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, 2011 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 (*exp) (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 = exp;
  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                     {
 411                       free (br_buf);
 412                       return idx;
 413                     }
 414                   break;
 415                 case '(':
 416                 case '[':
 417                   if (in_br > br_buf)
 418                     --in_br;
 419                   else
 420                     {
 421                       br_buf = (char *) xmalloc (strlen (in_br) + 2);
 422                       strcpy (br_buf + 1, in_br);
 423                       free (in_br);
 424                       in_br = br_buf;
 425                     }
 426                   *in_br = tchar;
 427                   break;
 428                 case ')':
 429                   if (*in_br == '(')
 430                     ++in_br;
 431                   break;
 432                 case ']':
 433                   if (*in_br == '[')
 434                     ++in_br;
 435                   break;
 436                 }
 437               sb_add_char (out, tchar);
 438               ++idx;
 439             }
 440           free (br_buf);
 441         }
 442     }
 443
 444   return idx;
 445 }
 446
 447 /* Allocate a new formal.  */
 448
 449 static formal_entry *
 450 new_formal (void)
 451 {
 452   formal_entry *formal;
 453
 454   formal = (formal_entry *) xmalloc (sizeof (formal_entry));
 455
 456   sb_new (&formal->name);
 457   sb_new (&formal->def);
 458   sb_new (&formal->actual);
 459   formal->next = NULL;
 460   formal->type = FORMAL_OPTIONAL;
 461   return formal;
 462 }
 463
 464 /* Free a formal.  */
 465
 466 static void
 467 del_formal (formal_entry *formal)
 468 {
 469   sb_kill (&formal->actual);
 470   sb_kill (&formal->def);
 471   sb_kill (&formal->name);
 472   free (formal);
 473 }
 474
 475 /* Pick up the formal parameters of a macro definition.  */
 476
 477 static int
 478 do_formals (macro_entry *macro, int idx, sb *in)
 479 {
 480   formal_entry **p = &macro->formals;
 481   const char *name;
 482
 483   idx = sb_skip_white (idx, in);
 484   while (idx < in->len)
 485     {
 486       formal_entry *formal = new_formal ();
 487       int cidx;
 488
 489       idx = get_token (idx, in, &formal->name);
 490       if (formal->name.len == 0)
 491         {
 492           if (macro->formal_count)
 493             --idx;
 494           del_formal (formal);  /* 'formal' goes out of scope.  */
 495           break;
 496         }
 497       idx = sb_skip_white (idx, in);
 498       /* This is a formal.  */
 499       name = sb_terminate (&formal->name);
 500       if (! macro_mri
 501           && idx < in->len
 502           && in->ptr[idx] == ':'
 503           && (! is_name_beginner (':')
 504               || idx + 1 >= in->len
 505               || ! is_part_of_name (in->ptr[idx + 1])))
 506         {
 507           /* Got a qualifier.  */
 508           sb qual;
 509
 510           sb_new (&qual);
 511           idx = get_token (sb_skip_white (idx + 1, in), in, &qual);
 512           sb_terminate (&qual);
 513           if (qual.len == 0)
 514             as_bad_where (macro->file,
 515                           macro->line,
 516                           _("Missing parameter qualifier for `%s' in macro `%s'"),
 517                           name,
 518                           macro->name);
 519           else if (strcmp (qual.ptr, "req") == 0)
 520             formal->type = FORMAL_REQUIRED;
 521           else if (strcmp (qual.ptr, "vararg") == 0)
 522             formal->type = FORMAL_VARARG;
 523           else
 524             as_bad_where (macro->file,
 525                           macro->line,
 526                           _("`%s' is not a valid parameter qualifier for `%s' in macro `%s'"),
 527                           qual.ptr,
 528                           name,
 529                           macro->name);
 530           sb_kill (&qual);
 531           idx = sb_skip_white (idx, in);
 532         }
 533       if (idx < in->len && in->ptr[idx] == '=')
 534         {
 535           /* Got a default.  */
 536           idx = get_any_string (idx + 1, in, &formal->def);
 537           idx = sb_skip_white (idx, in);
 538           if (formal->type == FORMAL_REQUIRED)
 539             {
 540               sb_reset (&formal->def);
 541               as_warn_where (macro->file,
 542                             macro->line,
 543                             _("Pointless default value for required parameter `%s' in macro `%s'"),
 544                             name,
 545                             macro->name);
 546             }
 547         }
 548
 549       /* Add to macro's hash table.  */
 550       if (! hash_find (macro->formal_hash, name))
 551         hash_jam (macro->formal_hash, name, formal);
 552       else
 553         as_bad_where (macro->file,
 554                       macro->line,
 555                       _("A parameter named `%s' already exists for macro `%s'"),
 556                       name,
 557                       macro->name);
 558
 559       formal->index = macro->formal_count++;
 560       *p = formal;
 561       p = &formal->next;
 562       if (formal->type == FORMAL_VARARG)
 563         break;
 564       cidx = idx;
 565       idx = sb_skip_comma (idx, in);
 566       if (idx != cidx && idx >= in->len)
 567         {
 568           idx = cidx;
 569           break;
 570         }
 571     }
 572
 573   if (macro_mri)
 574     {
 575       formal_entry *formal = new_formal ();
 576
 577       /* Add a special NARG formal, which macro_expand will set to the
 578          number of arguments.  */
 579       /* The same MRI assemblers which treat '@' characters also use
 580          the name $NARG.  At least until we find an exception.  */
 581       if (macro_strip_at)
 582         name = "$NARG";
 583       else
 584         name = "NARG";
 585
 586       sb_add_string (&formal->name, name);
 587
 588       /* Add to macro's hash table.  */
 589       if (hash_find (macro->formal_hash, name))
 590         as_bad_where (macro->file,
 591                       macro->line,
 592                       _("Reserved word `%s' used as parameter in macro `%s'"),
 593                       name,
 594                       macro->name);
 595       hash_jam (macro->formal_hash, name, formal);
 596
 597       formal->index = NARG_INDEX;
 598       *p = formal;
 599     }
 600
 601   return idx;
 602 }
 603
 604 /* Free the memory allocated to a macro.  */
 605
 606 static void
 607 free_macro (macro_entry *macro)
 608 {
 609   formal_entry *formal;
 610
 611   for (formal = macro->formals; formal; )
 612     {
 613       formal_entry *f;
 614
 615       f = formal;
 616       formal = formal->next;
 617       del_formal (f);
 618     }
 619   hash_die (macro->formal_hash);
 620   sb_kill (&macro->sub);
 621   free (macro);
 622 }
 623
 624 /* Define a new macro.  Returns NULL on success, otherwise returns an
 625    error message.  If NAMEP is not NULL, *NAMEP is set to the name of
 626    the macro which was defined.  */
 627
 628 const char *
 629 define_macro (int idx, sb *in, sb *label,
 630               int (*get_line) (sb *),
 631               char *file, unsigned int line,
 632               const char **namep)
 633 {
 634   macro_entry *macro;
 635   sb name;
 636   const char *error = NULL;
 637
 638   macro = (macro_entry *) xmalloc (sizeof (macro_entry));
 639   sb_new (&macro->sub);
 640   sb_new (&name);
 641   macro->file = file;
 642   macro->line = line;
 643
 644   macro->formal_count = 0;
 645   macro->formals = 0;
 646   macro->formal_hash = hash_new ();
 647
 648   idx = sb_skip_white (idx, in);
 649   if (! buffer_and_nest ("MACRO", "ENDM", &macro->sub, get_line))
 650     error = _("unexpected end of file in macro `%s' definition");
 651   if (label != NULL && label->len != 0)
 652     {
 653       sb_add_sb (&name, label);
 654       macro->name = sb_terminate (&name);
 655       if (idx < in->len && in->ptr[idx] == '(')
 656         {
 657           /* It's the label: MACRO (formals,...)  sort  */
 658           idx = do_formals (macro, idx + 1, in);
 659           if (idx < in->len && in->ptr[idx] == ')')
 660             idx = sb_skip_white (idx + 1, in);
 661           else if (!error)
 662             error = _("missing `)' after formals in macro definition `%s'");
 663         }
 664       else
 665         {
 666           /* It's the label: MACRO formals,...  sort  */
 667           idx = do_formals (macro, idx, in);
 668         }
 669     }
 670   else
 671     {
 672       int cidx;
 673
 674       idx = get_token (idx, in, &name);
 675       macro->name = sb_terminate (&name);
 676       if (name.len == 0)
 677         error = _("Missing macro name");
 678       cidx = sb_skip_white (idx, in);
 679       idx = sb_skip_comma (cidx, in);
 680       if (idx == cidx || idx < in->len)
 681         idx = do_formals (macro, idx, in);
 682       else
 683         idx = cidx;
 684     }
 685   if (!error && idx < in->len)
 686     error = _("Bad parameter list for macro `%s'");
 687
 688   /* And stick it in the macro hash table.  */
 689   for (idx = 0; idx < name.len; idx++)
 690     name.ptr[idx] = TOLOWER (name.ptr[idx]);
 691   if (hash_find (macro_hash, macro->name))
 692     error = _("Macro `%s' was already defined");
 693   if (!error)
 694     error = hash_jam (macro_hash, macro->name, (void *) macro);
 695
 696   if (namep != NULL)
 697     *namep = macro->name;
 698
 699   if (!error)
 700     macro_defined = 1;
 701   else
 702     free_macro (macro);
 703
 704   return error;
 705 }
 706
 707 /* Scan a token, and then skip KIND.  */
 708
 709 static int
 710 get_apost_token (int idx, sb *in, sb *name, int kind)
 711 {
 712   idx = get_token (idx, in, name);
 713   if (idx < in->len
 714       && in->ptr[idx] == kind
 715       && (! macro_mri || macro_strip_at)
 716       && (! macro_strip_at || kind == '@'))
 717     idx++;
 718   return idx;
 719 }
 720
 721 /* Substitute the actual value for a formal parameter.  */
 722
 723 static int
 724 sub_actual (int start, sb *in, sb *t, struct hash_control *formal_hash,
 725             int kind, sb *out, int copyifnotthere)
 726 {
 727   int src;
 728   formal_entry *ptr;
 729
 730   src = get_apost_token (start, in, t, kind);
 731   /* See if it's in the macro's hash table, unless this is
 732      macro_strip_at and kind is '@' and the token did not end in '@'.  */
 733   if (macro_strip_at
 734       && kind == '@'
 735       && (src == start || in->ptr[src - 1] != '@'))
 736     ptr = NULL;
 737   else
 738     ptr = (formal_entry *) hash_find (formal_hash, sb_terminate (t));
 739   if (ptr)
 740     {
 741       if (ptr->actual.len)
 742         {
 743           sb_add_sb (out, &ptr->actual);
 744         }
 745       else
 746         {
 747           sb_add_sb (out, &ptr->def);
 748         }
 749     }
 750   else if (kind == '&')
 751     {
 752       /* Doing this permits people to use & in macro bodies.  */
 753       sb_add_char (out, '&');
 754       sb_add_sb (out, t);
 755       if (src != start && in->ptr[src - 1] == '&')
 756         sb_add_char (out, '&');
 757     }
 758   else if (copyifnotthere)
 759     {
 760       sb_add_sb (out, t);
 761     }
 762   else
 763     {
 764       sb_add_char (out, '\\');
 765       sb_add_sb (out, t);
 766     }
 767   return src;
 768 }
 769
 770 /* Expand the body of a macro.  */
 771
 772 static const char *
 773 macro_expand_body (sb *in, sb *out, formal_entry *formals,
 774                    struct hash_control *formal_hash, const macro_entry *macro)
 775 {
 776   sb t;
 777   int src = 0, inquote = 0, macro_line = 0;
 778   formal_entry *loclist = NULL;
 779   const char *err = NULL;
 780
 781   sb_new (&t);
 782
 783   while (src < in->len && !err)
 784     {
 785       if (in->ptr[src] == '&')
 786         {
 787           sb_reset (&t);
 788           if (macro_mri)
 789             {
 790               if (src + 1 < in->len && in->ptr[src + 1] == '&')
 791                 src = sub_actual (src + 2, in, &t, formal_hash, '\'', out, 1);
 792               else
 793                 sb_add_char (out, in->ptr[src++]);
 794             }
 795           else
 796             {
 797               /* Permit macro parameter substition delineated with
 798                  an '&' prefix and optional '&' suffix.  */
 799               src = sub_actual (src + 1, in, &t, formal_hash, '&', out, 0);
 800             }
 801         }
 802       else if (in->ptr[src] == '\\')
 803         {
 804           src++;
 805           if (src < in->len && in->ptr[src] == '(')
 806             {
 807               /* Sub in till the next ')' literally.  */
 808               src++;
 809               while (src < in->len && in->ptr[src] != ')')
 810                 {
 811                   sb_add_char (out, in->ptr[src++]);
 812                 }
 813               if (src < in->len)
 814                 src++;
 815               else if (!macro)
 816                 err = _("missing `)'");
 817               else
 818                 as_bad_where (macro->file, macro->line + macro_line, _("missing `)'"));
 819             }
 820           else if (src < in->len && in->ptr[src] == '@')
 821             {
 822               /* Sub in the macro invocation number.  */
 823
 824               char buffer[10];
 825               src++;
 826               sprintf (buffer, "%d", macro_number);
 827               sb_add_string (out, buffer);
 828             }
 829           else if (src < in->len && in->ptr[src] == '&')
 830             {
 831               /* This is a preprocessor variable name, we don't do them
 832                  here.  */
 833               sb_add_char (out, '\\');
 834               sb_add_char (out, '&');
 835               src++;
 836             }
 837           else if (macro_mri && src < in->len && ISALNUM (in->ptr[src]))
 838             {
 839               int ind;
 840               formal_entry *f;
 841
 842               if (ISDIGIT (in->ptr[src]))
 843                 ind = in->ptr[src] - '0';
 844               else if (ISUPPER (in->ptr[src]))
 845                 ind = in->ptr[src] - 'A' + 10;
 846               else
 847                 ind = in->ptr[src] - 'a' + 10;
 848               ++src;
 849               for (f = formals; f != NULL; f = f->next)
 850                 {
 851                   if (f->index == ind - 1)
 852                     {
 853                       if (f->actual.len != 0)
 854                         sb_add_sb (out, &f->actual);
 855                       else
 856                         sb_add_sb (out, &f->def);
 857                       break;
 858                     }
 859                 }
 860             }
 861           else
 862             {
 863               sb_reset (&t);
 864               src = sub_actual (src, in, &t, formal_hash, '\'', out, 0);
 865             }
 866         }
 867       else if ((macro_alternate || macro_mri)
 868                && is_name_beginner (in->ptr[src])
 869                && (! inquote
 870                    || ! macro_strip_at
 871                    || (src > 0 && in->ptr[src - 1] == '@')))
 872         {
 873           if (! macro
 874               || src + 5 >= in->len
 875               || strncasecmp (in->ptr + src, "LOCAL", 5) != 0
 876               || ! ISWHITE (in->ptr[src + 5])
 877               /* PR 11507: Skip keyword LOCAL if it is found inside a quoted string.  */
 878               || inquote)
 879             {
 880               sb_reset (&t);
 881               src = sub_actual (src, in, &t, formal_hash,
 882                                 (macro_strip_at && inquote) ? '@' : '\'',
 883                                 out, 1);
 884             }
 885           else
 886             {
 887               src = sb_skip_white (src + 5, in);
 888               while (in->ptr[src] != '\n')
 889                 {
 890                   const char *name;
 891                   formal_entry *f = new_formal ();
 892
 893                   src = get_token (src, in, &f->name);
 894                   name = sb_terminate (&f->name);
 895                   if (! hash_find (formal_hash, name))
 896                     {
 897                       static int loccnt;
 898                       char buf[20];
 899
 900                       f->index = LOCAL_INDEX;
 901                       f->next = loclist;
 902                       loclist = f;
 903
 904                       sprintf (buf, IS_ELF ? ".LL%04x" : "LL%04x", ++loccnt);
 905                       sb_add_string (&f->actual, buf);
 906
 907                       err = hash_jam (formal_hash, name, f);
 908                       if (err != NULL)
 909                         break;
 910                     }
 911                   else
 912                     {
 913                       as_bad_where (macro->file,
 914                                     macro->line + macro_line,
 915                                     _("`%s' was already used as parameter (or another local) name"),
 916                                     name);
 917                       del_formal (f);
 918                     }
 919
 920                   src = sb_skip_comma (src, in);
 921                 }
 922             }
 923         }
 924       else if (in->ptr[src] == '"'
 925                || (macro_mri && in->ptr[src] == '\''))
 926         {
 927           inquote = !inquote;
 928           sb_add_char (out, in->ptr[src++]);
 929         }
 930       else if (in->ptr[src] == '@' && macro_strip_at)
 931         {
 932           ++src;
 933           if (src < in->len
 934               && in->ptr[src] == '@')
 935             {
 936               sb_add_char (out, '@');
 937               ++src;
 938             }
 939         }
 940       else if (macro_mri
 941                && in->ptr[src] == '='
 942                && src + 1 < in->len
 943                && in->ptr[src + 1] == '=')
 944         {
 945           formal_entry *ptr;
 946
 947           sb_reset (&t);
 948           src = get_token (src + 2, in, &t);
 949           ptr = (formal_entry *) hash_find (formal_hash, sb_terminate (&t));
 950           if (ptr == NULL)
 951             {
 952               /* FIXME: We should really return a warning string here,
 953                  but we can't, because the == might be in the MRI
 954                  comment field, and, since the nature of the MRI
 955                  comment field depends upon the exact instruction
 956                  being used, we don't have enough information here to
 957                  figure out whether it is or not.  Instead, we leave
 958                  the == in place, which should cause a syntax error if
 959                  it is not in a comment.  */
 960               sb_add_char (out, '=');
 961               sb_add_char (out, '=');
 962               sb_add_sb (out, &t);
 963             }
 964           else
 965             {
 966               if (ptr->actual.len)
 967                 {
 968                   sb_add_string (out, "-1");
 969                 }
 970               else
 971                 {
 972                   sb_add_char (out, '0');
 973                 }
 974             }
 975         }
 976       else
 977         {
 978           if (in->ptr[src] == '\n')
 979             ++macro_line;
 980           sb_add_char (out, in->ptr[src++]);
 981         }
 982     }
 983
 984   sb_kill (&t);
 985
 986   while (loclist != NULL)
 987     {
 988       formal_entry *f;
 989       const char *name;
 990
 991       f = loclist->next;
 992       name = sb_terminate (&loclist->name);
 993       hash_delete (formal_hash, name, f == NULL);
 994       del_formal (loclist);
 995       loclist = f;
 996     }
 997
 998   return err;
 999 }
1000
1001 /* Assign values to the formal parameters of a macro, and expand the
1002    body.  */
1003
1004 static const char *
1005 macro_expand (int idx, sb *in, macro_entry *m, sb *out)
1006 {
1007   sb t;
1008   formal_entry *ptr;
1009   formal_entry *f;
1010   int is_keyword = 0;
1011   int narg = 0;
1012   const char *err = NULL;
1013
1014   sb_new (&t);
1015
1016   /* Reset any old value the actuals may have.  */
1017   for (f = m->formals; f; f = f->next)
1018     sb_reset (&f->actual);
1019   f = m->formals;
1020   while (f != NULL && f->index < 0)
1021     f = f->next;
1022
1023   if (macro_mri)
1024     {
1025       /* The macro may be called with an optional qualifier, which may
1026          be referred to in the macro body as \0.  */
1027       if (idx < in->len && in->ptr[idx] == '.')
1028         {
1029           /* The Microtec assembler ignores this if followed by a white space.
1030              (Macro invocation with empty extension) */
1031           idx++;
1032           if (    idx < in->len
1033                   && in->ptr[idx] != ' '
1034                   && in->ptr[idx] != '\t')
1035             {
1036               formal_entry *n = new_formal ();
1037
1038               n->index = QUAL_INDEX;
1039
1040               n->next = m->formals;
1041               m->formals = n;
1042
1043               idx = get_any_string (idx, in, &n->actual);
1044             }
1045         }
1046     }
1047
1048   /* Peel off the actuals and store them away in the hash tables' actuals.  */
1049   idx = sb_skip_white (idx, in);
1050   while (idx < in->len)
1051     {
1052       int scan;
1053
1054       /* Look and see if it's a positional or keyword arg.  */
1055       scan = idx;
1056       while (scan < in->len
1057              && !ISSEP (in->ptr[scan])
1058              && !(macro_mri && in->ptr[scan] == '\'')
1059              && (!macro_alternate && in->ptr[scan] != '='))
1060         scan++;
1061       if (scan < in->len && !macro_alternate && in->ptr[scan] == '=')
1062         {
1063           is_keyword = 1;
1064
1065           /* It's OK to go from positional to keyword.  */
1066
1067           /* This is a keyword arg, fetch the formal name and
1068              then the actual stuff.  */
1069           sb_reset (&t);
1070           idx = get_token (idx, in, &t);
1071           if (in->ptr[idx] != '=')
1072             {
1073               err = _("confusion in formal parameters");
1074               break;
1075             }
1076
1077           /* Lookup the formal in the macro's list.  */
1078           ptr = (formal_entry *) hash_find (m->formal_hash, sb_terminate (&t));
1079           if (!ptr)
1080             {
1081               as_bad (_("Parameter named `%s' does not exist for macro `%s'"),
1082                       t.ptr,
1083                       m->name);
1084               sb_reset (&t);
1085               idx = get_any_string (idx + 1, in, &t);
1086             }
1087           else
1088             {
1089               /* Insert this value into the right place.  */
1090               if (ptr->actual.len)
1091                 {
1092                   as_warn (_("Value for parameter `%s' of macro `%s' was already specified"),
1093                            ptr->name.ptr,
1094                            m->name);
1095                   sb_reset (&ptr->actual);
1096                 }
1097               idx = get_any_string (idx + 1, in, &ptr->actual);
1098               if (ptr->actual.len > 0)
1099                 ++narg;
1100             }
1101         }
1102       else
1103         {
1104           if (is_keyword)
1105             {
1106               err = _("can't mix positional and keyword arguments");
1107               break;
1108             }
1109
1110           if (!f)
1111             {
1112               formal_entry **pf;
1113               int c;
1114
1115               if (!macro_mri)
1116                 {
1117                   err = _("too many positional arguments");
1118                   break;
1119                 }
1120
1121               f = new_formal ();
1122
1123               c = -1;
1124               for (pf = &m->formals; *pf != NULL; pf = &(*pf)->next)
1125                 if ((*pf)->index >= c)
1126                   c = (*pf)->index + 1;
1127               if (c == -1)
1128                 c = 0;
1129               *pf = f;
1130               f->index = c;
1131             }
1132
1133           if (f->type != FORMAL_VARARG)
1134             idx = get_any_string (idx, in, &f->actual);
1135           else
1136             {
1137               sb_add_buffer (&f->actual, in->ptr + idx, in->len - idx);
1138               idx = in->len;
1139             }
1140           if (f->actual.len > 0)
1141             ++narg;
1142           do
1143             {
1144               f = f->next;
1145             }
1146           while (f != NULL && f->index < 0);
1147         }
1148
1149       if (! macro_mri)
1150         idx = sb_skip_comma (idx, in);
1151       else
1152         {
1153           if (in->ptr[idx] == ',')
1154             ++idx;
1155           if (ISWHITE (in->ptr[idx]))
1156             break;
1157         }
1158     }
1159
1160   if (! err)
1161     {
1162       for (ptr = m->formals; ptr; ptr = ptr->next)
1163         {
1164           if (ptr->type == FORMAL_REQUIRED && ptr->actual.len == 0)
1165             as_bad (_("Missing value for required parameter `%s' of macro `%s'"),
1166                     ptr->name.ptr,
1167                     m->name);
1168         }
1169
1170       if (macro_mri)
1171         {
1172           char buffer[20];
1173
1174           sb_reset (&t);
1175           sb_add_string (&t, macro_strip_at ? "$NARG" : "NARG");
1176           ptr = (formal_entry *) hash_find (m->formal_hash, sb_terminate (&t));
1177           sprintf (buffer, "%d", narg);
1178           sb_add_string (&ptr->actual, buffer);
1179         }
1180
1181       err = macro_expand_body (&m->sub, out, m->formals, m->formal_hash, m);
1182     }
1183
1184   /* Discard any unnamed formal arguments.  */
1185   if (macro_mri)
1186     {
1187       formal_entry **pf;
1188
1189       pf = &m->formals;
1190       while (*pf != NULL)
1191         {
1192           if ((*pf)->name.len != 0)
1193             pf = &(*pf)->next;
1194           else
1195             {
1196               f = (*pf)->next;
1197               del_formal (*pf);
1198               *pf = f;
1199             }
1200         }
1201     }
1202
1203   sb_kill (&t);
1204   if (!err)
1205     macro_number++;
1206
1207   return err;
1208 }
1209
1210 /* Check for a macro.  If one is found, put the expansion into
1211    *EXPAND.  Return 1 if a macro is found, 0 otherwise.  */
1212
1213 int
1214 check_macro (const char *line, sb *expand,
1215              const char **error, macro_entry **info)
1216 {
1217   const char *s;
1218   char *copy, *cls;
1219   macro_entry *macro;
1220   sb line_sb;
1221
1222   if (! is_name_beginner (*line)
1223       && (! macro_mri || *line != '.'))
1224     return 0;
1225
1226   s = line + 1;
1227   while (is_part_of_name (*s))
1228     ++s;
1229   if (is_name_ender (*s))
1230     ++s;
1231
1232   copy = (char *) alloca (s - line + 1);
1233   memcpy (copy, line, s - line);
1234   copy[s - line] = '\0';
1235   for (cls = copy; *cls != '\0'; cls ++)
1236     *cls = TOLOWER (*cls);
1237
1238   macro = (macro_entry *) hash_find (macro_hash, copy);
1239
1240   if (macro == NULL)
1241     return 0;
1242
1243   /* Wrap the line up in an sb.  */
1244   sb_new (&line_sb);
1245   while (*s != '\0' && *s != '\n' && *s != '\r')
1246     sb_add_char (&line_sb, *s++);
1247
1248   sb_new (expand);
1249   *error = macro_expand (0, &line_sb, macro, expand);
1250
1251   sb_kill (&line_sb);
1252
1253   /* Export the macro information if requested.  */
1254   if (info)
1255     *info = macro;
1256
1257   return 1;
1258 }
1259
1260 /* Delete a macro.  */
1261
1262 void
1263 delete_macro (const char *name)
1264 {
1265   char *copy;
1266   size_t i, len;
1267   macro_entry *macro;
1268
1269   len = strlen (name);
1270   copy = (char *) alloca (len + 1);
1271   for (i = 0; i < len; ++i)
1272     copy[i] = TOLOWER (name[i]);
1273   copy[i] = '\0';
1274
1275   /* We can only ask hash_delete to free memory if we are deleting
1276      macros in reverse order to their definition.
1277      So just clear out the entry.  */
1278   if ((macro = (macro_entry *) hash_find (macro_hash, copy)) != NULL)
1279     {
1280       hash_jam (macro_hash, copy, NULL);
1281       free_macro (macro);
1282     }
1283   else
1284     as_warn (_("Attempt to purge non-existant macro `%s'"), copy);
1285 }
1286
1287 /* Handle the MRI IRP and IRPC pseudo-ops.  These are handled as a
1288    combined macro definition and execution.  This returns NULL on
1289    success, or an error message otherwise.  */
1290
1291 const char *
1292 expand_irp (int irpc, int idx, sb *in, sb *out, int (*get_line) (sb *))
1293 {
1294   sb sub;
1295   formal_entry f;
1296   struct hash_control *h;
1297   const char *err;
1298
1299   idx = sb_skip_white (idx, in);
1300
1301   sb_new (&sub);
1302   if (! buffer_and_nest (NULL, "ENDR", &sub, get_line))
1303     return _("unexpected end of file in irp or irpc");
1304
1305   sb_new (&f.name);
1306   sb_new (&f.def);
1307   sb_new (&f.actual);
1308
1309   idx = get_token (idx, in, &f.name);
1310   if (f.name.len == 0)
1311     return _("missing model parameter");
1312
1313   h = hash_new ();
1314   err = hash_jam (h, sb_terminate (&f.name), &f);
1315   if (err != NULL)
1316     return err;
1317
1318   f.index = 1;
1319   f.next = NULL;
1320   f.type = FORMAL_OPTIONAL;
1321
1322   sb_reset (out);
1323
1324   idx = sb_skip_comma (idx, in);
1325   if (idx >= in->len)
1326     {
1327       /* Expand once with a null string.  */
1328       err = macro_expand_body (&sub, out, &f, h, 0);
1329     }
1330   else
1331     {
1332       bfd_boolean in_quotes = FALSE;
1333
1334       if (irpc && in->ptr[idx] == '"')
1335         {
1336           in_quotes = TRUE;
1337           ++idx;
1338         }
1339
1340       while (idx < in->len)
1341         {
1342           if (!irpc)
1343             idx = get_any_string (idx, in, &f.actual);
1344           else
1345             {
1346               if (in->ptr[idx] == '"')
1347                 {
1348                   int nxt;
1349
1350                   if (irpc)
1351                     in_quotes = ! in_quotes;
1352
1353                   nxt = sb_skip_white (idx + 1, in);
1354                   if (nxt >= in->len)
1355                     {
1356                       idx = nxt;
1357                       break;
1358                     }
1359                 }
1360               sb_reset (&f.actual);
1361               sb_add_char (&f.actual, in->ptr[idx]);
1362               ++idx;
1363             }
1364
1365           err = macro_expand_body (&sub, out, &f, h, 0);
1366           if (err != NULL)
1367             break;
1368           if (!irpc)
1369             idx = sb_skip_comma (idx, in);
1370           else if (! in_quotes)
1371             idx = sb_skip_white (idx, in);
1372         }
1373     }
1374
1375   hash_die (h);
1376   sb_kill (&f.actual);
1377   sb_kill (&f.def);
1378   sb_kill (&f.name);
1379   sb_kill (&sub);
1380
1381   return err;
1382 }