ld/ldexp.c

   1 /* This module handles expression trees.
   2    Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
   3    2001, 2002, 2003, 2004
   4    Free Software Foundation, Inc.
   5    Written by Steve Chamberlain of Cygnus Support <sac@cygnus.com>.
   6
   7 This file is part of GLD, the Gnu Linker.
   8
   9 GLD is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2, or (at your option)
  12 any later version.
  13
  14 GLD is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GLD; see the file COPYING.  If not, write to the Free
  21 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  22 02111-1307, USA.  */
  23
  24 /* This module is in charge of working out the contents of expressions.
  25
  26    It has to keep track of the relative/absness of a symbol etc. This
  27    is done by keeping all values in a struct (an etree_value_type)
  28    which contains a value, a section to which it is relative and a
  29    valid bit.  */
  30
  31 #include "bfd.h"
  32 #include "sysdep.h"
  33 #include "bfdlink.h"
  34
  35 #include "ld.h"
  36 #include "ldmain.h"
  37 #include "ldmisc.h"
  38 #include "ldexp.h"
  39 #include <ldgram.h>
  40 #include "ldlang.h"
  41 #include "libiberty.h"
  42 #include "safe-ctype.h"
  43
  44 static etree_value_type exp_fold_tree_no_dot
  45   (etree_type *, lang_output_section_statement_type *, lang_phase_type);
  46 static bfd_vma align_n
  47   (bfd_vma, bfd_vma);
  48
  49 struct exp_data_seg exp_data_seg;
  50
  51 /* Print the string representation of the given token.  Surround it
  52    with spaces if INFIX_P is TRUE.  */
  53
  54 static void
  55 exp_print_token (token_code_type code, int infix_p)
  56 {
  57   static const struct
  58   {
  59     token_code_type code;
  60     char * name;
  61   }
  62   table[] =
  63   {
  64     { INT, "int" },
  65     { NAME, "NAME" },
  66     { PLUSEQ, "+=" },
  67     { MINUSEQ, "-=" },
  68     { MULTEQ, "*=" },
  69     { DIVEQ, "/=" },
  70     { LSHIFTEQ, "<<=" },
  71     { RSHIFTEQ, ">>=" },
  72     { ANDEQ, "&=" },
  73     { OREQ, "|=" },
  74     { OROR, "||" },
  75     { ANDAND, "&&" },
  76     { EQ, "==" },
  77     { NE, "!=" },
  78     { LE, "<=" },
  79     { GE, ">=" },
  80     { LSHIFT, "<<" },
  81     { RSHIFT, ">>" },
  82     { ALIGN_K, "ALIGN" },
  83     { BLOCK, "BLOCK" },
  84     { QUAD, "QUAD" },
  85     { SQUAD, "SQUAD" },
  86     { LONG, "LONG" },
  87     { SHORT, "SHORT" },
  88     { BYTE, "BYTE" },
  89     { SECTIONS, "SECTIONS" },
  90     { SIZEOF_HEADERS, "SIZEOF_HEADERS" },
  91     { MEMORY, "MEMORY" },
  92     { DEFINED, "DEFINED" },
  93     { TARGET_K, "TARGET" },
  94     { SEARCH_DIR, "SEARCH_DIR" },
  95     { MAP, "MAP" },
  96     { ENTRY, "ENTRY" },
  97     { NEXT, "NEXT" },
  98     { SIZEOF, "SIZEOF" },
  99     { ADDR, "ADDR" },
 100     { LOADADDR, "LOADADDR" },
 101     { MAX_K, "MAX_K" },
 102     { REL, "relocatable" },
 103     { DATA_SEGMENT_ALIGN, "DATA_SEGMENT_ALIGN" },
 104     { DATA_SEGMENT_RELRO_END, "DATA_SEGMENT_RELRO_END" },
 105     { DATA_SEGMENT_END, "DATA_SEGMENT_END" }
 106   };
 107   unsigned int idx;
 108
 109   for (idx = 0; idx < ARRAY_SIZE (table); idx++)
 110     if (table[idx].code == code)
 111       break;
 112
 113   if (infix_p)
 114     fputc (' ', config.map_file);
 115
 116   if (idx < ARRAY_SIZE (table))
 117     fputs (table[idx].name, config.map_file);
 118   else if (code < 127)
 119     fputc (code, config.map_file);
 120   else
 121     fprintf (config.map_file, "<code %d>", code);
 122
 123   if (infix_p)
 124     fputc (' ', config.map_file);
 125 }
 126
 127 static void
 128 make_abs (etree_value_type *ptr)
 129 {
 130   asection *s = ptr->section->bfd_section;
 131   ptr->value += s->vma;
 132   ptr->section = abs_output_section;
 133 }
 134
 135 static etree_value_type
 136 new_abs (bfd_vma value)
 137 {
 138   etree_value_type new;
 139   new.valid_p = TRUE;
 140   new.section = abs_output_section;
 141   new.value = value;
 142   return new;
 143 }
 144
 145 etree_type *
 146 exp_intop (bfd_vma value)
 147 {
 148   etree_type *new = stat_alloc (sizeof (new->value));
 149   new->type.node_code = INT;
 150   new->value.value = value;
 151   new->value.str = NULL;
 152   new->type.node_class = etree_value;
 153   return new;
 154 }
 155
 156 etree_type *
 157 exp_bigintop (bfd_vma value, char *str)
 158 {
 159   etree_type *new = stat_alloc (sizeof (new->value));
 160   new->type.node_code = INT;
 161   new->value.value = value;
 162   new->value.str = str;
 163   new->type.node_class = etree_value;
 164   return new;
 165 }
 166
 167 /* Build an expression representing an unnamed relocatable value.  */
 168
 169 etree_type *
 170 exp_relop (asection *section, bfd_vma value)
 171 {
 172   etree_type *new = stat_alloc (sizeof (new->rel));
 173   new->type.node_code = REL;
 174   new->type.node_class = etree_rel;
 175   new->rel.section = section;
 176   new->rel.value = value;
 177   return new;
 178 }
 179
 180 static etree_value_type
 181 new_rel (bfd_vma value,
 182          char *str,
 183          lang_output_section_statement_type *section)
 184 {
 185   etree_value_type new;
 186   new.valid_p = TRUE;
 187   new.value = value;
 188   new.str = str;
 189   new.section = section;
 190   return new;
 191 }
 192
 193 static etree_value_type
 194 new_rel_from_section (bfd_vma value,
 195                       lang_output_section_statement_type *section)
 196 {
 197   etree_value_type new;
 198   new.valid_p = TRUE;
 199   new.value = value;
 200   new.str = NULL;
 201   new.section = section;
 202
 203   new.value -= section->bfd_section->vma;
 204
 205   return new;
 206 }
 207
 208 static etree_value_type
 209 fold_unary (etree_type *tree,
 210             lang_output_section_statement_type *current_section,
 211             lang_phase_type allocation_done,
 212             bfd_vma dot,
 213             bfd_vma *dotp)
 214 {
 215   etree_value_type result;
 216
 217   result = exp_fold_tree (tree->unary.child,
 218                           current_section,
 219                           allocation_done, dot, dotp);
 220   if (result.valid_p)
 221     {
 222       switch (tree->type.node_code)
 223         {
 224         case ALIGN_K:
 225           if (allocation_done != lang_first_phase_enum)
 226             result = new_rel_from_section (align_n (dot, result.value),
 227                                            current_section);
 228           else
 229             result.valid_p = FALSE;
 230           break;
 231
 232         case ABSOLUTE:
 233           if (allocation_done != lang_first_phase_enum)
 234             {
 235               result.value += result.section->bfd_section->vma;
 236               result.section = abs_output_section;
 237             }
 238           else
 239             result.valid_p = FALSE;
 240           break;
 241
 242         case '~':
 243           make_abs (&result);
 244           result.value = ~result.value;
 245           break;
 246
 247         case '!':
 248           make_abs (&result);
 249           result.value = !result.value;
 250           break;
 251
 252         case '-':
 253           make_abs (&result);
 254           result.value = -result.value;
 255           break;
 256
 257         case NEXT:
 258           /* Return next place aligned to value.  */
 259           if (allocation_done == lang_allocating_phase_enum)
 260             {
 261               make_abs (&result);
 262               result.value = align_n (dot, result.value);
 263             }
 264           else
 265             result.valid_p = FALSE;
 266           break;
 267
 268         case DATA_SEGMENT_RELRO_END:
 269           if (allocation_done != lang_first_phase_enum
 270               && (exp_data_seg.phase == exp_dataseg_align_seen
 271                   || exp_data_seg.phase == exp_dataseg_adjust
 272                   || exp_data_seg.phase == exp_dataseg_relro_adjust
 273                   || allocation_done != lang_allocating_phase_enum))
 274             {
 275               if (exp_data_seg.phase == exp_dataseg_align_seen
 276                   || exp_data_seg.phase == exp_dataseg_relro_adjust)
 277                 exp_data_seg.relro_end
 278                   = result.value + current_section->bfd_section->vma;
 279               if (exp_data_seg.phase == exp_dataseg_align_seen)
 280                 exp_data_seg.phase = exp_dataseg_relro_seen;
 281               result.value = dot - current_section->bfd_section->vma;
 282             }
 283           else
 284             result.valid_p = FALSE;
 285           break;
 286
 287         case DATA_SEGMENT_END:
 288           if (allocation_done != lang_first_phase_enum
 289               && current_section == abs_output_section
 290               && (exp_data_seg.phase == exp_dataseg_align_seen
 291                   || exp_data_seg.phase == exp_dataseg_relro_seen
 292                   || exp_data_seg.phase == exp_dataseg_adjust
 293                   || exp_data_seg.phase == exp_dataseg_relro_adjust
 294                   || allocation_done != lang_allocating_phase_enum))
 295             {
 296               if (exp_data_seg.phase == exp_dataseg_align_seen
 297                   || exp_data_seg.phase == exp_dataseg_relro_seen)
 298                 {
 299                   exp_data_seg.phase = exp_dataseg_end_seen;
 300                   exp_data_seg.end = result.value;
 301                 }
 302             }
 303           else
 304             result.valid_p = FALSE;
 305           break;
 306
 307         default:
 308           FAIL ();
 309           break;
 310         }
 311     }
 312
 313   return result;
 314 }
 315
 316 static etree_value_type
 317 fold_binary (etree_type *tree,
 318              lang_output_section_statement_type *current_section,
 319              lang_phase_type allocation_done,
 320              bfd_vma dot,
 321              bfd_vma *dotp)
 322 {
 323   etree_value_type result;
 324
 325   result = exp_fold_tree (tree->binary.lhs, current_section,
 326                           allocation_done, dot, dotp);
 327   if (result.valid_p)
 328     {
 329       etree_value_type other;
 330
 331       other = exp_fold_tree (tree->binary.rhs,
 332                              current_section,
 333                              allocation_done, dot, dotp);
 334       if (other.valid_p)
 335         {
 336           /* If the values are from different sections, or this is an
 337              absolute expression, make both the source arguments
 338              absolute.  However, adding or subtracting an absolute
 339              value from a relative value is meaningful, and is an
 340              exception.  */
 341           if (current_section != abs_output_section
 342               && (other.section == abs_output_section
 343                   || (result.section == abs_output_section
 344                       && tree->type.node_code == '+'))
 345               && (tree->type.node_code == '+'
 346                   || tree->type.node_code == '-'))
 347             {
 348               if (other.section != abs_output_section)
 349                 {
 350                   /* Keep the section of the other term.  */
 351                   if (tree->type.node_code == '+')
 352                     other.value = result.value + other.value;
 353                   else
 354                     other.value = result.value - other.value;
 355                   return other;
 356                 }
 357             }
 358           else if (result.section != other.section
 359                    || current_section == abs_output_section)
 360             {
 361               make_abs (&result);
 362               make_abs (&other);
 363             }
 364
 365           switch (tree->type.node_code)
 366             {
 367             case '%':
 368               if (other.value == 0)
 369                 einfo (_("%F%S %% by zero\n"));
 370               result.value = ((bfd_signed_vma) result.value
 371                               % (bfd_signed_vma) other.value);
 372               break;
 373
 374             case '/':
 375               if (other.value == 0)
 376                 einfo (_("%F%S / by zero\n"));
 377               result.value = ((bfd_signed_vma) result.value
 378                               / (bfd_signed_vma) other.value);
 379               break;
 380
 381 #define BOP(x,y) case x : result.value = result.value y other.value; break;
 382               BOP ('+', +);
 383               BOP ('*', *);
 384               BOP ('-', -);
 385               BOP (LSHIFT, <<);
 386               BOP (RSHIFT, >>);
 387               BOP (EQ, ==);
 388               BOP (NE, !=);
 389               BOP ('<', <);
 390               BOP ('>', >);
 391               BOP (LE, <=);
 392               BOP (GE, >=);
 393               BOP ('&', &);
 394               BOP ('^', ^);
 395               BOP ('|', |);
 396               BOP (ANDAND, &&);
 397               BOP (OROR, ||);
 398
 399             case MAX_K:
 400               if (result.value < other.value)
 401                 result = other;
 402               break;
 403
 404             case MIN_K:
 405               if (result.value > other.value)
 406                 result = other;
 407               break;
 408
 409             case ALIGN_K:
 410               result.value = align_n (result.value, other.value);
 411               break;
 412
 413             case DATA_SEGMENT_ALIGN:
 414               if (allocation_done != lang_first_phase_enum
 415                   && current_section == abs_output_section
 416                   && (exp_data_seg.phase == exp_dataseg_none
 417                       || exp_data_seg.phase == exp_dataseg_adjust
 418                       || exp_data_seg.phase == exp_dataseg_relro_adjust
 419                       || allocation_done != lang_allocating_phase_enum))
 420                 {
 421                   bfd_vma maxpage = result.value;
 422
 423                   result.value = align_n (dot, maxpage);
 424                   if (exp_data_seg.phase == exp_dataseg_relro_adjust)
 425                     {
 426                       /* Attempt to align DATA_SEGMENT_RELRO_END at
 427                          a common page boundary.  */
 428                       bfd_vma relro;
 429
 430                       relro = exp_data_seg.relro_end - exp_data_seg.base;
 431                       result.value += -relro & (other.value - 1);
 432                       exp_data_seg.base = result.value;
 433                     }
 434                   else if (exp_data_seg.phase != exp_dataseg_adjust)
 435                     {
 436                       result.value += dot & (maxpage - 1);
 437                       if (allocation_done == lang_allocating_phase_enum)
 438                         {
 439                           exp_data_seg.phase = exp_dataseg_align_seen;
 440                           exp_data_seg.base = result.value;
 441                           exp_data_seg.pagesize = other.value;
 442                           exp_data_seg.relro_end = 0;
 443                         }
 444                     }
 445                   else if (other.value < maxpage)
 446                     result.value += (dot + other.value - 1)
 447                                     & (maxpage - other.value);
 448                 }
 449               else
 450                 result.valid_p = FALSE;
 451               break;
 452
 453             default:
 454               FAIL ();
 455             }
 456         }
 457       else
 458         {
 459           result.valid_p = FALSE;
 460         }
 461     }
 462
 463   return result;
 464 }
 465
 466 static etree_value_type
 467 fold_trinary (etree_type *tree,
 468               lang_output_section_statement_type *current_section,
 469               lang_phase_type allocation_done,
 470               bfd_vma dot,
 471               bfd_vma *dotp)
 472 {
 473   etree_value_type result;
 474
 475   result = exp_fold_tree (tree->trinary.cond, current_section,
 476                           allocation_done, dot, dotp);
 477   if (result.valid_p)
 478     result = exp_fold_tree ((result.value
 479                              ? tree->trinary.lhs
 480                              : tree->trinary.rhs),
 481                             current_section,
 482                             allocation_done, dot, dotp);
 483
 484   return result;
 485 }
 486
 487 static etree_value_type
 488 fold_name (etree_type *tree,
 489            lang_output_section_statement_type *current_section,
 490            lang_phase_type allocation_done,
 491            bfd_vma dot)
 492 {
 493   etree_value_type result;
 494
 495   result.valid_p = FALSE;
 496
 497   switch (tree->type.node_code)
 498     {
 499     case SIZEOF_HEADERS:
 500       if (allocation_done != lang_first_phase_enum)
 501         result = new_abs (bfd_sizeof_headers (output_bfd,
 502                                               link_info.relocatable));
 503       break;
 504     case DEFINED:
 505       if (allocation_done == lang_first_phase_enum)
 506         lang_track_definedness (tree->name.name);
 507       else
 508         {
 509           struct bfd_link_hash_entry *h;
 510           int def_iteration
 511             = lang_symbol_definition_iteration (tree->name.name);
 512
 513           h = bfd_wrapped_link_hash_lookup (output_bfd, &link_info,
 514                                             tree->name.name,
 515                                             FALSE, FALSE, TRUE);
 516           result.value = (h != NULL
 517                           && (h->type == bfd_link_hash_defined
 518                               || h->type == bfd_link_hash_defweak
 519                               || h->type == bfd_link_hash_common)
 520                           && (def_iteration == lang_statement_iteration
 521                               || def_iteration == -1));
 522           result.section = abs_output_section;
 523           result.valid_p = TRUE;
 524         }
 525       break;
 526     case NAME:
 527       if (tree->name.name[0] == '.' && tree->name.name[1] == 0)
 528         {
 529           if (allocation_done != lang_first_phase_enum)
 530             result = new_rel_from_section (dot, current_section);
 531         }
 532       else if (allocation_done != lang_first_phase_enum)
 533         {
 534           struct bfd_link_hash_entry *h;
 535
 536           h = bfd_wrapped_link_hash_lookup (output_bfd, &link_info,
 537                                             tree->name.name,
 538                                             TRUE, FALSE, TRUE);
 539           if (!h)
 540             einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
 541           else if (h->type == bfd_link_hash_defined
 542                    || h->type == bfd_link_hash_defweak)
 543             {
 544               if (bfd_is_abs_section (h->u.def.section))
 545                 result = new_abs (h->u.def.value);
 546               else if (allocation_done == lang_final_phase_enum
 547                        || allocation_done == lang_allocating_phase_enum)
 548                 {
 549                   asection *output_section;
 550
 551                   output_section = h->u.def.section->output_section;
 552                   if (output_section == NULL)
 553                     einfo (_("%X%S: unresolvable symbol `%s' referenced in expression\n"),
 554                            tree->name.name);
 555                   else
 556                     {
 557                       lang_output_section_statement_type *os;
 558
 559                       os = (lang_output_section_statement_lookup
 560                             (bfd_get_section_name (output_bfd,
 561                                                    output_section)));
 562
 563                       /* FIXME: Is this correct if this section is
 564                          being linked with -R?  */
 565                       result = new_rel ((h->u.def.value
 566                                          + h->u.def.section->output_offset),
 567                                         NULL,
 568                                         os);
 569                     }
 570                 }
 571             }
 572           else if (allocation_done == lang_final_phase_enum)
 573             einfo (_("%F%S: undefined symbol `%s' referenced in expression\n"),
 574                    tree->name.name);
 575           else if (h->type == bfd_link_hash_new)
 576             {
 577               h->type = bfd_link_hash_undefined;
 578               h->u.undef.abfd = NULL;
 579               bfd_link_add_undef (link_info.hash, h);
 580             }
 581         }
 582       break;
 583
 584     case ADDR:
 585       if (allocation_done != lang_first_phase_enum)
 586         {
 587           lang_output_section_statement_type *os;
 588
 589           os = lang_output_section_find (tree->name.name);
 590           if (os && os->processed > 0)
 591             result = new_rel (0, NULL, os);
 592         }
 593       break;
 594
 595     case LOADADDR:
 596       if (allocation_done != lang_first_phase_enum)
 597         {
 598           lang_output_section_statement_type *os;
 599
 600           os = lang_output_section_find (tree->name.name);
 601           if (os && os->processed != 0)
 602             {
 603               if (os->load_base == NULL)
 604                 result = new_rel (0, NULL, os);
 605               else
 606                 result = exp_fold_tree_no_dot (os->load_base,
 607                                                abs_output_section,
 608                                                allocation_done);
 609             }
 610         }
 611       break;
 612
 613     case SIZEOF:
 614       if (allocation_done != lang_first_phase_enum)
 615         {
 616           int opb = bfd_octets_per_byte (output_bfd);
 617           lang_output_section_statement_type *os;
 618
 619           os = lang_output_section_find (tree->name.name);
 620           if (os && os->processed > 0)
 621             result = new_abs (os->bfd_section->size / opb);
 622         }
 623       break;
 624
 625     default:
 626       FAIL ();
 627       break;
 628     }
 629
 630   return result;
 631 }
 632
 633 etree_value_type
 634 exp_fold_tree (etree_type *tree,
 635                lang_output_section_statement_type *current_section,
 636                lang_phase_type allocation_done,
 637                bfd_vma dot,
 638                bfd_vma *dotp)
 639 {
 640   etree_value_type result;
 641
 642   if (tree == NULL)
 643     {
 644       result.valid_p = FALSE;
 645       return result;
 646     }
 647
 648   switch (tree->type.node_class)
 649     {
 650     case etree_value:
 651       result = new_rel (tree->value.value, tree->value.str, current_section);
 652       break;
 653
 654     case etree_rel:
 655       if (allocation_done != lang_final_phase_enum)
 656         result.valid_p = FALSE;
 657       else
 658         result = new_rel ((tree->rel.value
 659                            + tree->rel.section->output_section->vma
 660                            + tree->rel.section->output_offset),
 661                           NULL,
 662                           current_section);
 663       break;
 664
 665     case etree_assert:
 666       result = exp_fold_tree (tree->assert_s.child,
 667                               current_section,
 668                               allocation_done, dot, dotp);
 669       if (result.valid_p)
 670         {
 671           if (! result.value)
 672             einfo ("%F%P: %s\n", tree->assert_s.message);
 673           return result;
 674         }
 675       break;
 676
 677     case etree_unary:
 678       result = fold_unary (tree, current_section, allocation_done,
 679                            dot, dotp);
 680       break;
 681
 682     case etree_binary:
 683       result = fold_binary (tree, current_section, allocation_done,
 684                             dot, dotp);
 685       break;
 686
 687     case etree_trinary:
 688       result = fold_trinary (tree, current_section, allocation_done,
 689                              dot, dotp);
 690       break;
 691
 692     case etree_assign:
 693     case etree_provide:
 694     case etree_provided:
 695       if (tree->assign.dst[0] == '.' && tree->assign.dst[1] == 0)
 696         {
 697           /* Assignment to dot can only be done during allocation.  */
 698           if (tree->type.node_class != etree_assign)
 699             einfo (_("%F%S can not PROVIDE assignment to location counter\n"));
 700           if (allocation_done == lang_allocating_phase_enum
 701               || (allocation_done == lang_final_phase_enum
 702                   && current_section == abs_output_section))
 703             {
 704               result = exp_fold_tree (tree->assign.src,
 705                                       current_section,
 706                                       allocation_done, dot,
 707                                       dotp);
 708               if (! result.valid_p)
 709                 einfo (_("%F%S invalid assignment to location counter\n"));
 710               else
 711                 {
 712                   if (current_section == NULL)
 713                     einfo (_("%F%S assignment to location counter invalid outside of SECTION\n"));
 714                   else
 715                     {
 716                       bfd_vma nextdot;
 717
 718                       nextdot = (result.value
 719                                  + current_section->bfd_section->vma);
 720                       if (nextdot < dot
 721                           && current_section != abs_output_section)
 722                         einfo (_("%F%S cannot move location counter backwards (from %V to %V)\n"),
 723                                dot, nextdot);
 724                       else
 725                         *dotp = nextdot;
 726                     }
 727                 }
 728             }
 729         }
 730       else
 731         {
 732           result = exp_fold_tree (tree->assign.src,
 733                                   current_section, allocation_done,
 734                                   dot, dotp);
 735           if (result.valid_p)
 736             {
 737               bfd_boolean create;
 738               struct bfd_link_hash_entry *h;
 739
 740               if (tree->type.node_class == etree_assign)
 741                 create = TRUE;
 742               else
 743                 create = FALSE;
 744               h = bfd_link_hash_lookup (link_info.hash, tree->assign.dst,
 745                                         create, FALSE, TRUE);
 746               if (h == NULL)
 747                 {
 748                   if (create)
 749                     einfo (_("%P%F:%s: hash creation failed\n"),
 750                            tree->assign.dst);
 751                 }
 752               else if (tree->type.node_class == etree_provide
 753                        && h->type != bfd_link_hash_new
 754                        && h->type != bfd_link_hash_undefined
 755                        && h->type != bfd_link_hash_common)
 756                 {
 757                   /* Do nothing.  The symbol was defined by some
 758                      object.  */
 759                 }
 760               else
 761                 {
 762                   /* FIXME: Should we worry if the symbol is already
 763                      defined?  */
 764                   lang_update_definedness (tree->assign.dst, h);
 765                   h->type = bfd_link_hash_defined;
 766                   h->u.def.value = result.value;
 767                   h->u.def.section = result.section->bfd_section;
 768                   if (tree->type.node_class == etree_provide)
 769                     tree->type.node_class = etree_provided;
 770                 }
 771             }
 772         }
 773       break;
 774
 775     case etree_name:
 776       result = fold_name (tree, current_section, allocation_done, dot);
 777       break;
 778
 779     default:
 780       FAIL ();
 781       break;
 782     }
 783
 784   return result;
 785 }
 786
 787 static etree_value_type
 788 exp_fold_tree_no_dot (etree_type *tree,
 789                       lang_output_section_statement_type *current_section,
 790                       lang_phase_type allocation_done)
 791 {
 792   return exp_fold_tree (tree, current_section, allocation_done, 0, NULL);
 793 }
 794
 795 etree_type *
 796 exp_binop (int code, etree_type *lhs, etree_type *rhs)
 797 {
 798   etree_type value, *new;
 799   etree_value_type r;
 800
 801   value.type.node_code = code;
 802   value.binary.lhs = lhs;
 803   value.binary.rhs = rhs;
 804   value.type.node_class = etree_binary;
 805   r = exp_fold_tree_no_dot (&value,
 806                             abs_output_section,
 807                             lang_first_phase_enum);
 808   if (r.valid_p)
 809     {
 810       return exp_intop (r.value);
 811     }
 812   new = stat_alloc (sizeof (new->binary));
 813   memcpy (new, &value, sizeof (new->binary));
 814   return new;
 815 }
 816
 817 etree_type *
 818 exp_trinop (int code, etree_type *cond, etree_type *lhs, etree_type *rhs)
 819 {
 820   etree_type value, *new;
 821   etree_value_type r;
 822   value.type.node_code = code;
 823   value.trinary.lhs = lhs;
 824   value.trinary.cond = cond;
 825   value.trinary.rhs = rhs;
 826   value.type.node_class = etree_trinary;
 827   r = exp_fold_tree_no_dot (&value, NULL, lang_first_phase_enum);
 828   if (r.valid_p)
 829     return exp_intop (r.value);
 830
 831   new = stat_alloc (sizeof (new->trinary));
 832   memcpy (new, &value, sizeof (new->trinary));
 833   return new;
 834 }
 835
 836 etree_type *
 837 exp_unop (int code, etree_type *child)
 838 {
 839   etree_type value, *new;
 840
 841   etree_value_type r;
 842   value.unary.type.node_code = code;
 843   value.unary.child = child;
 844   value.unary.type.node_class = etree_unary;
 845   r = exp_fold_tree_no_dot (&value, abs_output_section,
 846                             lang_first_phase_enum);
 847   if (r.valid_p)
 848     return exp_intop (r.value);
 849
 850   new = stat_alloc (sizeof (new->unary));
 851   memcpy (new, &value, sizeof (new->unary));
 852   return new;
 853 }
 854
 855 etree_type *
 856 exp_nameop (int code, const char *name)
 857 {
 858   etree_type value, *new;
 859   etree_value_type r;
 860   value.name.type.node_code = code;
 861   value.name.name = name;
 862   value.name.type.node_class = etree_name;
 863
 864   r = exp_fold_tree_no_dot (&value, NULL, lang_first_phase_enum);
 865   if (r.valid_p)
 866     return exp_intop (r.value);
 867
 868   new = stat_alloc (sizeof (new->name));
 869   memcpy (new, &value, sizeof (new->name));
 870   return new;
 871
 872 }
 873
 874 etree_type *
 875 exp_assop (int code, const char *dst, etree_type *src)
 876 {
 877   etree_type value, *new;
 878
 879   value.assign.type.node_code = code;
 880
 881   value.assign.src = src;
 882   value.assign.dst = dst;
 883   value.assign.type.node_class = etree_assign;
 884
 885 #if 0
 886   if (exp_fold_tree_no_dot (&value, &result))
 887     return exp_intop (result);
 888 #endif
 889   new = stat_alloc (sizeof (new->assign));
 890   memcpy (new, &value, sizeof (new->assign));
 891   return new;
 892 }
 893
 894 /* Handle PROVIDE.  */
 895
 896 etree_type *
 897 exp_provide (const char *dst, etree_type *src)
 898 {
 899   etree_type *n;
 900
 901   n = stat_alloc (sizeof (n->assign));
 902   n->assign.type.node_code = '=';
 903   n->assign.type.node_class = etree_provide;
 904   n->assign.src = src;
 905   n->assign.dst = dst;
 906   return n;
 907 }
 908
 909 /* Handle ASSERT.  */
 910
 911 etree_type *
 912 exp_assert (etree_type *exp, const char *message)
 913 {
 914   etree_type *n;
 915
 916   n = stat_alloc (sizeof (n->assert_s));
 917   n->assert_s.type.node_code = '!';
 918   n->assert_s.type.node_class = etree_assert;
 919   n->assert_s.child = exp;
 920   n->assert_s.message = message;
 921   return n;
 922 }
 923
 924 void
 925 exp_print_tree (etree_type *tree)
 926 {
 927   if (config.map_file == NULL)
 928     config.map_file = stderr;
 929
 930   if (tree == NULL)
 931     {
 932       minfo ("NULL TREE\n");
 933       return;
 934     }
 935
 936   switch (tree->type.node_class)
 937     {
 938     case etree_value:
 939       minfo ("0x%v", tree->value.value);
 940       return;
 941     case etree_rel:
 942       if (tree->rel.section->owner != NULL)
 943         minfo ("%B:", tree->rel.section->owner);
 944       minfo ("%s+0x%v", tree->rel.section->name, tree->rel.value);
 945       return;
 946     case etree_assign:
 947 #if 0
 948       if (tree->assign.dst->sdefs != NULL)
 949         fprintf (config.map_file, "%s (%x) ", tree->assign.dst->name,
 950                  tree->assign.dst->sdefs->value);
 951       else
 952         fprintf (config.map_file, "%s (UNDEFINED)", tree->assign.dst->name);
 953 #endif
 954       fprintf (config.map_file, "%s", tree->assign.dst);
 955       exp_print_token (tree->type.node_code, TRUE);
 956       exp_print_tree (tree->assign.src);
 957       break;
 958     case etree_provide:
 959     case etree_provided:
 960       fprintf (config.map_file, "PROVIDE (%s, ", tree->assign.dst);
 961       exp_print_tree (tree->assign.src);
 962       fprintf (config.map_file, ")");
 963       break;
 964     case etree_binary:
 965       fprintf (config.map_file, "(");
 966       exp_print_tree (tree->binary.lhs);
 967       exp_print_token (tree->type.node_code, TRUE);
 968       exp_print_tree (tree->binary.rhs);
 969       fprintf (config.map_file, ")");
 970       break;
 971     case etree_trinary:
 972       exp_print_tree (tree->trinary.cond);
 973       fprintf (config.map_file, "?");
 974       exp_print_tree (tree->trinary.lhs);
 975       fprintf (config.map_file, ":");
 976       exp_print_tree (tree->trinary.rhs);
 977       break;
 978     case etree_unary:
 979       exp_print_token (tree->unary.type.node_code, FALSE);
 980       if (tree->unary.child)
 981         {
 982           fprintf (config.map_file, " (");
 983           exp_print_tree (tree->unary.child);
 984           fprintf (config.map_file, ")");
 985         }
 986       break;
 987
 988     case etree_assert:
 989       fprintf (config.map_file, "ASSERT (");
 990       exp_print_tree (tree->assert_s.child);
 991       fprintf (config.map_file, ", %s)", tree->assert_s.message);
 992       break;
 993
 994     case etree_undef:
 995       fprintf (config.map_file, "????????");
 996       break;
 997     case etree_name:
 998       if (tree->type.node_code == NAME)
 999         {
1000           fprintf (config.map_file, "%s", tree->name.name);
1001         }
1002       else
1003         {
1004           exp_print_token (tree->type.node_code, FALSE);
1005           if (tree->name.name)
1006             fprintf (config.map_file, " (%s)", tree->name.name);
1007         }
1008       break;
1009     default:
1010       FAIL ();
1011       break;
1012     }
1013 }
1014
1015 bfd_vma
1016 exp_get_vma (etree_type *tree,
1017              bfd_vma def,
1018              char *name,
1019              lang_phase_type allocation_done)
1020 {
1021   etree_value_type r;
1022
1023   if (tree != NULL)
1024     {
1025       r = exp_fold_tree_no_dot (tree, abs_output_section, allocation_done);
1026       if (! r.valid_p && name != NULL)
1027         einfo (_("%F%S nonconstant expression for %s\n"), name);
1028       return r.value;
1029     }
1030   else
1031     return def;
1032 }
1033
1034 int
1035 exp_get_value_int (etree_type *tree,
1036                    int def,
1037                    char *name,
1038                    lang_phase_type allocation_done)
1039 {
1040   return exp_get_vma (tree, def, name, allocation_done);
1041 }
1042
1043 fill_type *
1044 exp_get_fill (etree_type *tree,
1045               fill_type *def,
1046               char *name,
1047               lang_phase_type allocation_done)
1048 {
1049   fill_type *fill;
1050   etree_value_type r;
1051   size_t len;
1052   unsigned int val;
1053
1054   if (tree == NULL)
1055     return def;
1056
1057   r = exp_fold_tree_no_dot (tree, abs_output_section, allocation_done);
1058   if (! r.valid_p && name != NULL)
1059     einfo (_("%F%S nonconstant expression for %s\n"), name);
1060
1061   if (r.str != NULL && (len = strlen (r.str)) != 0)
1062     {
1063       unsigned char *dst;
1064       unsigned char *s;
1065       fill = xmalloc ((len + 1) / 2 + sizeof (*fill) - 1);
1066       fill->size = (len + 1) / 2;
1067       dst = fill->data;
1068       s = r.str;
1069       val = 0;
1070       do
1071         {
1072           unsigned int digit;
1073
1074           digit = *s++ - '0';
1075           if (digit > 9)
1076             digit = (digit - 'A' + '0' + 10) & 0xf;
1077           val <<= 4;
1078           val += digit;
1079           --len;
1080           if ((len & 1) == 0)
1081             {
1082               *dst++ = val;
1083               val = 0;
1084             }
1085         }
1086       while (len != 0);
1087     }
1088   else
1089     {
1090       fill = xmalloc (4 + sizeof (*fill) - 1);
1091       val = r.value;
1092       fill->data[0] = (val >> 24) & 0xff;
1093       fill->data[1] = (val >> 16) & 0xff;
1094       fill->data[2] = (val >>  8) & 0xff;
1095       fill->data[3] = (val >>  0) & 0xff;
1096       fill->size = 4;
1097     }
1098   return fill;
1099 }
1100
1101 bfd_vma
1102 exp_get_abs_int (etree_type *tree,
1103                  int def ATTRIBUTE_UNUSED,
1104                  char *name,
1105                  lang_phase_type allocation_done)
1106 {
1107   etree_value_type res;
1108   res = exp_fold_tree_no_dot (tree, abs_output_section, allocation_done);
1109
1110   if (res.valid_p)
1111     res.value += res.section->bfd_section->vma;
1112   else
1113     einfo (_("%F%S non constant expression for %s\n"), name);
1114
1115   return res.value;
1116 }
1117
1118 static bfd_vma
1119 align_n (bfd_vma value, bfd_vma align)
1120 {
1121   if (align <= 1)
1122     return value;
1123
1124   value = (value + align - 1) / align;
1125   return value * align;
1126 }