gas/macro.c

   1 /* macro.c - macro support for gas
   2    Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   3    2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   4
   5    Written by Steve and Judy Chamberlain of Cygnus Support,
   6       sac@cygnus.com
   7
   8    This file is part of GAS, the GNU Assembler.
   9
  10    GAS is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3, or (at your option)
  13    any later version.
  14
  15    GAS is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with GAS; see the file COPYING.  If not, write to the Free
  22    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  23    02110-1301, USA.  */
  24
  25 #include "as.h"
  26 #include "safe-ctype.h"
  27 #include "sb.h"
  28 #include "macro.h"
  29
  30 /* The routines in this file handle macro definition and expansion.
  31    They are called by gas.  */
  32
  33 #define ISWHITE(x) ((x) == ' ' || (x) == '\t')
  34
  35 #define ISSEP(x) \
  36  ((x) == ' ' || (x) == '\t' || (x) == ',' || (x) == '"' || (x) == ';' \
  37   || (x) == ')' || (x) == '(' \
  38   || ((macro_alternate || macro_mri) && ((x) == '<' || (x) == '>')))
  39
  40 #define ISBASE(x) \
  41   ((x) == 'b' || (x) == 'B' \
  42    || (x) == 'q' || (x) == 'Q' \
  43    || (x) == 'h' || (x) == 'H' \
  44    || (x) == 'd' || (x) == 'D')
  45
  46 /* The macro hash table.  */
  47
  48 struct hash_control *macro_hash;
  49
  50 /* Whether any macros have been defined.  */
  51
  52 int macro_defined;
  53
  54 /* Whether we are in alternate syntax mode.  */
  55
  56 static int macro_alternate;
  57
  58 /* Whether we are in MRI mode.  */
  59
  60 static int macro_mri;
  61
  62 /* Whether we should strip '@' characters.  */
  63
  64 static int macro_strip_at;
  65
  66 /* Function to use to parse an expression.  */
  67
  68 static int (*macro_expr) (const char *, int, sb *, int *);
  69
  70 /* Number of macro expansions that have been done.  */
  71
  72 static int macro_number;
  73
  74 /* Initialize macro processing.  */
  75
  76 void
  77 macro_init (int alternate, int mri, int strip_at,
  78             int (*expr) (const char *, int, sb *, int *))
  79 {
  80   macro_hash = hash_new ();
  81   macro_defined = 0;
  82   macro_alternate = alternate;
  83   macro_mri = mri;
  84   macro_strip_at = strip_at;
  85   macro_expr = expr;
  86 }
  87
  88 /* Switch in and out of alternate mode on the fly.  */
  89
  90 void
  91 macro_set_alternate (int alternate)
  92 {
  93   macro_alternate = alternate;
  94 }
  95
  96 /* Switch in and out of MRI mode on the fly.  */
  97
  98 void
  99 macro_mri_mode (int mri)
 100 {
 101   macro_mri = mri;
 102 }
 103
 104 /* Read input lines till we get to a TO string.
 105    Increase nesting depth if we get a FROM string.
 106    Put the results into sb at PTR.
 107    FROM may be NULL (or will be ignored) if TO is "ENDR".
 108    Add a new input line to an sb using GET_LINE.
 109    Return 1 on success, 0 on unexpected EOF.  */
 110
 111 int
 112 buffer_and_nest (const char *from, const char *to, sb *ptr,
 113                  int (*get_line) (sb *))
 114 {
 115   int from_len;
 116   int to_len = strlen (to);
 117   int depth = 1;
 118   int line_start = ptr->len;
 119
 120   int more = get_line (ptr);
 121
 122   if (to_len == 4 && strcasecmp(to, "ENDR") == 0)
 123     {
 124       from = NULL;
 125       from_len = 0;
 126     }
 127   else
 128     from_len = strlen (from);
 129
 130   while (more)
 131     {
 132       /* Try to find the first pseudo op on the line.  */
 133       int i = line_start;
 134       bfd_boolean had_colon = FALSE;
 135
 136       /* With normal syntax we can suck what we want till we get
 137          to the dot.  With the alternate, labels have to start in
 138          the first column, since we can't tell what's a label and
 139          what's a pseudoop.  */
 140
 141       if (! LABELS_WITHOUT_COLONS)
 142         {
 143           /* Skip leading whitespace.  */
 144           while (i < ptr->len && ISWHITE (ptr->ptr[i]))
 145             i++;
 146         }
 147
 148       for (;;)
 149         {
 150           /* Skip over a label, if any.  */
 151           if (i >= ptr->len || ! is_name_beginner (ptr->ptr[i]))
 152             break;
 153           i++;
 154           while (i < ptr->len && is_part_of_name (ptr->ptr[i]))
 155             i++;
 156           if (i < ptr->len && is_name_ender (ptr->ptr[i]))
 157             i++;
 158           /* Skip whitespace.  */
 159           while (i < ptr->len && ISWHITE (ptr->ptr[i]))
 160             i++;
 161           /* Check for the colon.  */
 162           if (i >= ptr->len || ptr->ptr[i] != ':')
 163             {
 164               /* LABELS_WITHOUT_COLONS doesn't mean we cannot have a
 165                  colon after a label.  If we do have a colon on the
 166                  first label then handle more than one label on the
 167                  line, assuming that each label has a colon.  */
 168               if (LABELS_WITHOUT_COLONS && !had_colon)
 169                 break;
 170               i = line_start;
 171               break;
 172             }
 173           i++;
 174           line_start = i;
 175           had_colon = TRUE;
 176         }
 177
 178       /* Skip trailing whitespace.  */
 179       while (i < ptr->len && ISWHITE (ptr->ptr[i]))
 180         i++;
 181
 182       if (i < ptr->len && (ptr->ptr[i] == '.'
 183                            || NO_PSEUDO_DOT
 184                            || macro_mri))
 185         {
 186           if (! flag_m68k_mri && ptr->ptr[i] == '.')
 187             i++;
 188           if (from == NULL
 189              && strncasecmp (ptr->ptr + i, "IRPC", from_len = 4) != 0
 190              && strncasecmp (ptr->ptr + i, "IRP", from_len = 3) != 0
 191              && strncasecmp (ptr->ptr + i, "IREPC", from_len = 5) != 0
 192              && strncasecmp (ptr->ptr + i, "IREP", from_len = 4) != 0
 193              && strncasecmp (ptr->ptr + i, "REPT", from_len = 4) != 0
 194              && strncasecmp (ptr->ptr + i, "REP", from_len = 3) != 0)
 195             from_len = 0;
 196           if ((from != NULL
 197                ? strncasecmp (ptr->ptr + i, from, from_len) == 0
 198                : from_len > 0)
 199               && (ptr->len == (i + from_len)
 200                   || ! (is_part_of_name (ptr->ptr[i + from_len])
 201                         || is_name_ender (ptr->ptr[i + from_len]))))
 202             depth++;
 203           if (strncasecmp (ptr->ptr + i, to, to_len) == 0
 204               && (ptr->len == (i + to_len)
 205                   || ! (is_part_of_name (ptr->ptr[i + to_len])
 206                         || is_name_ender (ptr->ptr[i + to_len]))))
 207             {
 208               depth--;
 209               if (depth == 0)
 210                 {
 211                   /* Reset the string to not include the ending rune.  */
 212                   ptr->len = line_start;
 213                   break;
 214                 }
 215             }
 216         }
 217
 218       /* Add the original end-of-line char to the end and keep running.  */
 219       sb_add_char (ptr, more);
 220       line_start = ptr->len;
 221       more = get_line (ptr);
 222     }
 223
 224   /* Return 1 on success, 0 on unexpected EOF.  */
 225   return depth == 0;
 226 }
 227
 228 /* Pick up a token.  */
 229
 230 static int
 231 get_token (int idx, sb *in, sb *name)
 232 {
 233   if (idx < in->len
 234       && is_name_beginner (in->ptr[idx]))
 235     {
 236       sb_add_char (name, in->ptr[idx++]);
 237       while (idx < in->len
 238              && is_part_of_name (in->ptr[idx]))
 239         {
 240           sb_add_char (name, in->ptr[idx++]);
 241         }
 242       if (idx < in->len
 243              && is_name_ender (in->ptr[idx]))
 244         {
 245           sb_add_char (name, in->ptr[idx++]);
 246         }
 247     }
 248   /* Ignore trailing &.  */
 249   if (macro_alternate && idx < in->len && in->ptr[idx] == '&')
 250     idx++;
 251   return idx;
 252 }
 253
 254 /* Pick up a string.  */
 255
 256 static int
 257 getstring (int idx, sb *in, sb *acc)
 258 {
 259   while (idx < in->len
 260          && (in->ptr[idx] == '"'
 261              || (in->ptr[idx] == '<' && (macro_alternate || macro_mri))
 262              || (in->ptr[idx] == '\'' && macro_alternate)))
 263     {
 264       if (in->ptr[idx] == '<')
 265         {
 266           int nest = 0;
 267           idx++;
 268           while ((in->ptr[idx] != '>' || nest)
 269                  && idx < in->len)
 270             {
 271               if (in->ptr[idx] == '!')
 272                 {
 273                   idx++;
 274                   sb_add_char (acc, in->ptr[idx++]);
 275                 }
 276               else
 277                 {
 278                   if (in->ptr[idx] == '>')
 279                     nest--;
 280                   if (in->ptr[idx] == '<')
 281                     nest++;
 282                   sb_add_char (acc, in->ptr[idx++]);
 283                 }
 284             }
 285           idx++;
 286         }
 287       else if (in->ptr[idx] == '"' || in->ptr[idx] == '\'')
 288         {
 289           char tchar = in->ptr[idx];
 290           int escaped = 0;
 291
 292           idx++;
 293
 294           while (idx < in->len)
 295             {
 296               if (in->ptr[idx - 1] == '\\')
 297                 escaped ^= 1;
 298               else
 299                 escaped = 0;
 300
 301               if (macro_alternate && in->ptr[idx] == '!')
 302                 {
 303                   idx ++;
 304
 305                   sb_add_char (acc, in->ptr[idx]);
 306
 307                   idx ++;
 308                 }
 309               else if (escaped && in->ptr[idx] == tchar)
 310                 {
 311                   sb_add_char (acc, tchar);
 312                   idx ++;
 313                 }
 314               else
 315                 {
 316                   if (in->ptr[idx] == tchar)
 317                     {
 318                       idx ++;
 319
 320                       if (idx >= in->len || in->ptr[idx] != tchar)
 321                         break;
 322                     }
 323
 324                   sb_add_char (acc, in->ptr[idx]);
 325                   idx ++;
 326                 }
 327             }
 328         }
 329     }
 330
 331   return idx;
 332 }
 333
 334 /* Fetch string from the input stream,
 335    rules:
 336     'Bxyx<whitespace>   -> return 'Bxyza
 337     %<expr>             -> return string of decimal value of <expr>
 338     "string"            -> return string
 339     (string)            -> return (string-including-whitespaces)
 340     xyx<whitespace>     -> return xyz.  */
 341
 342 static int
 343 get_any_string (int idx, sb *in, sb *out)
 344 {
 345   sb_reset (out);
 346   idx = sb_skip_white (idx, in);
 347
 348   if (idx < in->len)
 349     {
 350       if (in->len > idx + 2 && in->ptr[idx + 1] == '\'' && ISBASE (in->ptr[idx]))
 351         {
 352           while (!ISSEP (in->ptr[idx]))
 353             sb_add_char (out, in->ptr[idx++]);
 354         }
 355       else if (in->ptr[idx] == '%' && macro_alternate)
 356         {
 357           int val;
 358           char buf[20];
 359
 360           /* Turns the next expression into a string.  */
 361           /* xgettext: no-c-format */
 362           idx = (*macro_expr) (_("% operator needs absolute expression"),
 363                                idx + 1,
 364                                in,
 365                                &val);
 366           sprintf (buf, "%d", val);
 367           sb_add_string (out, buf);
 368         }
 369       else if (in->ptr[idx] == '"'
 370                || (in->ptr[idx] == '<' && (macro_alternate || macro_mri))
 371                || (macro_alternate && in->ptr[idx] == '\''))
 372         {
 373           if (macro_alternate && ! macro_strip_at && in->ptr[idx] != '<')
 374             {
 375               /* Keep the quotes.  */
 376               sb_add_char (out, '"');
 377               idx = getstring (idx, in, out);
 378               sb_add_char (out, '"');
 379             }
 380           else
 381             {
 382               idx = getstring (idx, in, out);
 383             }
 384         }
 385       else
 386         {
 387           char *br_buf = (char *) xmalloc(1);
 388           char *in_br = br_buf;
 389
 390           *in_br = '\0';
 391           while (idx < in->len
 392                  && (*in_br
 393                      || (in->ptr[idx] != ' '
 394                          && in->ptr[idx] != '\t'))
 395                  && in->ptr[idx] != ','
 396                  && (in->ptr[idx] != '<'
 397                      || (! macro_alternate && ! macro_mri)))
 398             {
 399               char tchar = in->ptr[idx];
 400
 401               switch (tchar)
 402                 {
 403                 case '"':
 404                 case '\'':
 405                   sb_add_char (out, in->ptr[idx++]);
 406                   while (idx < in->len
 407                          && in->ptr[idx] != tchar)
 408                     sb_add_char (out, in->ptr[idx++]);
 409                   if (idx == in->len)
 410                     return idx;
 411                   break;
 412                 case '(':
 413                 case '[':
 414                   if (in_br > br_buf)
 415                     --in_br;
 416                   else
 417                     {
 418                       br_buf = (char *) xmalloc(strlen(in_br) + 2);
 419                       strcpy(br_buf + 1, in_br);
 420                       free(in_br);
 421                       in_br = br_buf;
 422                     }
 423                   *in_br = tchar;
 424                   break;
 425                 case ')':
 426                   if (*in_br == '(')
 427                     ++in_br;
 428                   break;
 429                 case ']':
 430                   if (*in_br == '[')
 431                     ++in_br;
 432                   break;
 433                 }
 434               sb_add_char (out, tchar);
 435               ++idx;
 436             }
 437           free(br_buf);
 438         }
 439     }
 440
 441   return idx;
 442 }
 443
 444 /* Allocate a new formal.  */
 445
 446 static formal_entry *
 447 new_formal (void)
 448 {
 449   formal_entry *formal;
 450
 451   formal = (formal_entry *) xmalloc (sizeof (formal_entry));
 452
 453   sb_new (&formal->name);
 454   sb_new (&formal->def);
 455   sb_new (&formal->actual);
 456   formal->next = NULL;
 457   formal->type = FORMAL_OPTIONAL;
 458   return formal;
 459 }
 460
 461 /* Free a formal.  */
 462
 463 static void
 464 del_formal (formal_entry *formal)
 465 {
 466   sb_kill (&formal->actual);
 467   sb_kill (&formal->def);
 468   sb_kill (&formal->name);
 469   free (formal);
 470 }
 471
 472 /* Pick up the formal parameters of a macro definition.  */
 473
 474 static int
 475 do_formals (macro_entry *macro, int idx, sb *in)
 476 {
 477   formal_entry **p = &macro->formals;
 478   const char *name;
 479
 480   idx = sb_skip_white (idx, in);
 481   while (idx < in->len)
 482     {
 483       formal_entry *formal = new_formal ();
 484       int cidx;
 485
 486       idx = get_token (idx, in, &formal->name);
 487       if (formal->name.len == 0)
 488         {
 489           if (macro->formal_count)
 490             --idx;
 491           break;
 492         }
 493       idx = sb_skip_white (idx, in);
 494       /* This is a formal.  */
 495       name = sb_terminate (&formal->name);
 496       if (! macro_mri
 497           && idx < in->len
 498           && in->ptr[idx] == ':'
 499           && (! is_name_beginner (':')
 500               || idx + 1 >= in->len
 501               || ! is_part_of_name (in->ptr[idx + 1])))
 502         {
 503           /* Got a qualifier.  */
 504           sb qual;
 505
 506           sb_new (&qual);
 507           idx = get_token (sb_skip_white (idx + 1, in), in, &qual);
 508           sb_terminate (&qual);
 509           if (qual.len == 0)
 510             as_bad_where (macro->file,
 511                           macro->line,
 512                           _("Missing parameter qualifier for `%s' in macro `%s'"),
 513                           name,
 514                           macro->name);
 515           else if (strcmp (qual.ptr, "req") == 0)
 516             formal->type = FORMAL_REQUIRED;
 517           else if (strcmp (qual.ptr, "vararg") == 0)
 518             formal->type = FORMAL_VARARG;
 519           else
 520             as_bad_where (macro->file,
 521                           macro->line,
 522                           _("`%s' is not a valid parameter qualifier for `%s' in macro `%s'"),
 523                           qual.ptr,
 524                           name,
 525                           macro->name);
 526           sb_kill (&qual);
 527           idx = sb_skip_white (idx, in);
 528         }
 529       if (idx < in->len && in->ptr[idx] == '=')
 530         {
 531           /* Got a default.  */
 532           idx = get_any_string (idx + 1, in, &formal->def);
 533           idx = sb_skip_white (idx, in);
 534           if (formal->type == FORMAL_REQUIRED)
 535             {
 536               sb_reset (&formal->def);
 537               as_warn_where (macro->file,
 538                             macro->line,
 539                             _("Pointless default value for required parameter `%s' in macro `%s'"),
 540                             name,
 541                             macro->name);
 542             }
 543         }
 544
 545       /* Add to macro's hash table.  */
 546       if (! hash_find (macro->formal_hash, name))
 547         hash_jam (macro->formal_hash, name, formal);
 548       else
 549         as_bad_where (macro->file,
 550                       macro->line,
 551                       _("A parameter named `%s' already exists for macro `%s'"),
 552                       name,
 553                       macro->name);
 554
 555       formal->index = macro->formal_count++;
 556       *p = formal;
 557       p = &formal->next;
 558       if (formal->type == FORMAL_VARARG)
 559         break;
 560       cidx = idx;
 561       idx = sb_skip_comma (idx, in);
 562       if (idx != cidx && idx >= in->len)
 563         {
 564           idx = cidx;
 565           break;
 566         }
 567     }
 568
 569   if (macro_mri)
 570     {
 571       formal_entry *formal = new_formal ();
 572
 573       /* Add a special NARG formal, which macro_expand will set to the
 574          number of arguments.  */
 575       /* The same MRI assemblers which treat '@' characters also use
 576          the name $NARG.  At least until we find an exception.  */
 577       if (macro_strip_at)
 578         name = "$NARG";
 579       else
 580         name = "NARG";
 581
 582       sb_add_string (&formal->name, name);
 583
 584       /* Add to macro's hash table.  */
 585       if (hash_find (macro->formal_hash, name))
 586         as_bad_where (macro->file,
 587                       macro->line,
 588                       _("Reserved word `%s' used as parameter in macro `%s'"),
 589                       name,
 590                       macro->name);
 591       hash_jam (macro->formal_hash, name, formal);
 592
 593       formal->index = NARG_INDEX;
 594       *p = formal;
 595     }
 596
 597   return idx;
 598 }
 599
 600 /* Free the memory allocated to a macro.  */
 601
 602 static void
 603 free_macro (macro_entry *macro)
 604 {
 605   formal_entry *formal;
 606
 607   for (formal = macro->formals; formal; )
 608     {
 609       formal_entry *f;
 610
 611       f = formal;
 612       formal = formal->next;
 613       del_formal (f);
 614     }
 615   hash_die (macro->formal_hash);
 616   sb_kill (&macro->sub);
 617   free (macro);
 618 }
 619
 620 /* Define a new macro.  Returns NULL on success, otherwise returns an
 621    error message.  If NAMEP is not NULL, *NAMEP is set to the name of
 622    the macro which was defined.  */
 623
 624 const char *
 625 define_macro (int idx, sb *in, sb *label,
 626               int (*get_line) (sb *),
 627               char *file, unsigned int line,
 628               const char **namep)
 629 {
 630   macro_entry *macro;
 631   sb name;
 632   const char *error = NULL;
 633
 634   macro = (macro_entry *) xmalloc (sizeof (macro_entry));
 635   sb_new (&macro->sub);
 636   sb_new (&name);
 637   macro->file = file;
 638   macro->line = line;
 639
 640   macro->formal_count = 0;
 641   macro->formals = 0;
 642   macro->formal_hash = hash_new ();
 643
 644   idx = sb_skip_white (idx, in);
 645   if (! buffer_and_nest ("MACRO", "ENDM", &macro->sub, get_line))
 646     error = _("unexpected end of file in macro `%s' definition");
 647   if (label != NULL && label->len != 0)
 648     {
 649       sb_add_sb (&name, label);
 650       macro->name = sb_terminate (&name);
 651       if (idx < in->len && in->ptr[idx] == '(')
 652         {
 653           /* It's the label: MACRO (formals,...)  sort  */
 654           idx = do_formals (macro, idx + 1, in);
 655           if (idx < in->len && in->ptr[idx] == ')')
 656             idx = sb_skip_white (idx + 1, in);
 657           else if (!error)
 658             error = _("missing `)' after formals in macro definition `%s'");
 659         }
 660       else
 661         {
 662           /* It's the label: MACRO formals,...  sort  */
 663           idx = do_formals (macro, idx, in);
 664         }
 665     }
 666   else
 667     {
 668       int cidx;
 669
 670       idx = get_token (idx, in, &name);
 671       macro->name = sb_terminate (&name);
 672       if (name.len == 0)
 673         error = _("Missing macro name");
 674       cidx = sb_skip_white (idx, in);
 675       idx = sb_skip_comma (cidx, in);
 676       if (idx == cidx || idx < in->len)
 677         idx = do_formals (macro, idx, in);
 678       else
 679         idx = cidx;
 680     }
 681   if (!error && idx < in->len)
 682     error = _("Bad parameter list for macro `%s'");
 683
 684   /* And stick it in the macro hash table.  */
 685   for (idx = 0; idx < name.len; idx++)
 686     name.ptr[idx] = TOLOWER (name.ptr[idx]);
 687   if (hash_find (macro_hash, macro->name))
 688     error = _("Macro `%s' was already defined");
 689   if (!error)
 690     error = hash_jam (macro_hash, macro->name, (void *) macro);
 691
 692   if (namep != NULL)
 693     *namep = macro->name;
 694
 695   if (!error)
 696     macro_defined = 1;
 697   else
 698     free_macro (macro);
 699
 700   return error;
 701 }
 702
 703 /* Scan a token, and then skip KIND.  */
 704
 705 static int
 706 get_apost_token (int idx, sb *in, sb *name, int kind)
 707 {
 708   idx = get_token (idx, in, name);
 709   if (idx < in->len
 710       && in->ptr[idx] == kind
 711       && (! macro_mri || macro_strip_at)
 712       && (! macro_strip_at || kind == '@'))
 713     idx++;
 714   return idx;
 715 }
 716
 717 /* Substitute the actual value for a formal parameter.  */
 718
 719 static int
 720 sub_actual (int start, sb *in, sb *t, struct hash_control *formal_hash,
 721             int kind, sb *out, int copyifnotthere)
 722 {
 723   int src;
 724   formal_entry *ptr;
 725
 726   src = get_apost_token (start, in, t, kind);
 727   /* See if it's in the macro's hash table, unless this is
 728      macro_strip_at and kind is '@' and the token did not end in '@'.  */
 729   if (macro_strip_at
 730       && kind == '@'
 731       && (src == start || in->ptr[src - 1] != '@'))
 732     ptr = NULL;
 733   else
 734     ptr = (formal_entry *) hash_find (formal_hash, sb_terminate (t));
 735   if (ptr)
 736     {
 737       if (ptr->actual.len)
 738         {
 739           sb_add_sb (out, &ptr->actual);
 740         }
 741       else
 742         {
 743           sb_add_sb (out, &ptr->def);
 744         }
 745     }
 746   else if (kind == '&')
 747     {
 748       /* Doing this permits people to use & in macro bodies.  */
 749       sb_add_char (out, '&');
 750       sb_add_sb (out, t);
 751     }
 752   else if (copyifnotthere)
 753     {
 754       sb_add_sb (out, t);
 755     }
 756   else
 757     {
 758       sb_add_char (out, '\\');
 759       sb_add_sb (out, t);
 760     }
 761   return src;
 762 }
 763
 764 /* Expand the body of a macro.  */
 765
 766 static const char *
 767 macro_expand_body (sb *in, sb *out, formal_entry *formals,
 768                    struct hash_control *formal_hash, const macro_entry *macro)
 769 {
 770   sb t;
 771   int src = 0, inquote = 0, macro_line = 0;
 772   formal_entry *loclist = NULL;
 773   const char *err = NULL;
 774
 775   sb_new (&t);
 776
 777   while (src < in->len && !err)
 778     {
 779       if (in->ptr[src] == '&')
 780         {
 781           sb_reset (&t);
 782           if (macro_mri)
 783             {
 784               if (src + 1 < in->len && in->ptr[src + 1] == '&')
 785                 src = sub_actual (src + 2, in, &t, formal_hash, '\'', out, 1);
 786               else
 787                 sb_add_char (out, in->ptr[src++]);
 788             }
 789           else
 790             {
 791               /* FIXME: Why do we do this?  */
 792               /* At least in alternate mode this seems correct; without this
 793                  one can't append a literal to a parameter.  */
 794               src = sub_actual (src + 1, in, &t, formal_hash, '&', out, 0);
 795             }
 796         }
 797       else if (in->ptr[src] == '\\')
 798         {
 799           src++;
 800           if (src < in->len && in->ptr[src] == '(')
 801             {
 802               /* Sub in till the next ')' literally.  */
 803               src++;
 804               while (src < in->len && in->ptr[src] != ')')
 805                 {
 806                   sb_add_char (out, in->ptr[src++]);
 807                 }
 808               if (src < in->len)
 809                 src++;
 810               else if (!macro)
 811                 err = _("missing `)'");
 812               else
 813                 as_bad_where (macro->file, macro->line + macro_line, _("missing `)'"));
 814             }
 815           else if (src < in->len && in->ptr[src] == '@')
 816             {
 817               /* Sub in the macro invocation number.  */
 818
 819               char buffer[10];
 820               src++;
 821               sprintf (buffer, "%d", macro_number);
 822               sb_add_string (out, buffer);
 823             }
 824           else if (src < in->len && in->ptr[src] == '&')
 825             {
 826               /* This is a preprocessor variable name, we don't do them
 827                  here.  */
 828               sb_add_char (out, '\\');
 829               sb_add_char (out, '&');
 830               src++;
 831             }
 832           else if (macro_mri && src < in->len && ISALNUM (in->ptr[src]))
 833             {
 834               int ind;
 835               formal_entry *f;
 836
 837               if (ISDIGIT (in->ptr[src]))
 838                 ind = in->ptr[src] - '0';
 839               else if (ISUPPER (in->ptr[src]))
 840                 ind = in->ptr[src] - 'A' + 10;
 841               else
 842                 ind = in->ptr[src] - 'a' + 10;
 843               ++src;
 844               for (f = formals; f != NULL; f = f->next)
 845                 {
 846                   if (f->index == ind - 1)
 847                     {
 848                       if (f->actual.len != 0)
 849                         sb_add_sb (out, &f->actual);
 850                       else
 851                         sb_add_sb (out, &f->def);
 852                       break;
 853                     }
 854                 }
 855             }
 856           else
 857             {
 858               sb_reset (&t);
 859               src = sub_actual (src, in, &t, formal_hash, '\'', out, 0);
 860             }
 861         }
 862       else if ((macro_alternate || macro_mri)
 863                && is_name_beginner (in->ptr[src])
 864                && (! inquote
 865                    || ! macro_strip_at
 866                    || (src > 0 && in->ptr[src - 1] == '@')))
 867         {
 868           if (! macro
 869               || src + 5 >= in->len
 870               || strncasecmp (in->ptr + src, "LOCAL", 5) != 0
 871               || ! ISWHITE (in->ptr[src + 5]))
 872             {
 873               sb_reset (&t);
 874               src = sub_actual (src, in, &t, formal_hash,
 875                                 (macro_strip_at && inquote) ? '@' : '\'',
 876                                 out, 1);
 877             }
 878           else
 879             {
 880               src = sb_skip_white (src + 5, in);
 881               while (in->ptr[src] != '\n')
 882                 {
 883                   const char *name;
 884                   formal_entry *f = new_formal ();
 885
 886                   src = get_token (src, in, &f->name);
 887                   name = sb_terminate (&f->name);
 888                   if (! hash_find (formal_hash, name))
 889                     {
 890                       static int loccnt;
 891                       char buf[20];
 892
 893                       f->index = LOCAL_INDEX;
 894                       f->next = loclist;
 895                       loclist = f;
 896
 897                       sprintf (buf, IS_ELF ? ".LL%04x" : "LL%04x", ++loccnt);
 898                       sb_add_string (&f->actual, buf);
 899
 900                       err = hash_jam (formal_hash, name, f);
 901                       if (err != NULL)
 902                         break;
 903                     }
 904                   else
 905                     {
 906                       as_bad_where (macro->file,
 907                                     macro->line + macro_line,
 908                                     _("`%s' was already used as parameter (or another local) name"),
 909                                     name);
 910                       del_formal (f);
 911                     }
 912
 913                   src = sb_skip_comma (src, in);
 914                 }
 915             }
 916         }
 917       else if (in->ptr[src] == '"'
 918                || (macro_mri && in->ptr[src] == '\''))
 919         {
 920           inquote = !inquote;
 921           sb_add_char (out, in->ptr[src++]);
 922         }
 923       else if (in->ptr[src] == '@' && macro_strip_at)
 924         {
 925           ++src;
 926           if (src < in->len
 927               && in->ptr[src] == '@')
 928             {
 929               sb_add_char (out, '@');
 930               ++src;
 931             }
 932         }
 933       else if (macro_mri
 934                && in->ptr[src] == '='
 935                && src + 1 < in->len
 936                && in->ptr[src + 1] == '=')
 937         {
 938           formal_entry *ptr;
 939
 940           sb_reset (&t);
 941           src = get_token (src + 2, in, &t);
 942           ptr = (formal_entry *) hash_find (formal_hash, sb_terminate (&t));
 943           if (ptr == NULL)
 944             {
 945               /* FIXME: We should really return a warning string here,
 946                  but we can't, because the == might be in the MRI
 947                  comment field, and, since the nature of the MRI
 948                  comment field depends upon the exact instruction
 949                  being used, we don't have enough information here to
 950                  figure out whether it is or not.  Instead, we leave
 951                  the == in place, which should cause a syntax error if
 952                  it is not in a comment.  */
 953               sb_add_char (out, '=');
 954               sb_add_char (out, '=');
 955               sb_add_sb (out, &t);
 956             }
 957           else
 958             {
 959               if (ptr->actual.len)
 960                 {
 961                   sb_add_string (out, "-1");
 962                 }
 963               else
 964                 {
 965                   sb_add_char (out, '0');
 966                 }
 967             }
 968         }
 969       else
 970         {
 971           if (in->ptr[src] == '\n')
 972             ++macro_line;
 973           sb_add_char (out, in->ptr[src++]);
 974         }
 975     }
 976
 977   sb_kill (&t);
 978
 979   while (loclist != NULL)
 980     {
 981       formal_entry *f;
 982       const char *name;
 983
 984       f = loclist->next;
 985       name = sb_terminate (&loclist->name);
 986       hash_delete (formal_hash, name, f == NULL);
 987       del_formal (loclist);
 988       loclist = f;
 989     }
 990
 991   return err;
 992 }
 993
 994 /* Assign values to the formal parameters of a macro, and expand the
 995    body.  */
 996
 997 static const char *
 998 macro_expand (int idx, sb *in, macro_entry *m, sb *out)
 999 {
1000   sb t;
1001   formal_entry *ptr;
1002   formal_entry *f;
1003   int is_keyword = 0;
1004   int narg = 0;
1005   const char *err = NULL;
1006
1007   sb_new (&t);
1008
1009   /* Reset any old value the actuals may have.  */
1010   for (f = m->formals; f; f = f->next)
1011     sb_reset (&f->actual);
1012   f = m->formals;
1013   while (f != NULL && f->index < 0)
1014     f = f->next;
1015
1016   if (macro_mri)
1017     {
1018       /* The macro may be called with an optional qualifier, which may
1019          be referred to in the macro body as \0.  */
1020       if (idx < in->len && in->ptr[idx] == '.')
1021         {
1022           /* The Microtec assembler ignores this if followed by a white space.
1023              (Macro invocation with empty extension) */
1024           idx++;
1025           if (    idx < in->len
1026                   && in->ptr[idx] != ' '
1027                   && in->ptr[idx] != '\t')
1028             {
1029               formal_entry *n = new_formal ();
1030
1031               n->index = QUAL_INDEX;
1032
1033               n->next = m->formals;
1034               m->formals = n;
1035
1036               idx = get_any_string (idx, in, &n->actual);
1037             }
1038         }
1039     }
1040
1041   /* Peel off the actuals and store them away in the hash tables' actuals.  */
1042   idx = sb_skip_white (idx, in);
1043   while (idx < in->len)
1044     {
1045       int scan;
1046
1047       /* Look and see if it's a positional or keyword arg.  */
1048       scan = idx;
1049       while (scan < in->len
1050              && !ISSEP (in->ptr[scan])
1051              && !(macro_mri && in->ptr[scan] == '\'')
1052              && (!macro_alternate && in->ptr[scan] != '='))
1053         scan++;
1054       if (scan < in->len && !macro_alternate && in->ptr[scan] == '=')
1055         {
1056           is_keyword = 1;
1057
1058           /* It's OK to go from positional to keyword.  */
1059
1060           /* This is a keyword arg, fetch the formal name and
1061              then the actual stuff.  */
1062           sb_reset (&t);
1063           idx = get_token (idx, in, &t);
1064           if (in->ptr[idx] != '=')
1065             {
1066               err = _("confusion in formal parameters");
1067               break;
1068             }
1069
1070           /* Lookup the formal in the macro's list.  */
1071           ptr = (formal_entry *) hash_find (m->formal_hash, sb_terminate (&t));
1072           if (!ptr)
1073             as_bad (_("Parameter named `%s' does not exist for macro `%s'"),
1074                     t.ptr,
1075                     m->name);
1076           else
1077             {
1078               /* Insert this value into the right place.  */
1079               if (ptr->actual.len)
1080                 {
1081                   as_warn (_("Value for parameter `%s' of macro `%s' was already specified"),
1082                            ptr->name.ptr,
1083                            m->name);
1084                   sb_reset (&ptr->actual);
1085                 }
1086               idx = get_any_string (idx + 1, in, &ptr->actual);
1087               if (ptr->actual.len > 0)
1088                 ++narg;
1089             }
1090         }
1091       else
1092         {
1093           if (is_keyword)
1094             {
1095               err = _("can't mix positional and keyword arguments");
1096               break;
1097             }
1098
1099           if (!f)
1100             {
1101               formal_entry **pf;
1102               int c;
1103
1104               if (!macro_mri)
1105                 {
1106                   err = _("too many positional arguments");
1107                   break;
1108                 }
1109
1110               f = new_formal ();
1111
1112               c = -1;
1113               for (pf = &m->formals; *pf != NULL; pf = &(*pf)->next)
1114                 if ((*pf)->index >= c)
1115                   c = (*pf)->index + 1;
1116               if (c == -1)
1117                 c = 0;
1118               *pf = f;
1119               f->index = c;
1120             }
1121
1122           if (f->type != FORMAL_VARARG)
1123             idx = get_any_string (idx, in, &f->actual);
1124           else
1125             {
1126               sb_add_buffer (&f->actual, in->ptr + idx, in->len - idx);
1127               idx = in->len;
1128             }
1129           if (f->actual.len > 0)
1130             ++narg;
1131           do
1132             {
1133               f = f->next;
1134             }
1135           while (f != NULL && f->index < 0);
1136         }
1137
1138       if (! macro_mri)
1139         idx = sb_skip_comma (idx, in);
1140       else
1141         {
1142           if (in->ptr[idx] == ',')
1143             ++idx;
1144           if (ISWHITE (in->ptr[idx]))
1145             break;
1146         }
1147     }
1148
1149   if (! err)
1150     {
1151       for (ptr = m->formals; ptr; ptr = ptr->next)
1152         {
1153           if (ptr->type == FORMAL_REQUIRED && ptr->actual.len == 0)
1154             as_bad (_("Missing value for required parameter `%s' of macro `%s'"),
1155                     ptr->name.ptr,
1156                     m->name);
1157         }
1158
1159       if (macro_mri)
1160         {
1161           char buffer[20];
1162
1163           sb_reset (&t);
1164           sb_add_string (&t, macro_strip_at ? "$NARG" : "NARG");
1165           ptr = (formal_entry *) hash_find (m->formal_hash, sb_terminate (&t));
1166           sprintf (buffer, "%d", narg);
1167           sb_add_string (&ptr->actual, buffer);
1168         }
1169
1170       err = macro_expand_body (&m->sub, out, m->formals, m->formal_hash, m);
1171     }
1172
1173   /* Discard any unnamed formal arguments.  */
1174   if (macro_mri)
1175     {
1176       formal_entry **pf;
1177
1178       pf = &m->formals;
1179       while (*pf != NULL)
1180         {
1181           if ((*pf)->name.len != 0)
1182             pf = &(*pf)->next;
1183           else
1184             {
1185               f = (*pf)->next;
1186               del_formal (*pf);
1187               *pf = f;
1188             }
1189         }
1190     }
1191
1192   sb_kill (&t);
1193   if (!err)
1194     macro_number++;
1195
1196   return err;
1197 }
1198
1199 /* Check for a macro.  If one is found, put the expansion into
1200    *EXPAND.  Return 1 if a macro is found, 0 otherwise.  */
1201
1202 int
1203 check_macro (const char *line, sb *expand,
1204              const char **error, macro_entry **info)
1205 {
1206   const char *s;
1207   char *copy, *cs;
1208   macro_entry *macro;
1209   sb line_sb;
1210
1211   if (! is_name_beginner (*line)
1212       && (! macro_mri || *line != '.'))
1213     return 0;
1214
1215   s = line + 1;
1216   while (is_part_of_name (*s))
1217     ++s;
1218   if (is_name_ender (*s))
1219     ++s;
1220
1221   copy = (char *) alloca (s - line + 1);
1222   memcpy (copy, line, s - line);
1223   copy[s - line] = '\0';
1224   for (cs = copy; *cs != '\0'; cs++)
1225     *cs = TOLOWER (*cs);
1226
1227   macro = (macro_entry *) hash_find (macro_hash, copy);
1228
1229   if (macro == NULL)
1230     return 0;
1231
1232   /* Wrap the line up in an sb.  */
1233   sb_new (&line_sb);
1234   while (*s != '\0' && *s != '\n' && *s != '\r')
1235     sb_add_char (&line_sb, *s++);
1236
1237   sb_new (expand);
1238   *error = macro_expand (0, &line_sb, macro, expand);
1239
1240   sb_kill (&line_sb);
1241
1242   /* Export the macro information if requested.  */
1243   if (info)
1244     *info = macro;
1245
1246   return 1;
1247 }
1248
1249 /* Delete a macro.  */
1250
1251 void
1252 delete_macro (const char *name)
1253 {
1254   char *copy;
1255   size_t i, len;
1256   macro_entry *macro;
1257
1258   len = strlen (name);
1259   copy = (char *) alloca (len + 1);
1260   for (i = 0; i < len; ++i)
1261     copy[i] = TOLOWER (name[i]);
1262   copy[i] = '\0';
1263
1264   /* We can only ask hash_delete to free memory if we are deleting
1265      macros in reverse order to their definition.
1266      So just clear out the entry.  */
1267   if ((macro = (macro_entry *) hash_find (macro_hash, copy)) != NULL)
1268     {
1269       hash_jam (macro_hash, copy, NULL);
1270       free_macro (macro);
1271     }
1272   else
1273     as_warn (_("Attempt to purge non-existant macro `%s'"), copy);
1274 }
1275
1276 /* Handle the MRI IRP and IRPC pseudo-ops.  These are handled as a
1277    combined macro definition and execution.  This returns NULL on
1278    success, or an error message otherwise.  */
1279
1280 const char *
1281 expand_irp (int irpc, int idx, sb *in, sb *out, int (*get_line) (sb *))
1282 {
1283   sb sub;
1284   formal_entry f;
1285   struct hash_control *h;
1286   const char *err;
1287
1288   idx = sb_skip_white (idx, in);
1289
1290   sb_new (&sub);
1291   if (! buffer_and_nest (NULL, "ENDR", &sub, get_line))
1292     return _("unexpected end of file in irp or irpc");
1293
1294   sb_new (&f.name);
1295   sb_new (&f.def);
1296   sb_new (&f.actual);
1297
1298   idx = get_token (idx, in, &f.name);
1299   if (f.name.len == 0)
1300     return _("missing model parameter");
1301
1302   h = hash_new ();
1303   err = hash_jam (h, sb_terminate (&f.name), &f);
1304   if (err != NULL)
1305     return err;
1306
1307   f.index = 1;
1308   f.next = NULL;
1309   f.type = FORMAL_OPTIONAL;
1310
1311   sb_reset (out);
1312
1313   idx = sb_skip_comma (idx, in);
1314   if (idx >= in->len)
1315     {
1316       /* Expand once with a null string.  */
1317       err = macro_expand_body (&sub, out, &f, h, 0);
1318     }
1319   else
1320     {
1321       bfd_boolean in_quotes = FALSE;
1322
1323       if (irpc && in->ptr[idx] == '"')
1324         {
1325           in_quotes = TRUE;
1326           ++idx;
1327         }
1328
1329       while (idx < in->len)
1330         {
1331           if (!irpc)
1332             idx = get_any_string (idx, in, &f.actual);
1333           else
1334             {
1335               if (in->ptr[idx] == '"')
1336                 {
1337                   int nxt;
1338
1339                   if (irpc)
1340                     in_quotes = ! in_quotes;
1341
1342                   nxt = sb_skip_white (idx + 1, in);
1343                   if (nxt >= in->len)
1344                     {
1345                       idx = nxt;
1346                       break;
1347                     }
1348                 }
1349               sb_reset (&f.actual);
1350               sb_add_char (&f.actual, in->ptr[idx]);
1351               ++idx;
1352             }
1353
1354           err = macro_expand_body (&sub, out, &f, h, 0);
1355           if (err != NULL)
1356             break;
1357           if (!irpc)
1358             idx = sb_skip_comma (idx, in);
1359           else if (! in_quotes)
1360             idx = sb_skip_white (idx, in);
1361         }
1362     }
1363
1364   hash_die (h);
1365   sb_kill (&f.actual);
1366   sb_kill (&f.def);
1367   sb_kill (&f.name);
1368   sb_kill (&sub);
1369
1370   return err;
1371 }