| 1 | /* This is the Assembler Pre-Processor |
| 2 | Copyright (C) 1987, 1990, 1991, 1992 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GAS, the GNU Assembler. |
| 5 | |
| 6 | GAS is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2, or (at your option) |
| 9 | any later version. |
| 10 | |
| 11 | GAS 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 GAS; see the file COPYING. If not, write to |
| 18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | /* Modified by Allen Wirfs-Brock, Instantiations Inc 2/90 */ |
| 21 | /* App, the assembler pre-processor. This pre-processor strips out excess |
| 22 | spaces, turns single-quoted characters into a decimal constant, and turns |
| 23 | # <number> <filename> <garbage> into a .line <number>\n.file <filename> |
| 24 | pair. This needs better error-handling. |
| 25 | */ |
| 26 | |
| 27 | #include <stdio.h> |
| 28 | #include "as.h" /* For BAD_CASE() only */ |
| 29 | |
| 30 | #if (__STDC__ != 1) && !defined(const) |
| 31 | #define const /* Nothing */ |
| 32 | #endif |
| 33 | |
| 34 | static char lex[256]; |
| 35 | static const char symbol_chars[] = |
| 36 | "$._ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; |
| 37 | |
| 38 | #define LEX_IS_SYMBOL_COMPONENT 1 |
| 39 | #define LEX_IS_WHITESPACE 2 |
| 40 | #define LEX_IS_LINE_SEPARATOR 3 |
| 41 | #define LEX_IS_COMMENT_START 4 |
| 42 | #define LEX_IS_LINE_COMMENT_START 5 |
| 43 | #define LEX_IS_TWOCHAR_COMMENT_1ST 6 |
| 44 | #define LEX_IS_TWOCHAR_COMMENT_2ND 7 |
| 45 | #define LEX_IS_STRINGQUOTE 8 |
| 46 | #define LEX_IS_COLON 9 |
| 47 | #define LEX_IS_NEWLINE 10 |
| 48 | #define LEX_IS_ONECHAR_QUOTE 11 |
| 49 | #define IS_SYMBOL_COMPONENT(c) (lex[c] == LEX_IS_SYMBOL_COMPONENT) |
| 50 | #define IS_WHITESPACE(c) (lex[c] == LEX_IS_WHITESPACE) |
| 51 | #define IS_LINE_SEPARATOR(c) (lex[c] == LEX_IS_LINE_SEPARATOR) |
| 52 | #define IS_COMMENT(c) (lex[c] == LEX_IS_COMMENT_START) |
| 53 | #define IS_LINE_COMMENT(c) (lex[c] == LEX_IS_LINE_COMMENT_START) |
| 54 | #define IS_NEWLINE(c) (lex[c] == LEX_IS_NEWLINE) |
| 55 | |
| 56 | /* FIXME-soon: The entire lexer/parser thingy should be |
| 57 | built statically at compile time rather than dynamically |
| 58 | each and every time the assembler is run. xoxorich. */ |
| 59 | |
| 60 | void |
| 61 | do_scrub_begin () |
| 62 | { |
| 63 | const char *p; |
| 64 | |
| 65 | lex[' '] = LEX_IS_WHITESPACE; |
| 66 | lex['\t'] = LEX_IS_WHITESPACE; |
| 67 | lex['\n'] = LEX_IS_NEWLINE; |
| 68 | lex[';'] = LEX_IS_LINE_SEPARATOR; |
| 69 | lex['"'] = LEX_IS_STRINGQUOTE; |
| 70 | #ifndef TC_HPPA |
| 71 | lex['\''] = LEX_IS_ONECHAR_QUOTE; |
| 72 | #endif |
| 73 | lex[':'] = LEX_IS_COLON; |
| 74 | |
| 75 | |
| 76 | |
| 77 | #ifdef SINGLE_QUOTE_STRINGS |
| 78 | lex['\''] = LEX_IS_STRINGQUOTE; |
| 79 | #endif |
| 80 | |
| 81 | /* Note that these override the previous defaults, e.g. if ';' |
| 82 | |
| 83 | is a comment char, then it isn't a line separator. */ |
| 84 | for (p = symbol_chars; *p; ++p) |
| 85 | { |
| 86 | lex[(unsigned char) *p] = LEX_IS_SYMBOL_COMPONENT; |
| 87 | } /* declare symbol characters */ |
| 88 | |
| 89 | for (p = comment_chars; *p; p++) |
| 90 | { |
| 91 | lex[(unsigned char) *p] = LEX_IS_COMMENT_START; |
| 92 | } /* declare comment chars */ |
| 93 | |
| 94 | for (p = line_comment_chars; *p; p++) |
| 95 | { |
| 96 | lex[(unsigned char) *p] = LEX_IS_LINE_COMMENT_START; |
| 97 | } /* declare line comment chars */ |
| 98 | |
| 99 | for (p = line_separator_chars; *p; p++) |
| 100 | { |
| 101 | lex[(unsigned char) *p] = LEX_IS_LINE_SEPARATOR; |
| 102 | } /* declare line separators */ |
| 103 | |
| 104 | /* Only allow slash-star comments if slash is not in use */ |
| 105 | if (lex['/'] == 0) |
| 106 | { |
| 107 | lex['/'] = LEX_IS_TWOCHAR_COMMENT_1ST; |
| 108 | } |
| 109 | /* FIXME-soon. This is a bad hack but otherwise, we |
| 110 | can't do c-style comments when '/' is a line |
| 111 | comment char. xoxorich. */ |
| 112 | if (lex['*'] == 0) |
| 113 | { |
| 114 | lex['*'] = LEX_IS_TWOCHAR_COMMENT_2ND; |
| 115 | } |
| 116 | } /* do_scrub_begin() */ |
| 117 | |
| 118 | FILE *scrub_file; |
| 119 | |
| 120 | int |
| 121 | scrub_from_file () |
| 122 | { |
| 123 | return getc (scrub_file); |
| 124 | } |
| 125 | |
| 126 | void |
| 127 | scrub_to_file (ch) |
| 128 | int ch; |
| 129 | { |
| 130 | ungetc (ch, scrub_file); |
| 131 | } /* scrub_to_file() */ |
| 132 | |
| 133 | char *scrub_string; |
| 134 | char *scrub_last_string; |
| 135 | |
| 136 | int |
| 137 | scrub_from_string () |
| 138 | { |
| 139 | return scrub_string == scrub_last_string ? EOF : *scrub_string++; |
| 140 | } /* scrub_from_string() */ |
| 141 | |
| 142 | void |
| 143 | scrub_to_string (ch) |
| 144 | int ch; |
| 145 | { |
| 146 | *--scrub_string = ch; |
| 147 | } /* scrub_to_string() */ |
| 148 | |
| 149 | /* Saved state of the scrubber */ |
| 150 | static int state; |
| 151 | static int old_state; |
| 152 | static char *out_string; |
| 153 | static char out_buf[20]; |
| 154 | static int add_newlines = 0; |
| 155 | |
| 156 | /* Data structure for saving the state of app across #include's. Note that |
| 157 | app is called asynchronously to the parsing of the .include's, so our |
| 158 | state at the time .include is interpreted is completely unrelated. |
| 159 | That's why we have to save it all. */ |
| 160 | |
| 161 | struct app_save |
| 162 | { |
| 163 | int state; |
| 164 | int old_state; |
| 165 | char *out_string; |
| 166 | char out_buf[sizeof (out_buf)]; |
| 167 | int add_newlines; |
| 168 | char *scrub_string; |
| 169 | char *scrub_last_string; |
| 170 | FILE *scrub_file; |
| 171 | }; |
| 172 | |
| 173 | char * |
| 174 | app_push () |
| 175 | { |
| 176 | register struct app_save *saved; |
| 177 | |
| 178 | saved = (struct app_save *) xmalloc (sizeof (*saved)); |
| 179 | saved->state = state; |
| 180 | saved->old_state = old_state; |
| 181 | saved->out_string = out_string; |
| 182 | memcpy (saved->out_buf, out_buf, sizeof (out_buf)); |
| 183 | saved->add_newlines = add_newlines; |
| 184 | saved->scrub_string = scrub_string; |
| 185 | saved->scrub_last_string = scrub_last_string; |
| 186 | saved->scrub_file = scrub_file; |
| 187 | |
| 188 | /* do_scrub_begin() is not useful, just wastes time. */ |
| 189 | return (char *) saved; |
| 190 | } |
| 191 | |
| 192 | void |
| 193 | app_pop (arg) |
| 194 | char *arg; |
| 195 | { |
| 196 | register struct app_save *saved = (struct app_save *) arg; |
| 197 | |
| 198 | /* There is no do_scrub_end (). */ |
| 199 | state = saved->state; |
| 200 | old_state = saved->old_state; |
| 201 | out_string = saved->out_string; |
| 202 | memcpy (out_buf, saved->out_buf, sizeof (out_buf)); |
| 203 | add_newlines = saved->add_newlines; |
| 204 | scrub_string = saved->scrub_string; |
| 205 | scrub_last_string = saved->scrub_last_string; |
| 206 | scrub_file = saved->scrub_file; |
| 207 | |
| 208 | free (arg); |
| 209 | } /* app_pop() */ |
| 210 | |
| 211 | /* @@ This assumes that \n &c are the same on host and target. This is not |
| 212 | necessarily true. */ |
| 213 | int |
| 214 | process_escape (ch) |
| 215 | char ch; |
| 216 | { |
| 217 | switch (ch) |
| 218 | { |
| 219 | case 'b': |
| 220 | return '\b'; |
| 221 | case 'f': |
| 222 | return '\f'; |
| 223 | case 'n': |
| 224 | return '\n'; |
| 225 | case 'r': |
| 226 | return '\r'; |
| 227 | case 't': |
| 228 | return '\t'; |
| 229 | case '\'': |
| 230 | return '\''; |
| 231 | case '"': |
| 232 | return '\"'; |
| 233 | default: |
| 234 | return ch; |
| 235 | } |
| 236 | } |
| 237 | int |
| 238 | do_scrub_next_char (get, unget) |
| 239 | int (*get) (); |
| 240 | void (*unget) (); |
| 241 | { |
| 242 | /*State 0: beginning of normal line |
| 243 | 1: After first whitespace on line (flush more white) |
| 244 | 2: After first non-white (opcode) on line (keep 1white) |
| 245 | 3: after second white on line (into operands) (flush white) |
| 246 | 4: after putting out a .line, put out digits |
| 247 | 5: parsing a string, then go to old-state |
| 248 | 6: putting out \ escape in a "d string. |
| 249 | 7: After putting out a .appfile, put out string. |
| 250 | 8: After putting out a .appfile string, flush until newline. |
| 251 | 9: After seeing symbol char in state 3 (keep 1white after symchar) |
| 252 | 10: After seeing whitespace in state 9 (keep white before symchar) |
| 253 | -1: output string in out_string and go to the state in old_state |
| 254 | -2: flush text until a '*' '/' is seen, then go to state old_state |
| 255 | */ |
| 256 | |
| 257 | /* I added states 9 and 10 because the MIPS ECOFF assembler uses |
| 258 | constructs like ``.loc 1 20''. This was turning into ``.loc |
| 259 | 120''. States 9 and 10 ensure that a space is never dropped in |
| 260 | between characters which could appear in a identifier. Ian |
| 261 | Taylor, ian@cygnus.com. */ |
| 262 | |
| 263 | register int ch, ch2 = 0; |
| 264 | |
| 265 | switch (state) |
| 266 | { |
| 267 | case -1: |
| 268 | ch = *out_string++; |
| 269 | if (*out_string == 0) |
| 270 | { |
| 271 | state = old_state; |
| 272 | old_state = 3; |
| 273 | } |
| 274 | return ch; |
| 275 | |
| 276 | case -2: |
| 277 | for (;;) |
| 278 | { |
| 279 | do |
| 280 | { |
| 281 | ch = (*get) (); |
| 282 | } |
| 283 | while (ch != EOF && ch != '\n' && ch != '*'); |
| 284 | if (ch == '\n' || ch == EOF) |
| 285 | return ch; |
| 286 | |
| 287 | /* At this point, ch must be a '*' */ |
| 288 | while ((ch = (*get) ()) == '*') |
| 289 | { |
| 290 | ; |
| 291 | } |
| 292 | if (ch == EOF || ch == '/') |
| 293 | break; |
| 294 | (*unget) (ch); |
| 295 | } |
| 296 | state = old_state; |
| 297 | return ' '; |
| 298 | |
| 299 | case 4: |
| 300 | ch = (*get) (); |
| 301 | if (ch == EOF || (ch >= '0' && ch <= '9')) |
| 302 | return ch; |
| 303 | else |
| 304 | { |
| 305 | while (ch != EOF && IS_WHITESPACE (ch)) |
| 306 | ch = (*get) (); |
| 307 | if (ch == '"') |
| 308 | { |
| 309 | (*unget) (ch); |
| 310 | out_string = "\n.appfile "; |
| 311 | old_state = 7; |
| 312 | state = -1; |
| 313 | return *out_string++; |
| 314 | } |
| 315 | else |
| 316 | { |
| 317 | while (ch != EOF && ch != '\n') |
| 318 | ch = (*get) (); |
| 319 | state = 0; |
| 320 | return ch; |
| 321 | } |
| 322 | } |
| 323 | |
| 324 | case 5: |
| 325 | ch = (*get) (); |
| 326 | if (lex[ch] == LEX_IS_STRINGQUOTE) |
| 327 | { |
| 328 | state = old_state; |
| 329 | return ch; |
| 330 | } |
| 331 | else if (ch == '\\') |
| 332 | { |
| 333 | state = 6; |
| 334 | return ch; |
| 335 | } |
| 336 | else if (ch == EOF) |
| 337 | { |
| 338 | as_warn ("End of file in string: inserted '\"'"); |
| 339 | state = old_state; |
| 340 | (*unget) ('\n'); |
| 341 | return '"'; |
| 342 | } |
| 343 | else |
| 344 | { |
| 345 | return ch; |
| 346 | } |
| 347 | |
| 348 | case 6: |
| 349 | state = 5; |
| 350 | ch = (*get) (); |
| 351 | switch (ch) |
| 352 | { |
| 353 | /* Handle strings broken across lines, by turning '\n' into |
| 354 | '\\' and 'n'. */ |
| 355 | case '\n': |
| 356 | (*unget) ('n'); |
| 357 | add_newlines++; |
| 358 | return '\\'; |
| 359 | |
| 360 | case '"': |
| 361 | case '\\': |
| 362 | #ifdef TC_HPPA |
| 363 | case 'x': /* '\\x' introduces escaped sequences on the PA */ |
| 364 | #endif |
| 365 | case 'b': |
| 366 | case 'f': |
| 367 | case 'n': |
| 368 | case 'r': |
| 369 | case 't': |
| 370 | #ifdef BACKSLASH_V |
| 371 | case 'v': |
| 372 | #endif /* BACKSLASH_V */ |
| 373 | case '0': |
| 374 | case '1': |
| 375 | case '2': |
| 376 | case '3': |
| 377 | case '4': |
| 378 | case '5': |
| 379 | case '6': |
| 380 | case '7': |
| 381 | break; |
| 382 | #if defined(IGNORE_NONSTANDARD_ESCAPES) | defined(ONLY_STANDARD_ESCAPES) |
| 383 | default: |
| 384 | as_warn ("Unknown escape '\\%c' in string: Ignored", ch); |
| 385 | break; |
| 386 | #else /* ONLY_STANDARD_ESCAPES */ |
| 387 | default: |
| 388 | /* Accept \x as x for any x */ |
| 389 | break; |
| 390 | #endif /* ONLY_STANDARD_ESCAPES */ |
| 391 | |
| 392 | case EOF: |
| 393 | as_warn ("End of file in string: '\"' inserted"); |
| 394 | return '"'; |
| 395 | } |
| 396 | return ch; |
| 397 | |
| 398 | case 7: |
| 399 | ch = (*get) (); |
| 400 | state = 5; |
| 401 | old_state = 8; |
| 402 | return ch; |
| 403 | |
| 404 | case 8: |
| 405 | do |
| 406 | ch = (*get) (); |
| 407 | while (ch != '\n'); |
| 408 | state = 0; |
| 409 | return ch; |
| 410 | } |
| 411 | |
| 412 | /* OK, we are somewhere in states 0 through 4 or 9 through 10 */ |
| 413 | |
| 414 | /* flushchar: */ |
| 415 | ch = (*get) (); |
| 416 | recycle: |
| 417 | if (ch == EOF) |
| 418 | { |
| 419 | if (state != 0) |
| 420 | as_warn ("End of file not at end of a line: Newline inserted."); |
| 421 | return ch; |
| 422 | } |
| 423 | |
| 424 | switch (lex[ch]) |
| 425 | { |
| 426 | case LEX_IS_WHITESPACE: |
| 427 | do |
| 428 | ch = (*get) (); |
| 429 | while (ch != EOF && IS_WHITESPACE (ch)); |
| 430 | if (ch == EOF) |
| 431 | return ch; |
| 432 | |
| 433 | if (IS_COMMENT (ch) || (state == 0 && IS_LINE_COMMENT (ch)) || ch == '/' || IS_LINE_SEPARATOR (ch)) |
| 434 | { |
| 435 | goto recycle; |
| 436 | } |
| 437 | #ifdef MRI |
| 438 | (*unget) (ch); /* Put back */ |
| 439 | return ' '; /* Always return one space at start of line */ |
| 440 | #endif |
| 441 | |
| 442 | /* If we're in state 2, we've seen a non-white |
| 443 | character followed by whitespace. If the next |
| 444 | character is ':', this is whitespace after a label |
| 445 | name which we can ignore. */ |
| 446 | if (state == 2 && lex[ch] == LEX_IS_COLON) |
| 447 | { |
| 448 | state = 0; |
| 449 | return ch; |
| 450 | } |
| 451 | |
| 452 | switch (state) |
| 453 | { |
| 454 | case 0: |
| 455 | state++; |
| 456 | goto recycle; /* Punted leading sp */ |
| 457 | case 1: |
| 458 | BAD_CASE (state); /* We can't get here */ |
| 459 | case 2: |
| 460 | state = 3; |
| 461 | (*unget) (ch); |
| 462 | return ' '; /* Sp after opco */ |
| 463 | case 3: |
| 464 | goto recycle; /* Sp in operands */ |
| 465 | case 9: |
| 466 | case 10: |
| 467 | state = 10; /* Sp after symbol char */ |
| 468 | goto recycle; |
| 469 | default: |
| 470 | BAD_CASE (state); |
| 471 | } |
| 472 | break; |
| 473 | |
| 474 | case LEX_IS_TWOCHAR_COMMENT_1ST: |
| 475 | ch2 = (*get) (); |
| 476 | if (ch2 != EOF && lex[ch2] == LEX_IS_TWOCHAR_COMMENT_2ND) |
| 477 | { |
| 478 | for (;;) |
| 479 | { |
| 480 | do |
| 481 | { |
| 482 | ch2 = (*get) (); |
| 483 | if (ch2 != EOF && IS_NEWLINE (ch2)) |
| 484 | add_newlines++; |
| 485 | } |
| 486 | while (ch2 != EOF && |
| 487 | (lex[ch2] != LEX_IS_TWOCHAR_COMMENT_2ND)); |
| 488 | |
| 489 | while (ch2 != EOF && |
| 490 | (lex[ch2] == LEX_IS_TWOCHAR_COMMENT_2ND)) |
| 491 | { |
| 492 | ch2 = (*get) (); |
| 493 | } |
| 494 | |
| 495 | if (ch2 == EOF |
| 496 | || lex[ch2] == LEX_IS_TWOCHAR_COMMENT_1ST) |
| 497 | break; |
| 498 | (*unget) (ch); |
| 499 | } |
| 500 | if (ch2 == EOF) |
| 501 | as_warn ("End of file in multiline comment"); |
| 502 | |
| 503 | ch = ' '; |
| 504 | goto recycle; |
| 505 | } |
| 506 | else |
| 507 | { |
| 508 | if (ch2 != EOF) |
| 509 | (*unget) (ch2); |
| 510 | if (state == 9 || state == 10) |
| 511 | state = 3; |
| 512 | return ch; |
| 513 | } |
| 514 | break; |
| 515 | |
| 516 | case LEX_IS_STRINGQUOTE: |
| 517 | if (state == 9 || state == 10) |
| 518 | old_state = 3; |
| 519 | else |
| 520 | old_state = state; |
| 521 | state = 5; |
| 522 | return ch; |
| 523 | #ifndef MRI |
| 524 | #ifndef IEEE_STYLE |
| 525 | case LEX_IS_ONECHAR_QUOTE: |
| 526 | ch = (*get) (); |
| 527 | if (ch == EOF) |
| 528 | { |
| 529 | as_warn ("End-of-file after a one-character quote; \\000 inserted"); |
| 530 | ch = 0; |
| 531 | } |
| 532 | if (ch == '\\') |
| 533 | { |
| 534 | ch = (*get) (); |
| 535 | ch = process_escape (ch); |
| 536 | } |
| 537 | sprintf (out_buf, "%d", (int) (unsigned char) ch); |
| 538 | |
| 539 | |
| 540 | /* None of these 'x constants for us. We want 'x'. */ |
| 541 | if ((ch = (*get) ()) != '\'') |
| 542 | { |
| 543 | #ifdef REQUIRE_CHAR_CLOSE_QUOTE |
| 544 | as_warn ("Missing close quote: (assumed)"); |
| 545 | #else |
| 546 | (*unget) (ch); |
| 547 | #endif |
| 548 | } |
| 549 | if (strlen (out_buf) == 1) |
| 550 | { |
| 551 | return out_buf[0]; |
| 552 | } |
| 553 | if (state == 9 || state == 10) |
| 554 | old_state = 3; |
| 555 | else |
| 556 | old_state = state; |
| 557 | state = -1; |
| 558 | out_string = out_buf; |
| 559 | return *out_string++; |
| 560 | #endif |
| 561 | #endif |
| 562 | case LEX_IS_COLON: |
| 563 | if (state == 9 || state == 10) |
| 564 | state = 3; |
| 565 | else if (state != 3) |
| 566 | state = 0; |
| 567 | return ch; |
| 568 | |
| 569 | case LEX_IS_NEWLINE: |
| 570 | /* Roll out a bunch of newlines from inside comments, etc. */ |
| 571 | if (add_newlines) |
| 572 | { |
| 573 | --add_newlines; |
| 574 | (*unget) (ch); |
| 575 | } |
| 576 | /* fall thru into... */ |
| 577 | |
| 578 | case LEX_IS_LINE_SEPARATOR: |
| 579 | state = 0; |
| 580 | return ch; |
| 581 | |
| 582 | case LEX_IS_LINE_COMMENT_START: |
| 583 | if (state == 0) /* Only comment at start of line. */ |
| 584 | { |
| 585 | /* FIXME-someday: The two character comment stuff was badly |
| 586 | thought out. On i386, we want '/' as line comment start |
| 587 | AND we want C style comments. hence this hack. The |
| 588 | whole lexical process should be reworked. xoxorich. */ |
| 589 | if (ch == '/') |
| 590 | { |
| 591 | ch2 = (*get) (); |
| 592 | if (ch2 == '*') |
| 593 | { |
| 594 | state = -2; |
| 595 | return (do_scrub_next_char (get, unget)); |
| 596 | } |
| 597 | else |
| 598 | { |
| 599 | (*unget) (ch2); |
| 600 | } |
| 601 | } /* bad hack */ |
| 602 | |
| 603 | do |
| 604 | ch = (*get) (); |
| 605 | while (ch != EOF && IS_WHITESPACE (ch)); |
| 606 | if (ch == EOF) |
| 607 | { |
| 608 | as_warn ("EOF in comment: Newline inserted"); |
| 609 | return '\n'; |
| 610 | } |
| 611 | if (ch < '0' || ch > '9') |
| 612 | { |
| 613 | /* Non-numerics: Eat whole comment line */ |
| 614 | while (ch != EOF && !IS_NEWLINE (ch)) |
| 615 | ch = (*get) (); |
| 616 | if (ch == EOF) |
| 617 | as_warn ("EOF in Comment: Newline inserted"); |
| 618 | state = 0; |
| 619 | return '\n'; |
| 620 | } |
| 621 | /* Numerics begin comment. Perhaps CPP `# 123 "filename"' */ |
| 622 | (*unget) (ch); |
| 623 | old_state = 4; |
| 624 | state = -1; |
| 625 | out_string = ".appline "; |
| 626 | return *out_string++; |
| 627 | } |
| 628 | |
| 629 | /* We have a line comment character which is not at the start of |
| 630 | a line. If this is also a normal comment character, fall |
| 631 | through. Otherwise treat it as a default character. */ |
| 632 | if (strchr (comment_chars, ch) == NULL) |
| 633 | goto de_fault; |
| 634 | /* Fall through. */ |
| 635 | case LEX_IS_COMMENT_START: |
| 636 | do |
| 637 | ch = (*get) (); |
| 638 | while (ch != EOF && !IS_NEWLINE (ch)); |
| 639 | if (ch == EOF) |
| 640 | as_warn ("EOF in comment: Newline inserted"); |
| 641 | state = 0; |
| 642 | return '\n'; |
| 643 | |
| 644 | case LEX_IS_SYMBOL_COMPONENT: |
| 645 | if (state == 10) |
| 646 | { |
| 647 | /* This is a symbol character following another symbol |
| 648 | character, with whitespace in between. We skipped the |
| 649 | whitespace earlier, so output it now. */ |
| 650 | (*unget) (ch); |
| 651 | state = 3; |
| 652 | return ' '; |
| 653 | } |
| 654 | if (state == 3) |
| 655 | state = 9; |
| 656 | /* Fall through. */ |
| 657 | default: |
| 658 | de_fault: |
| 659 | /* Some relatively `normal' character. */ |
| 660 | if (state == 0) |
| 661 | { |
| 662 | state = 2; /* Now seeing opcode */ |
| 663 | return ch; |
| 664 | } |
| 665 | else if (state == 1) |
| 666 | { |
| 667 | state = 2; /* Ditto */ |
| 668 | return ch; |
| 669 | } |
| 670 | else if (state == 9) |
| 671 | { |
| 672 | if (lex[ch] != LEX_IS_SYMBOL_COMPONENT) |
| 673 | state = 3; |
| 674 | return ch; |
| 675 | } |
| 676 | else if (state == 10) |
| 677 | { |
| 678 | state = 3; |
| 679 | return ch; |
| 680 | } |
| 681 | else |
| 682 | { |
| 683 | return ch; /* Opcode or operands already */ |
| 684 | } |
| 685 | } |
| 686 | return -1; |
| 687 | } |
| 688 | |
| 689 | #ifdef TEST |
| 690 | |
| 691 | const char comment_chars[] = "|"; |
| 692 | const char line_comment_chars[] = "#"; |
| 693 | |
| 694 | main () |
| 695 | { |
| 696 | int ch; |
| 697 | |
| 698 | app_begin (); |
| 699 | while ((ch = do_scrub_next_char (stdin)) != EOF) |
| 700 | putc (ch, stdout); |
| 701 | } |
| 702 | |
| 703 | as_warn (str) |
| 704 | char *str; |
| 705 | { |
| 706 | fputs (str, stderr); |
| 707 | putc ('\n', stderr); |
| 708 | } |
| 709 | |
| 710 | #endif |
| 711 | |
| 712 | /* end of app.c */ |