuf->text = XRESIZEVEC (uchar, tbuf->text, tbuf->asize); | |
| 1228 } | |
| 1229 | |
| 1230 for (i = 0; i < nbwc; i++) | |
| 1231 { | |
| 1232 c = n & cmask; | |
| 1233 n >>= cwidth; | |
| 1234 tbuf->text[off + (bigend ? nbwc - i - 1 : i)] = c; | |
| 1235 } | |
| 1236 tbuf->len += nbwc; | |
| 1237 } | |
| 1238 else | |
| 1239 { | |
| 1240 /* Note: this code does not handle the case where the target | |
| 1241 and host have a different number of bits in a byte. */ | |
| 1242 if (tbuf->len + 1 > tbuf->asize) | |
| 1243 { | |
| 1244 tbuf->asize += OUTBUF_BLOCK_SIZE; | |
| 1245 tbuf->text = XRESIZEVEC (uchar, tbuf->text, tbuf->asize); | |
| 1246 } | |
| 1247 tbuf->text[tbuf->len++] = n; | |
| 1248 } | |
| 1249 } | |
| 1250 | |
| 1251 /* Convert a hexadecimal escape, pointed to by FROM, to the execution | |
| 111 | 1252 character set and write it into the string buffer TBUF (if non-NULL). |
| 1253 Returns an advanced pointer, and issues diagnostics as necessary. | |
| 0 | 1254 No character set translation occurs; this routine always produces the |
| 1255 execution-set character with numeric value equal to the given hex | |
| 111 | 1256 number. You can, e.g. generate surrogate pairs this way. |
| 1257 If LOC_READER is non-NULL, then RANGES must be non-NULL and CHAR_RANGE | |
| 1258 contains the location of the character so far: location information | |
| 1259 is read from *LOC_READER, and *RANGES is updated accordingly. */ | |
| 0 | 1260 static const uchar * |
| 1261 convert_hex (cpp_reader *pfile, const uchar *from, const uchar *limit, | |
| 111 | 1262 struct _cpp_strbuf *tbuf, struct cset_converter cvt, |
| 1263 source_range char_range, | |
| 1264 cpp_string_location_reader *loc_reader, | |
| 1265 cpp_substring_ranges *ranges) | |
| 0 | 1266 { |
| 1267 cppchar_t c, n = 0, overflow = 0; | |
| 1268 int digits_found = 0; | |
| 1269 size_t width = cvt.width; | |
| 1270 size_t mask = width_to_mask (width); | |
| 1271 | |
| 111 | 1272 /* loc_reader and ranges must either be both NULL, or both be non-NULL. */ |
| 1273 gcc_assert ((loc_reader != NULL) == (ranges != NULL)); | |
| 1274 | |
| 0 | 1275 if (CPP_WTRADITIONAL (pfile)) |
|
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1276 cpp_warning (pfile, CPP_W_TRADITIONAL, |
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1277 "the meaning of '\\x' is different in traditional C"); |
| 0 | 1278 |
| 111 | 1279 /* Skip 'x'. */ |
| 1280 from++; | |
| 1281 | |
| 1282 /* The 'x' is part of the spelling of this character. */ | |
| 1283 if (loc_reader) | |
| 1284 char_range.m_finish = loc_reader->get_next ().m_finish; | |
| 1285 | |
| 0 | 1286 while (from < limit) |
| 1287 { | |
| 1288 c = *from; | |
| 1289 if (! hex_p (c)) | |
| 1290 break; | |
| 1291 from++; | |
| 111 | 1292 if (loc_reader) |
| 1293 char_range.m_finish = loc_reader->get_next ().m_finish; | |
| 0 | 1294 overflow |= n ^ (n << 4 >> 4); |
| 1295 n = (n << 4) + hex_value (c); | |
| 1296 digits_found = 1; | |
| 1297 } | |
| 1298 | |
| 1299 if (!digits_found) | |
| 1300 { | |
| 1301 cpp_error (pfile, CPP_DL_ERROR, | |
| 1302 "\\x used with no following hex digits"); | |
| 1303 return from; | |
| 1304 } | |
| 1305 | |
| 1306 if (overflow | (n != (n & mask))) | |
| 1307 { | |
| 1308 cpp_error (pfile, CPP_DL_PEDWARN, | |
| 1309 "hex escape sequence out of range"); | |
| 1310 n &= mask; | |
| 1311 } | |
| 1312 | |
| 111 | 1313 if (tbuf) |
| 1314 emit_numeric_escape (pfile, n, tbuf, cvt); | |
| 1315 if (ranges) | |
| 1316 ranges->add_range (char_range); | |
| 0 | 1317 |
| 1318 return from; | |
| 1319 } | |
| 1320 | |
| 1321 /* Convert an octal escape, pointed to by FROM, to the execution | |
| 1322 character set and write it into the string buffer TBUF. Returns an | |
| 1323 advanced pointer, and issues diagnostics as necessary. | |
| 1324 No character set translation occurs; this routine always produces the | |
| 1325 execution-set character with numeric value equal to the given octal | |
| 111 | 1326 number. |
| 1327 If LOC_READER is non-NULL, then RANGES must be non-NULL and CHAR_RANGE | |
| 1328 contains the location of the character so far: location information | |
| 1329 is read from *LOC_READER, and *RANGES is updated accordingly. */ | |
| 0 | 1330 static const uchar * |
| 1331 convert_oct (cpp_reader *pfile, const uchar *from, const uchar *limit, | |
| 111 | 1332 struct _cpp_strbuf *tbuf, struct cset_converter cvt, |
| 1333 source_range char_range, | |
| 1334 cpp_string_location_reader *loc_reader, | |
| 1335 cpp_substring_ranges *ranges) | |
| 0 | 1336 { |
| 1337 size_t count = 0; | |
| 1338 cppchar_t c, n = 0; | |
| 1339 size_t width = cvt.width; | |
| 1340 size_t mask = width_to_mask (width); | |
| 1341 bool overflow = false; | |
| 1342 | |
| 111 | 1343 /* loc_reader and ranges must either be both NULL, or both be non-NULL. */ |
| 1344 gcc_assert ((loc_reader != NULL) == (ranges != NULL)); | |
| 1345 | |
| 0 | 1346 while (from < limit && count++ < 3) |
| 1347 { | |
| 1348 c = *from; | |
| 1349 if (c < '0' || c > '7') | |
| 1350 break; | |
| 1351 from++; | |
| 111 | 1352 if (loc_reader) |
| 1353 char_range.m_finish = loc_reader->get_next ().m_finish; | |
| 0 | 1354 overflow |= n ^ (n << 3 >> 3); |
| 1355 n = (n << 3) + c - '0'; | |
| 1356 } | |
| 1357 | |
| 1358 if (n != (n & mask)) | |
| 1359 { | |
| 1360 cpp_error (pfile, CPP_DL_PEDWARN, | |
| 1361 "octal escape sequence out of range"); | |
| 1362 n &= mask; | |
| 1363 } | |
| 1364 | |
| 111 | 1365 if (tbuf) |
| 1366 emit_numeric_escape (pfile, n, tbuf, cvt); | |
| 1367 if (ranges) | |
| 1368 ranges->add_range (char_range); | |
| 0 | 1369 |
| 1370 return from; | |
| 1371 } | |
| 1372 | |
| 1373 /* Convert an escape sequence (pointed to by FROM) to its value on | |
| 1374 the target, and to the execution character set. Do not scan past | |
| 111 | 1375 LIMIT. Write the converted value into TBUF, if TBUF is non-NULL. |
| 1376 Returns an advanced pointer. Handles all relevant diagnostics. | |
| 1377 If LOC_READER is non-NULL, then RANGES must be non-NULL: location | |
| 1378 information is read from *LOC_READER, and *RANGES is updated | |
| 1379 accordingly. */ | |
| 0 | 1380 static const uchar * |
| 1381 convert_escape (cpp_reader *pfile, const uchar *from, const uchar *limit, | |
| 111 | 1382 struct _cpp_strbuf *tbuf, struct cset_converter cvt, |
| 1383 cpp_string_location_reader *loc_reader, | |
| 1384 cpp_substring_ranges *ranges) | |
| 0 | 1385 { |
| 1386 /* Values of \a \b \e \f \n \r \t \v respectively. */ | |
| 1387 #if HOST_CHARSET == HOST_CHARSET_ASCII | |
| 1388 static const uchar charconsts[] = { 7, 8, 27, 12, 10, 13, 9, 11 }; | |
| 1389 #elif HOST_CHARSET == HOST_CHARSET_EBCDIC | |
| 1390 static const uchar charconsts[] = { 47, 22, 39, 12, 21, 13, 5, 11 }; | |
| 1391 #else | |
| 1392 #error "unknown host character set" | |
| 1393 #endif | |
| 1394 | |
| 1395 uchar c; | |
| 1396 | |
| 111 | 1397 /* Record the location of the backslash. */ |
| 1398 source_range char_range; | |
| 1399 if (loc_reader) | |
| 1400 char_range = loc_reader->get_next (); | |
| 1401 | |
| 0 | 1402 c = *from; |
| 1403 switch (c) | |
| 1404 { | |
| 1405 /* UCNs, hex escapes, and octal escapes are processed separately. */ | |
| 1406 case 'u': case 'U': | |
| 111 | 1407 return convert_ucn (pfile, from, limit, tbuf, cvt, |
| 1408 char_range, loc_reader, ranges); | |
| 0 | 1409 |
| 1410 case 'x': | |
| 111 | 1411 return convert_hex (pfile, from, limit, tbuf, cvt, |
| 1412 char_range, loc_reader, ranges); | |
| 0 | 1413 break; |
| 1414 | |
| 1415 case '0': case '1': case '2': case '3': | |
| 1416 case '4': case '5': case '6': case '7': | |
| 111 | 1417 return convert_oct (pfile, from, limit, tbuf, cvt, |
| 1418 char_range, loc_reader, ranges); | |
| 0 | 1419 |
| 1420 /* Various letter escapes. Get the appropriate host-charset | |
| 1421 value into C. */ | |
| 1422 case '\\': case '\'': case '"': case '?': break; | |
| 1423 | |
| 1424 case '(': case '{': case '[': case '%': | |
| 1425 /* '\(', etc, can be used at the beginning of a line in a long | |
| 1426 string split onto multiple lines with \-newline, to prevent | |
| 1427 Emacs or other text editors from getting confused. '\%' can | |
| 1428 be used to prevent SCCS from mangling printf format strings. */ | |
| 1429 if (CPP_PEDANTIC (pfile)) | |
| 1430 goto unknown; | |
| 1431 break; | |
| 1432 | |
| 1433 case 'b': c = charconsts[1]; break; | |
| 1434 case 'f': c = charconsts[3]; break; | |
| 1435 case 'n': c = charconsts[4]; break; | |
| 1436 case 'r': c = charconsts[5]; break; | |
| 1437 case 't': c = charconsts[6]; break; | |
| 1438 case 'v': c = charconsts[7]; break; | |
| 1439 | |
| 1440 case 'a': | |
| 1441 if (CPP_WTRADITIONAL (pfile)) | |
|
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1442 cpp_warning (pfile, CPP_W_TRADITIONAL, |
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1443 "the meaning of '\\a' is different in traditional C"); |
| 0 | 1444 c = charconsts[0]; |
| 1445 break; | |
| 1446 | |
| 1447 case 'e': case 'E': | |
| 1448 if (CPP_PEDANTIC (pfile)) | |
| 1449 cpp_error (pfile, CPP_DL_PEDWARN, | |
| 1450 "non-ISO-standard escape sequence, '\\%c'", (int) c); | |
| 1451 c = charconsts[2]; | |
| 1452 break; | |
| 1453 | |
| 1454 default: | |
| 1455 unknown: | |
| 1456 if (ISGRAPH (c)) | |
| 1457 cpp_error (pfile, CPP_DL_PEDWARN, | |
|
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1458 "unknown escape sequence: '\\%c'", (int) c); |
| 0 | 1459 else |
| 1460 { | |
| 1461 /* diagnostic.c does not support "%03o". When it does, this | |
| 1462 code can use %03o directly in the diagnostic again. */ | |
| 1463 char buf[32]; | |
| 1464 sprintf(buf, "%03o", (int) c); | |
| 1465 cpp_error (pfile, CPP_DL_PEDWARN, | |
| 1466 "unknown escape sequence: '\\%s'", buf); | |
| 1467 } | |
| 1468 } | |
| 1469 | |
| 111 | 1470 if (tbuf) |
| 1471 /* Now convert what we have to the execution character set. */ | |
| 1472 if (!APPLY_CONVERSION (cvt, &c, 1, tbuf)) | |
| 1473 cpp_errno (pfile, CPP_DL_ERROR, | |
| 1474 "converting escape sequence to execution character set"); | |
| 1475 | |
| 1476 if (loc_reader) | |
| 1477 { | |
| 1478 char_range.m_finish = loc_reader->get_next ().m_finish; | |
| 1479 ranges->add_range (char_range); | |
| 1480 } | |
| 0 | 1481 |
| 1482 return from + 1; | |
| 1483 } | |
| 1484 | |
| 1485 /* TYPE is a token type. The return value is the conversion needed to | |
| 1486 convert from source to execution character set for the given type. */ | |
| 1487 static struct cset_converter | |
| 1488 converter_for_type (cpp_reader *pfile, enum cpp_ttype type) | |
| 1489 { | |
| 1490 switch (type) | |
| 1491 { | |
| 1492 default: | |
| 1493 return pfile->narrow_cset_desc; | |
| 111 | 1494 case CPP_UTF8CHAR: |
|
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1495 case CPP_UTF8STRING: |
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1496 return pfile->utf8_cset_desc; |
| 0 | 1497 case CPP_CHAR16: |
| 1498 case CPP_STRING16: | |
| 1499 return pfile->char16_cset_desc; | |
| 1500 case CPP_CHAR32: | |
| 1501 case CPP_STRING32: | |
| 1502 return pfile->char32_cset_desc; | |
| 1503 case CPP_WCHAR: | |
| 1504 case CPP_WSTRING: | |
| 1505 return pfile->wide_cset_desc; | |
| 1506 } | |
| 1507 } | |
| 1508 | |
| 1509 /* FROM is an array of cpp_string structures of length COUNT. These | |
| 1510 are to be converted from the source to the execution character set, | |
| 1511 escape sequences translated, and finally all are to be | |
| 1512 concatenated. WIDE indicates whether or not to produce a wide | |
| 111 | 1513 string. If TO is non-NULL, the result is written into TO. |
| 1514 If LOC_READERS and OUT are non-NULL, then location information | |
| 1515 is read from LOC_READERS (which must be an array of length COUNT), | |
| 1516 and location information is written to *RANGES. | |
| 1517 | |
| 1518 Returns true for success, false for failure. */ | |
| 1519 | |
| 1520 static bool | |
| 1521 cpp_interpret_string_1 (cpp_reader *pfile, const cpp_string *from, size_t count, | |
| 1522 cpp_string *to, enum cpp_ttype type, | |
| 1523 cpp_string_location_reader *loc_readers, | |
| 1524 cpp_substring_ranges *out) | |
| 0 | 1525 { |
| 1526 struct _cpp_strbuf tbuf; | |
| 1527 const uchar *p, *base, *limit; | |
| 1528 size_t i; | |
| 1529 struct cset_converter cvt = converter_for_type (pfile, type); | |
| 1530 | |
| 111 | 1531 /* loc_readers and out must either be both NULL, or both be non-NULL. */ |
| 1532 gcc_assert ((loc_readers != NULL) == (out != NULL)); | |
| 0 | 1533 |
| 111 | 1534 if (to) |
| 1535 { | |
| 1536 tbuf.asize = MAX (OUTBUF_BLOCK_SIZE, from->len); | |
| 1537 tbuf.text = XNEWVEC (uchar, tbuf.asize); | |
| 1538 tbuf.len = 0; | |
| 1539 } | |
| 1540 | |
| 1541 cpp_string_location_reader *loc_reader = NULL; | |
| 0 | 1542 for (i = 0; i < count; i++) |
| 1543 { | |
| 111 | 1544 if (loc_readers) |
| 1545 loc_reader = &loc_readers[i]; | |
| 1546 | |
| 0 | 1547 p = from[i].text; |
|
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1548 if (*p == 'u') |
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1549 { |
| 111 | 1550 p++; |
| 1551 if (loc_reader) | |
| 1552 loc_reader->get_next (); | |
| 1553 if (*p == '8') | |
| 1554 { | |
| 1555 p++; | |
| 1556 if (loc_reader) | |
| 1557 loc_reader->get_next (); | |
| 1558 } | |
|
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1559 } |
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1560 else if (*p == 'L' || *p == 'U') p++; |
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1561 if (*p == 'R') |
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1562 { |
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1563 const uchar *prefix; |
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1564 |
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1565 /* Skip over 'R"'. */ |
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1566 p += 2; |
| 111 | 1567 if (loc_reader) |
| 1568 { | |
| 1569 loc_reader->get_next (); | |
| 1570 loc_reader->get_next (); | |
| 1571 } | |
|
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1572 prefix = p; |
|
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1573 while (*p != '(') |
| 111 | 1574 { |
| 1575 p++; | |
| 1576 if (loc_reader) | |
| 1577 loc_reader->get_next (); | |
| 1578 } | |
|
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1579 p++; |
| 111 | 1580 if (loc_reader) |
| 1581 loc_reader->get_next (); | |
|
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1582 limit = from[i].text + from[i].len; |
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1583 if (limit >= p + (p - prefix) + 1) |
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1584 limit -= (p - prefix) + 1; |
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1585 |
|
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1586 /* Raw strings are all normal characters; these can be fed |
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1587 directly to convert_cset. */ |
| 111 | 1588 if (to) |
| 1589 if (!APPLY_CONVERSION (cvt, p, limit - p, &tbuf)) | |
| 1590 goto fail; | |
| 1591 | |
| 1592 if (loc_reader) | |
| 1593 { | |
| 1594 /* If generating source ranges, assume we have a 1:1 | |
| 1595 correspondence between bytes in the source encoding and bytes | |
| 1596 in the execution encoding (e.g. if we have a UTF-8 to UTF-8 | |
| 1597 conversion), so that this run of bytes in the source file | |
| 1598 corresponds to a run of bytes in the execution string. | |
| 1599 This requirement is guaranteed by an early-reject in | |
| 1600 cpp_interpret_string_ranges. */ | |
| 1601 gcc_assert (cvt.func == convert_no_conversion); | |
| 1602 out->add_n_ranges (limit - p, *loc_reader); | |
| 1603 } | |
|
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1604 |
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1605 continue; |
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1606 } |
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1607 |
| 111 | 1608 /* If we don't now have a leading quote, something has gone wrong. |
| 1609 This can occur if cpp_interpret_string_ranges is handling a | |
| 1610 stringified macro argument, but should not be possible otherwise. */ | |
| 1611 if (*p != '"' && *p != '\'') | |
| 1612 { | |
| 1613 gcc_assert (out != NULL); | |
| 1614 cpp_error (pfile, CPP_DL_ERROR, "missing open quote"); | |
| 1615 if (to) | |
| 1616 free (tbuf.text); | |
| 1617 return false; | |
| 1618 } | |
| 1619 | |
| 1620 /* Skip leading quote. */ | |
| 1621 p++; | |
| 1622 if (loc_reader) | |
| 1623 loc_reader->get_next (); | |
| 1624 | |
| 0 | 1625 limit = from[i].text + from[i].len - 1; /* Skip trailing quote. */ |
| 1626 | |
| 1627 for (;;) | |
| 1628 { | |
| 1629 base = p; | |
| 1630 while (p < limit && *p != '\\') | |
| 1631 p++; | |
| 1632 if (p > base) | |
| 1633 { | |
| 1634 /* We have a run of normal characters; these can be fed | |
| 1635 directly to convert_cset. */ | |
| 111 | 1636 if (to) |
| 1637 if (!APPLY_CONVERSION (cvt, base, p - base, &tbuf)) | |
| 1638 goto fail; | |
| 1639 /* Similar to above: assumes we have a 1:1 correspondence | |
| 1640 between bytes in the source encoding and bytes in the | |
| 1641 execution encoding. */ | |
| 1642 if (loc_reader) | |
| 1643 { | |
| 1644 gcc_assert (cvt.func == convert_no_conversion); | |
| 1645 out->add_n_ranges (p - base, *loc_reader); | |
| 1646 } | |
| 0 | 1647 } |
| 111 | 1648 if (p >= limit) |
| 0 | 1649 break; |
| 1650 | |
| 111 | 1651 struct _cpp_strbuf *tbuf_ptr = to ? &tbuf : NULL; |
| 1652 p = convert_escape (pfile, p + 1, limit, tbuf_ptr, cvt, | |
| 1653 loc_reader, out); | |
| 0 | 1654 } |
| 1655 } | |
| 111 | 1656 |
| 1657 if (to) | |
| 1658 { | |
| 1659 /* NUL-terminate the 'to' buffer and translate it to a cpp_string | |
| 1660 structure. */ | |
| 1661 emit_numeric_escape (pfile, 0, &tbuf, cvt); | |
| 1662 tbuf.text = XRESIZEVEC (uchar, tbuf.text, tbuf.len); | |
| 1663 to->text = tbuf.text; | |
| 1664 to->len = tbuf.len; | |
| 1665 } | |
| 1666 /* Use the location of the trailing quote as the location of the | |
| 1667 NUL-terminator. */ | |
| 1668 if (loc_reader) | |
| 1669 { | |
| 1670 source_range range = loc_reader->get_next (); | |
| 1671 out->add_range (range); | |
| 1672 } | |
| 1673 | |
| 0 | 1674 return true; |
| 1675 | |
| 1676 fail: | |
| 1677 cpp_errno (pfile, CPP_DL_ERROR, "converting to execution character set"); | |
| 111 | 1678 if (to) |
| 1679 free (tbuf.text); | |
| 0 | 1680 return false; |
| 1681 } | |
| 1682 | |
| 111 | 1683 /* FROM is an array of cpp_string structures of length COUNT. These |
| 1684 are to be converted from the source to the execution character set, | |
| 1685 escape sequences translated, and finally all are to be | |
| 1686 concatenated. WIDE indicates whether or not to produce a wide | |
| 1687 string. The result is written into TO. Returns true for success, | |
| 1688 false for failure. */ | |
| 1689 bool | |
| 1690 cpp_interpret_string (cpp_reader *pfile, const cpp_string *from, size_t count, | |
| 1691 cpp_string *to, enum cpp_ttype type) | |
| 1692 { | |
| 1693 return cpp_interpret_string_1 (pfile, from, count, to, type, NULL, NULL); | |
| 1694 } | |
| 1695 | |
| 1696 /* A "do nothing" error-handling callback for use by | |
| 1697 cpp_interpret_string_ranges, so that it can temporarily suppress | |
| 1698 error-handling. */ | |
| 1699 | |
| 1700 static bool | |
| 1701 noop_error_cb (cpp_reader *, int, int, rich_location *, | |
| 1702 const char *, va_list *) | |
| 1703 { | |
| 1704 /* no-op. */ | |
| 1705 return true; | |
| 1706 } | |
| 1707 | |
| 1708 /* This function mimics the behavior of cpp_interpret_string, but | |
| 1709 rather than generating a string in the execution character set, | |
| 1710 *OUT is written to with the source code ranges of the characters | |
| 1711 in such a string. | |
| 1712 FROM and LOC_READERS should both be arrays of length COUNT. | |
| 1713 Returns NULL for success, or an error message for failure. */ | |
| 1714 | |
| 1715 const char * | |
| 1716 cpp_interpret_string_ranges (cpp_reader *pfile, const cpp_string *from, | |
| 1717 cpp_string_location_reader *loc_readers, | |
| 1718 size_t count, | |
| 1719 cpp_substring_ranges *out, | |
| 1720 enum cpp_ttype type) | |
| 1721 { | |
| 1722 /* There are a couple of cases in the range-handling in | |
| 1723 cpp_interpret_string_1 that rely on there being a 1:1 correspondence | |
| 1724 between bytes in the source encoding and bytes in the execution | |
| 1725 encoding, so that each byte in the execution string can correspond | |
| 1726 to the location of a byte in the source string. | |
| 1727 | |
| 1728 This holds for the typical case of a UTF-8 to UTF-8 conversion. | |
| 1729 Enforce this requirement by only attempting to track substring | |
| 1730 locations if we have source encoding == execution encoding. | |
| 1731 | |
| 1732 This is a stronger condition than we need, since we could e.g. | |
| 1733 have ASCII to EBCDIC (with 1 byte per character before and after), | |
| 1734 but it seems to be a reasonable restriction. */ | |
| 1735 struct cset_converter cvt = converter_for_type (pfile, type); | |
| 1736 if (cvt.func != convert_no_conversion) | |
| 1737 return "execution character set != source character set"; | |
| 1738 | |
| 1739 /* For on-demand strings we have already lexed the strings, so there | |
| 1740 should be no errors. However, if we have bogus source location | |
| 1741 data (or stringified macro arguments), the attempt to lex the | |
| 1742 strings could fail with an error. Temporarily install an | |
| 1743 error-handler to catch the error, so that it can lead to this call | |
| 1744 failing, rather than being emitted as a user-visible diagnostic. | |
| 1745 If an error does occur, we should see it via the return value of | |
| 1746 cpp_interpret_string_1. */ | |
| 1747 bool (*saved_error_handler) (cpp_reader *, int, int, rich_location *, | |
| 1748 const char *, va_list *) | |
| 1749 ATTRIBUTE_FPTR_PRINTF(5,0); | |
| 1750 | |
| 1751 saved_error_handler = pfile->cb.error; | |
| 1752 pfile->cb.error = noop_error_cb; | |
| 1753 | |
| 1754 bool result = cpp_interpret_string_1 (pfile, from, count, NULL, type, | |
| 1755 loc_readers, out); | |
| 1756 | |
| 1757 /* Restore the saved error-handler. */ | |
| 1758 pfile->cb.error = saved_error_handler; | |
| 1759 | |
| 1760 if (!result) | |
| 1761 return "cpp_interpret_string_1 failed"; | |
| 1762 | |
| 1763 /* Success. */ | |
| 1764 return NULL; | |
| 1765 } | |
| 1766 | |
| 0 | 1767 /* Subroutine of do_line and do_linemarker. Convert escape sequences |
| 1768 in a string, but do not perform character set conversion. */ | |
| 1769 bool | |
| 1770 cpp_interpret_string_notranslate (cpp_reader *pfile, const cpp_string *from, | |
| 1771 size_t count, cpp_string *to, | |
| 1772 enum cpp_ttype type ATTRIBUTE_UNUSED) | |
| 1773 { | |
| 1774 struct cset_converter save_narrow_cset_desc = pfile->narrow_cset_desc; | |
| 1775 bool retval; | |
| 1776 | |
| 1777 pfile->narrow_cset_desc.func = convert_no_conversion; | |
| 1778 pfile->narrow_cset_desc.cd = (iconv_t) -1; | |
| 1779 pfile->narrow_cset_desc.width = CPP_OPTION (pfile, char_precision); | |
| 1780 | |
| 1781 retval = cpp_interpret_string (pfile, from, count, to, CPP_STRING); | |
| 1782 | |
| 1783 pfile->narrow_cset_desc = save_narrow_cset_desc; | |
| 1784 return retval; | |
| 1785 } | |
| 1786 | |
| 1787 | |
| 1788 /* Subroutine of cpp_interpret_charconst which performs the conversion | |
| 1789 to a number, for narrow strings. STR is the string structure returned | |
| 1790 by cpp_interpret_string. PCHARS_SEEN and UNSIGNEDP are as for | |
| 1791 cpp_interpret_charconst. */ | |
| 1792 static cppchar_t | |
| 1793 narrow_str_to_charconst (cpp_reader *pfile, cpp_string str, | |
| 1794 unsigned int *pchars_seen, int *unsignedp) | |
| 1795 { | |
| 1796 size_t width = CPP_OPTION (pfile, char_precision); | |
| 1797 size_t max_chars = CPP_OPTION (pfile, int_precision) / width; | |
| 1798 size_t mask = width_to_mask (width); | |
| 1799 size_t i; | |
| 1800 cppchar_t result, c; | |
| 1801 bool unsigned_p; | |
| 1802 | |
| 1803 /* The value of a multi-character character constant, or a | |
| 1804 single-character character constant whose representation in the | |
| 1805 execution character set is more than one byte long, is | |
| 1806 implementation defined. This implementation defines it to be the | |
| 1807 number formed by interpreting the byte sequence in memory as a | |
| 1808 big-endian binary number. If overflow occurs, the high bytes are | |
| 1809 lost, and a warning is issued. | |
| 1810 | |
| 1811 We don't want to process the NUL terminator handed back by | |
| 1812 cpp_interpret_string. */ | |
| 1813 result = 0; | |
| 1814 for (i = 0; i < str.len - 1; i++) | |
| 1815 { | |
| 1816 c = str.text[i] & mask; | |
| 1817 if (width < BITS_PER_CPPCHAR_T) | |
| 1818 result = (result << width) | c; | |
| 1819 else | |
| 1820 result = c; | |
| 1821 } | |
| 1822 | |
| 1823 if (i > max_chars) | |
| 1824 { | |
| 1825 i = max_chars; | |
| 1826 cpp_error (pfile, CPP_DL_WARNING, | |
| 1827 "character constant too long for its type"); | |
| 1828 } | |
| 1829 else if (i > 1 && CPP_OPTION (pfile, warn_multichar)) | |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1830 cpp_warning (pfile, CPP_W_MULTICHAR, "multi-character character constant"); |
| 0 | 1831 |
| 1832 /* Multichar constants are of type int and therefore signed. */ | |
| 1833 if (i > 1) | |
| 1834 unsigned_p = 0; | |
| 1835 else | |
| 1836 unsigned_p = CPP_OPTION (pfile, unsigned_char); | |
| 1837 | |
| 1838 /* Truncate the constant to its natural width, and simultaneously | |
| 1839 sign- or zero-extend to the full width of cppchar_t. | |
| 1840 For single-character constants, the value is WIDTH bits wide. | |
| 1841 For multi-character constants, the value is INT_PRECISION bits wide. */ | |
| 1842 if (i > 1) | |
| 1843 width = CPP_OPTION (pfile, int_precision); | |
| 1844 if (width < BITS_PER_CPPCHAR_T) | |
| 1845 { | |
| 1846 mask = ((cppchar_t) 1 << width) - 1; | |
| 1847 if (unsigned_p || !(result & (1 << (width - 1)))) | |
| 1848 result &= mask; | |
| 1849 else | |
| 1850 result |= ~mask; | |
| 1851 } | |
| 1852 *pchars_seen = i; | |
| 1853 *unsignedp = unsigned_p; | |
| 1854 return result; | |
| 1855 } | |
| 1856 | |
| 1857 /* Subroutine of cpp_interpret_charconst which performs the conversion | |
| 1858 to a number, for wide strings. STR is the string structure returned | |
| 1859 by cpp_interpret_string. PCHARS_SEEN and UNSIGNEDP are as for | |
| 1860 cpp_interpret_charconst. TYPE is the token type. */ | |
| 1861 static cppchar_t | |
| 1862 wide_str_to_charconst (cpp_reader *pfile, cpp_string str, | |
| 1863 unsigned int *pchars_seen, int *unsignedp, | |
| 1864 enum cpp_ttype type) | |
| 1865 { | |
| 1866 bool bigend = CPP_OPTION (pfile, bytes_big_endian); | |
| 1867 size_t width = converter_for_type (pfile, type).width; | |
| 1868 size_t cwidth = CPP_OPTION (pfile, char_precision); | |
| 1869 size_t mask = width_to_mask (width); | |
| 1870 size_t cmask = width_to_mask (cwidth); | |
| 1871 size_t nbwc = width / cwidth; | |
| 1872 size_t off, i; | |
| 1873 cppchar_t result = 0, c; | |
| 1874 | |
| 1875 /* This is finicky because the string is in the target's byte order, | |
| 1876 which may not be our byte order. Only the last character, ignoring | |
| 1877 the NUL terminator, is relevant. */ | |
| 1878 off = str.len - (nbwc * 2); | |
| 1879 result = 0; | |
| 1880 for (i = 0; i < nbwc; i++) | |
| 1881 { | |
| 1882 c = bigend ? str.text[off + i] : str.text[off + nbwc - i - 1]; | |
| 1883 result = (result << cwidth) | (c & cmask); | |
| 1884 } | |
| 1885 | |
| 1886 /* Wide character constants have type wchar_t, and a single | |
| 1887 character exactly fills a wchar_t, so a multi-character wide | |
| 1888 character constant is guaranteed to overflow. */ | |
| 1889 if (str.len > nbwc * 2) | |
| 1890 cpp_error (pfile, CPP_DL_WARNING, | |
| 1891 "character constant too long for its type"); | |
| 1892 | |
| 1893 /* Truncate the constant to its natural width, and simultaneously | |
| 1894 sign- or zero-extend to the full width of cppchar_t. */ | |
| 1895 if (width < BITS_PER_CPPCHAR_T) | |
| 1896 { | |
| 1897 if (type == CPP_CHAR16 || type == CPP_CHAR32 | |
| 1898 || CPP_OPTION (pfile, unsigned_wchar) | |
| 1899 || !(result & (1 << (width - 1)))) | |
| 1900 result &= mask; | |
| 1901 else | |
| 1902 result |= ~mask; | |
| 1903 } | |
| 1904 | |
| 1905 if (type == CPP_CHAR16 || type == CPP_CHAR32 | |
| 1906 || CPP_OPTION (pfile, unsigned_wchar)) | |
| 1907 *unsignedp = 1; | |
| 1908 else | |
| 1909 *unsignedp = 0; | |
| 1910 | |
| 1911 *pchars_seen = 1; | |
| 1912 return result; | |
| 1913 } | |
| 1914 | |
| 1915 /* Interpret a (possibly wide) character constant in TOKEN. | |
| 1916 PCHARS_SEEN points to a variable that is filled in with the number | |
| 1917 of characters seen, and UNSIGNEDP to a variable that indicates | |
| 1918 whether the result has signed type. */ | |
| 1919 cppchar_t | |
| 1920 cpp_interpret_charconst (cpp_reader *pfile, const cpp_token *token, | |
| 1921 unsigned int *pchars_seen, int *unsignedp) | |
| 1922 { | |
| 1923 cpp_string str = { 0, 0 }; | |
| 111 | 1924 bool wide = (token->type != CPP_CHAR && token->type != CPP_UTF8CHAR); |
| 1925 int u8 = 2 * int(token->type == CPP_UTF8CHAR); | |
| 0 | 1926 cppchar_t result; |
| 1927 | |
| 111 | 1928 /* An empty constant will appear as L'', u'', U'', u8'', or '' */ |
| 1929 if (token->val.str.len == (size_t) (2 + wide + u8)) | |
| 0 | 1930 { |
| 1931 cpp_error (pfile, CPP_DL_ERROR, "empty character constant"); | |
| 111 | 1932 *pchars_seen = 0; |
| 1933 *unsignedp = 0; | |
| 0 | 1934 return 0; |
| 1935 } | |
| 111 | 1936 else if (!cpp_interpret_string (pfile, &token->val.str, 1, &str, |
| 1937 token->type)) | |
| 1938 { | |
| 1939 *pchars_seen = 0; | |
| 1940 *unsignedp = 0; | |
| 1941 return 0; | |
| 1942 } | |
| 0 | 1943 |
| 1944 if (wide) | |
| 1945 result = wide_str_to_charconst (pfile, str, pchars_seen, unsignedp, | |
| 1946 token->type); | |
| 1947 else | |
| 1948 result = narrow_str_to_charconst (pfile, str, pchars_seen, unsignedp); | |
| 1949 | |
| 1950 if (str.text != token->val.str.text) | |
| 1951 free ((void *)str.text); | |
| 1952 | |
| 1953 return result; | |
| 1954 } | |
| 1955 | |
| 1956 /* Convert an identifier denoted by ID and LEN, which might contain | |
| 1957 UCN escapes, to the source character set, either UTF-8 or | |
| 1958 UTF-EBCDIC. Assumes that the identifier is actually a valid identifier. */ | |
| 1959 cpp_hashnode * | |
| 1960 _cpp_interpret_identifier (cpp_reader *pfile, const uchar *id, size_t len) | |
| 1961 { | |
| 1962 /* It turns out that a UCN escape always turns into fewer characters | |
| 1963 than the escape itself, so we can allocate a temporary in advance. */ | |
| 1964 uchar * buf = (uchar *) alloca (len + 1); | |
| 1965 uchar * bufp = buf; | |
| 1966 size_t idp; | |
| 1967 | |
| 1968 for (idp = 0; idp < len; idp++) | |
| 1969 if (id[idp] != '\\') | |
| 1970 *bufp++ = id[idp]; | |
| 1971 else | |
| 1972 { | |
| 1973 unsigned length = id[idp+1] == 'u' ? 4 : 8; | |
| 1974 cppchar_t value = 0; | |
| 1975 size_t bufleft = len - (bufp - buf); | |
| 1976 int rval; | |
| 1977 | |
| 1978 idp += 2; | |
| 1979 while (length && idp < len && ISXDIGIT (id[idp])) | |
| 1980 { | |
| 1981 value = (value << 4) + hex_value (id[idp]); | |
| 1982 idp++; | |
| 1983 length--; | |
| 1984 } | |
| 1985 idp--; | |
| 1986 | |
| 1987 /* Special case for EBCDIC: if the identifier contains | |
| 1988 a '$' specified using a UCN, translate it to EBCDIC. */ | |
| 1989 if (value == 0x24) | |
| 1990 { | |
| 1991 *bufp++ = '$'; | |
| 1992 continue; | |
| 1993 } | |
| 1994 | |
| 1995 rval = one_cppchar_to_utf8 (value, &bufp, &bufleft); | |
| 1996 if (rval) | |
| 1997 { | |
| 1998 errno = rval; | |
| 1999 cpp_errno (pfile, CPP_DL_ERROR, | |
| 2000 "converting UCN to source character set"); | |
| 2001 break; | |
| 2002 } | |
| 2003 } | |
| 2004 | |
| 2005 return CPP_HASHNODE (ht_lookup (pfile->hash_table, | |
| 2006 buf, bufp - buf, HT_ALLOC)); | |
| 2007 } | |
| 2008 | |
| 2009 /* Convert an input buffer (containing the complete contents of one | |
| 2010 source file) from INPUT_CHARSET to the source character set. INPUT | |
| 2011 points to the input buffer, SIZE is its allocated size, and LEN is | |
| 2012 the length of the meaningful data within the buffer. The | |
| 2013 translated buffer is returned, *ST_SIZE is set to the length of | |
| 2014 the meaningful data within the translated buffer, and *BUFFER_START | |
| 2015 is set to the start of the returned buffer. *BUFFER_START may | |
| 2016 differ from the return value in the case of a BOM or other ignored | |
| 2017 marker information. | |
| 2018 | |
| 2019 INPUT is expected to have been allocated with xmalloc. This | |
| 2020 function will either set *BUFFER_START to INPUT, or free it and set | |
| 2021 *BUFFER_START to a pointer to another xmalloc-allocated block of | |
| 2022 memory. */ | |
| 2023 uchar * | |
| 2024 _cpp_convert_input (cpp_reader *pfile, const char *input_charset, | |
| 2025 uchar *input, size_t size, size_t len, | |
| 2026 const unsigned char **buffer_start, off_t *st_size) | |
| 2027 { | |
| 2028 struct cset_converter input_cset; | |
| 2029 struct _cpp_strbuf to; | |
| 2030 unsigned char *buffer; | |
| 2031 | |
| 2032 input_cset = init_iconv_desc (pfile, SOURCE_CHARSET, input_charset); | |
| 2033 if (input_cset.func == convert_no_conversion) | |
| 2034 { | |
| 2035 to.text = input; | |
| 2036 to.asize = size; | |
| 2037 to.len = len; | |
| 2038 } | |
| 2039 else | |
| 2040 { | |
| 2041 to.asize = MAX (65536, len); | |
| 2042 to.text = XNEWVEC (uchar, to.asize); | |
| 2043 to.len = 0; | |
| 2044 | |
| 2045 if (!APPLY_CONVERSION (input_cset, input, len, &to)) | |
| 2046 cpp_error (pfile, CPP_DL_ERROR, | |
| 2047 "failure to convert %s to %s", | |
| 2048 CPP_OPTION (pfile, input_charset), SOURCE_CHARSET); | |
| 2049 | |
| 2050 free (input); | |
| 2051 } | |
| 2052 | |
| 2053 /* Clean up the mess. */ | |
| 2054 if (input_cset.func == convert_using_iconv) | |
| 2055 iconv_close (input_cset.cd); | |
| 2056 | |
| 2057 /* Resize buffer if we allocated substantially too much, or if we | |
| 111 | 2058 haven't enough space for the \n-terminator or following |
| 2059 15 bytes of padding (used to quiet warnings from valgrind or | |
| 2060 Address Sanitizer, when the optimized lexer accesses aligned | |
| 2061 16-byte memory chunks, including the bytes after the malloced, | |
| 2062 area, and stops lexing on '\n'). */ | |
| 2063 if (to.len + 4096 < to.asize || to.len + 16 > to.asize) | |
| 2064 to.text = XRESIZEVEC (uchar, to.text, to.len + 16); | |
| 2065 | |
| 2066 memset (to.text + to.len, '\0', 16); | |
| 0 | 2067 |
| 2068 /* If the file is using old-school Mac line endings (\r only), | |
| 2069 terminate with another \r, not an \n, so that we do not mistake | |
| 2070 the \r\n sequence for a single DOS line ending and erroneously | |
| 2071 issue the "No newline at end of file" diagnostic. */ | |
| 2072 if (to.len && to.text[to.len - 1] == '\r') | |
| 2073 to.text[to.len] = '\r'; | |
| 2074 else | |
| 2075 to.text[to.len] = '\n'; | |
| 2076 | |
| 2077 buffer = to.text; | |
| 2078 *st_size = to.len; | |
| 2079 #if HOST_CHARSET == HOST_CHARSET_ASCII | |
| 2080 /* The HOST_CHARSET test just above ensures that the source charset | |
| 2081 is UTF-8. So, ignore a UTF-8 BOM if we see one. Note that | |
| 2082 glib'c UTF-8 iconv() provider (as of glibc 2.7) does not ignore a | |
| 2083 BOM -- however, even if it did, we would still need this code due | |
| 2084 to the 'convert_no_conversion' case. */ | |
| 2085 if (to.len >= 3 && to.text[0] == 0xef && to.text[1] == 0xbb | |
| 2086 && to.text[2] == 0xbf) | |
| 2087 { | |
| 2088 *st_size -= 3; | |
| 2089 buffer += 3; | |
| 2090 } | |
| 2091 #endif | |
| 2092 | |
| 2093 *buffer_start = to.text; | |
| 2094 return buffer; | |
| 2095 } | |
| 2096 | |
| 2097 /* Decide on the default encoding to assume for input files. */ | |
| 2098 const char * | |
| 2099 _cpp_default_encoding (void) | |
| 2100 { | |
| 2101 const char *current_encoding = NULL; | |
| 2102 | |
| 2103 /* We disable this because the default codeset is 7-bit ASCII on | |
| 2104 most platforms, and this causes conversion failures on every | |
| 2105 file in GCC that happens to have one of the upper 128 characters | |
| 2106 in it -- most likely, as part of the name of a contributor. | |
| 2107 We should definitely recognize in-band markers of file encoding, | |
| 2108 like: | |
| 2109 - the appropriate Unicode byte-order mark (FE FF) to recognize | |
| 2110 UTF16 and UCS4 (in both big-endian and little-endian flavors) | |
| 2111 and UTF8 | |
| 2112 - a "#i", "#d", "/ *", "//", " #p" or "#p" (for #pragma) to | |
| 2113 distinguish ASCII and EBCDIC. | |
| 2114 - now we can parse something like "#pragma GCC encoding <xyz> | |
| 2115 on the first line, or even Emacs/VIM's mode line tags (there's | |
| 2116 a problem here in that VIM uses the last line, and Emacs has | |
| 2117 its more elaborate "local variables" convention). | |
| 2118 - investigate whether Java has another common convention, which | |
| 2119 would be friendly to support. | |
| 2120 (Zack Weinberg and Paolo Bonzini, May 20th 2004) */ | |
| 2121 #if defined (HAVE_LOCALE_H) && defined (HAVE_LANGINFO_CODESET) && 0 | |
| 2122 setlocale (LC_CTYPE, ""); | |
| 2123 current_encoding = nl_langinfo (CODESET); | |
| 2124 #endif | |
| 2125 if (current_encoding == NULL || *current_encoding == '\0') | |
| 2126 current_encoding = SOURCE_CHARSET; | |
| 2127 | |
| 2128 return current_encoding; | |
| 2129 } | |
| 111 | 2130 |
| 2131 /* Implementation of class cpp_string_location_reader. */ | |
| 2132 | |
| 2133 /* Constructor for cpp_string_location_reader. */ | |
| 2134 | |
| 2135 cpp_string_location_reader:: | |
| 2136 cpp_string_location_reader (source_location src_loc, | |
| 2137 line_maps *line_table) | |
| 2138 : m_line_table (line_table) | |
| 2139 { | |
| 2140 src_loc = get_range_from_loc (line_table, src_loc).m_start; | |
| 2141 | |
| 2142 /* SRC_LOC might be a macro location. It only makes sense to do | |
| 2143 column-by-column calculations on ordinary maps, so get the | |
| 2144 corresponding location in an ordinary map. */ | |
| 2145 m_loc | |
| 2146 = linemap_resolve_location (line_table, src_loc, | |
| 2147 LRK_SPELLING_LOCATION, NULL); | |
| 2148 | |
| 2149 const line_map_ordinary *map | |
| 2150 = linemap_check_ordinary (linemap_lookup (line_table, m_loc)); | |
| 2151 m_offset_per_column = (1 << map->m_range_bits); | |
| 2152 } | |
| 2153 | |
| 2154 /* Get the range of the next source byte. */ | |
| 2155 | |
| 2156 source_range | |
| 2157 cpp_string_location_reader::get_next () | |
| 2158 { | |
| 2159 source_range result; | |
| 2160 result.m_start = m_loc; | |
| 2161 result.m_finish = m_loc; | |
| 2162 if (m_loc <= LINE_MAP_MAX_LOCATION_WITH_COLS) | |
| 2163 m_loc += m_offset_per_column; | |
| 2164 return result; | |
| 2165 } |