ld/ldexp.c

   1 /* This module handles expression trees.
   2    Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
   3    2001
   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
  43 static void exp_print_token PARAMS ((token_code_type code));
  44 static void make_abs PARAMS ((etree_value_type *ptr));
  45 static etree_value_type new_abs PARAMS ((bfd_vma value));
  46 static void check PARAMS ((lang_output_section_statement_type *os,
  47                            const char *name, const char *op));
  48 static etree_value_type new_rel
  49   PARAMS ((bfd_vma value, lang_output_section_statement_type *section));
  50 static etree_value_type new_rel_from_section
  51   PARAMS ((bfd_vma value, lang_output_section_statement_type *section));
  52 static etree_value_type fold_binary
  53   PARAMS ((etree_type *tree,
  54            lang_output_section_statement_type *current_section,
  55            lang_phase_type allocation_done,
  56            bfd_vma dot, bfd_vma *dotp));
  57 static etree_value_type fold_name
  58   PARAMS ((etree_type *tree,
  59            lang_output_section_statement_type *current_section,
  60            lang_phase_type allocation_done,
  61            bfd_vma dot));
  62 static etree_value_type exp_fold_tree_no_dot
  63   PARAMS ((etree_type *tree,
  64            lang_output_section_statement_type *current_section,
  65            lang_phase_type allocation_done));
  66
  67 static void
  68 exp_print_token (code)
  69      token_code_type code;
  70 {
  71   static CONST struct
  72   {
  73     token_code_type code;
  74     char * name;
  75   }
  76   table[] =
  77   {
  78     { INT, "int" },
  79     { NAME, "NAME" },
  80     { PLUSEQ, "+=" },
  81     { MINUSEQ, "-=" },
  82     { MULTEQ, "*=" },
  83     { DIVEQ, "/=" },
  84     { LSHIFTEQ, "<<=" },
  85     { RSHIFTEQ, ">>=" },
  86     { ANDEQ, "&=" },
  87     { OREQ, "|=" },
  88     { OROR, "||" },
  89     { ANDAND, "&&" },
  90     { EQ, "==" },
  91     { NE, "!=" },
  92     { LE, "<=" },
  93     { GE, ">=" },
  94     { LSHIFT, "<<" },
  95     { RSHIFT, ">>=" },
  96     { ALIGN_K, "ALIGN" },
  97     { BLOCK, "BLOCK" },
  98     { QUAD, "QUAD" },
  99     { SQUAD, "SQUAD" },
 100     { LONG, "LONG" },
 101     { SHORT, "SHORT" },
 102     { BYTE, "BYTE" },
 103     { SECTIONS, "SECTIONS" },
 104     { SIZEOF_HEADERS, "SIZEOF_HEADERS" },
 105     { MEMORY, "MEMORY" },
 106     { DEFINED, "DEFINED" },
 107     { TARGET_K, "TARGET" },
 108     { SEARCH_DIR, "SEARCH_DIR" },
 109     { MAP, "MAP" },
 110     { ENTRY, "ENTRY" },
 111     { NEXT, "NEXT" },
 112     { SIZEOF, "SIZEOF" },
 113     { ADDR, "ADDR" },
 114     { LOADADDR, "LOADADDR" },
 115     { MAX_K, "MAX_K" },
 116     { REL, "relocateable" },
 117   };
 118   unsigned int idx;
 119
 120   for (idx = ARRAY_SIZE (table); idx--;)
 121     {
 122       if (table[idx].code == code)
 123         {
 124           fprintf (config.map_file, " %s ", table[idx].name);
 125           return;
 126         }
 127     }
 128
 129   /* Not in table, just print it alone.  */
 130   if (code < 127)
 131     fprintf (config.map_file, " %c ", code);
 132   else
 133     fprintf (config.map_file, " <code %d> ", code);
 134 }
 135
 136 static void
 137 make_abs (ptr)
 138      etree_value_type *ptr;
 139 {
 140   asection *s = ptr->section->bfd_section;
 141   ptr->value += s->vma;
 142   ptr->section = abs_output_section;
 143 }
 144
 145 static etree_value_type
 146 new_abs (value)
 147      bfd_vma value;
 148 {
 149   etree_value_type new;
 150   new.valid_p = true;
 151   new.section = abs_output_section;
 152   new.value = value;
 153   return new;
 154 }
 155
 156 static void
 157 check (os, name, op)
 158      lang_output_section_statement_type *os;
 159      const char *name;
 160      const char *op;
 161 {
 162   if (os == NULL)
 163     einfo (_("%F%P: %s uses undefined section %s\n"), op, name);
 164   if (! os->processed)
 165     einfo (_("%F%P: %s forward reference of section %s\n"), op, name);
 166 }
 167
 168 etree_type *
 169 exp_intop (value)
 170      bfd_vma value;
 171 {
 172   etree_type *new = (etree_type *) stat_alloc (sizeof (new->value));
 173   new->type.node_code = INT;
 174   new->value.value = value;
 175   new->type.node_class = etree_value;
 176   return new;
 177
 178 }
 179
 180 /* Build an expression representing an unnamed relocateable value.  */
 181
 182 etree_type *
 183 exp_relop (section, value)
 184      asection *section;
 185      bfd_vma value;
 186 {
 187   etree_type *new = (etree_type *) stat_alloc (sizeof (new->rel));
 188   new->type.node_code = REL;
 189   new->type.node_class = etree_rel;
 190   new->rel.section = section;
 191   new->rel.value = value;
 192   return new;
 193 }
 194
 195 static etree_value_type
 196 new_rel (value, section)
 197      bfd_vma value;
 198      lang_output_section_statement_type *section;
 199 {
 200   etree_value_type new;
 201   new.valid_p = true;
 202   new.value = value;
 203   new.section = section;
 204   return new;
 205 }
 206
 207 static etree_value_type
 208 new_rel_from_section (value, section)
 209      bfd_vma value;
 210      lang_output_section_statement_type *section;
 211 {
 212   etree_value_type new;
 213   new.valid_p = true;
 214   new.value = value;
 215   new.section = section;
 216
 217   new.value -= section->bfd_section->vma;
 218
 219   return new;
 220 }
 221
 222 static etree_value_type
 223 fold_binary (tree, current_section, allocation_done, dot, dotp)
 224      etree_type *tree;
 225      lang_output_section_statement_type *current_section;
 226      lang_phase_type allocation_done;
 227      bfd_vma dot;
 228      bfd_vma *dotp;
 229 {
 230   etree_value_type result;
 231
 232   result = exp_fold_tree (tree->binary.lhs, current_section,
 233                           allocation_done, dot, dotp);
 234   if (result.valid_p)
 235     {
 236       etree_value_type other;
 237
 238       other = exp_fold_tree (tree->binary.rhs,
 239                              current_section,
 240                              allocation_done, dot, dotp);
 241       if (other.valid_p)
 242         {
 243           /* If the values are from different sections, or this is an
 244              absolute expression, make both the source arguments
 245              absolute.  However, adding or subtracting an absolute
 246              value from a relative value is meaningful, and is an
 247              exception.  */
 248           if (current_section != abs_output_section
 249               && (other.section == abs_output_section
 250                   || (result.section == abs_output_section
 251                       && tree->type.node_code == '+'))
 252               && (tree->type.node_code == '+'
 253                   || tree->type.node_code == '-'))
 254             {
 255               etree_value_type hold;
 256
 257               /* If there is only one absolute term, make sure it is the
 258                  second one.  */
 259               if (other.section != abs_output_section)
 260                 {
 261                   hold = result;
 262                   result = other;
 263                   other = hold;
 264                 }
 265             }
 266           else if (result.section != other.section
 267                    || current_section == abs_output_section)
 268             {
 269               make_abs (&result);
 270               make_abs (&other);
 271             }
 272
 273           switch (tree->type.node_code)
 274             {
 275             case '%':
 276               if (other.value == 0)
 277                 einfo (_("%F%S %% by zero\n"));
 278               result.value = ((bfd_signed_vma) result.value
 279                               % (bfd_signed_vma) other.value);
 280               break;
 281
 282             case '/':
 283               if (other.value == 0)
 284                 einfo (_("%F%S / by zero\n"));
 285               result.value = ((bfd_signed_vma) result.value
 286                               / (bfd_signed_vma) other.value);
 287               break;
 288
 289 #define BOP(x,y) case x : result.value = result.value y other.value; break;
 290               BOP ('+', +);
 291               BOP ('*', *);
 292               BOP ('-', -);
 293               BOP (LSHIFT, <<);
 294               BOP (RSHIFT, >>);
 295               BOP (EQ, ==);
 296               BOP (NE, !=);
 297               BOP ('<', <);
 298               BOP ('>', >);
 299               BOP (LE, <=);
 300               BOP (GE, >=);
 301               BOP ('&', &);
 302               BOP ('^', ^);
 303               BOP ('|', |);
 304               BOP (ANDAND, &&);
 305               BOP (OROR, ||);
 306
 307             case MAX_K:
 308               if (result.value < other.value)
 309                 result = other;
 310               break;
 311
 312             case MIN_K:
 313               if (result.value > other.value)
 314                 result = other;
 315               break;
 316
 317             default:
 318               FAIL ();
 319             }
 320         }
 321       else
 322         {
 323           result.valid_p = false;
 324         }
 325     }
 326
 327   return result;
 328 }
 329
 330 etree_value_type
 331 invalid ()
 332 {
 333   etree_value_type new;
 334   new.valid_p = false;
 335   return new;
 336 }
 337
 338 static etree_value_type
 339 fold_name (tree, current_section, allocation_done, dot)
 340      etree_type *tree;
 341      lang_output_section_statement_type *current_section;
 342      lang_phase_type allocation_done;
 343      bfd_vma dot;
 344 {
 345   etree_value_type result;
 346
 347   switch (tree->type.node_code)
 348     {
 349     case SIZEOF_HEADERS:
 350       if (allocation_done != lang_first_phase_enum)
 351         {
 352           result = new_abs ((bfd_vma)
 353                             bfd_sizeof_headers (output_bfd,
 354                                                 link_info.relocateable));
 355         }
 356       else
 357         {
 358           result.valid_p = false;
 359         }
 360       break;
 361     case DEFINED:
 362       if (allocation_done == lang_first_phase_enum)
 363         result.valid_p = false;
 364       else
 365         {
 366           struct bfd_link_hash_entry *h;
 367
 368           h = bfd_wrapped_link_hash_lookup (output_bfd, &link_info,
 369                                             tree->name.name,
 370                                             false, false, true);
 371           result.value = (h != (struct bfd_link_hash_entry *) NULL
 372                           && (h->type == bfd_link_hash_defined
 373                               || h->type == bfd_link_hash_defweak
 374                               || h->type == bfd_link_hash_common));
 375           result.section = 0;
 376           result.valid_p = true;
 377         }
 378       break;
 379     case NAME:
 380       result.valid_p = false;
 381       if (tree->name.name[0] == '.' && tree->name.name[1] == 0)
 382         {
 383           if (allocation_done != lang_first_phase_enum)
 384             result = new_rel_from_section (dot, current_section);
 385           else
 386             result = invalid ();
 387         }
 388       else if (allocation_done != lang_first_phase_enum)
 389         {
 390           struct bfd_link_hash_entry *h;
 391
 392           h = bfd_wrapped_link_hash_lookup (output_bfd, &link_info,
 393                                             tree->name.name,
 394                                             false, false, true);
 395           if (h != NULL
 396               && (h->type == bfd_link_hash_defined
 397                   || h->type == bfd_link_hash_defweak))
 398             {
 399               if (bfd_is_abs_section (h->u.def.section))
 400                 result = new_abs (h->u.def.value);
 401               else if (allocation_done == lang_final_phase_enum
 402                        || allocation_done == lang_allocating_phase_enum)
 403                 {
 404                   asection *output_section;
 405
 406                   output_section = h->u.def.section->output_section;
 407                   if (output_section == NULL)
 408                     einfo (_("%X%S: unresolvable symbol `%s' referenced in expression\n"),
 409                            tree->name.name);
 410                   else
 411                     {
 412                       lang_output_section_statement_type *os;
 413
 414                       os = (lang_output_section_statement_lookup
 415                             (bfd_get_section_name (output_bfd,
 416                                                    output_section)));
 417
 418                       /* FIXME: Is this correct if this section is
 419                          being linked with -R?  */
 420                       result = new_rel ((h->u.def.value
 421                                          + h->u.def.section->output_offset),
 422                                         os);
 423                     }
 424                 }
 425             }
 426           else if (allocation_done == lang_final_phase_enum)
 427             einfo (_("%F%S: undefined symbol `%s' referenced in expression\n"),
 428                    tree->name.name);
 429         }
 430       break;
 431
 432     case ADDR:
 433       if (allocation_done != lang_first_phase_enum)
 434         {
 435           lang_output_section_statement_type *os;
 436
 437           os = lang_output_section_find (tree->name.name);
 438           check (os, tree->name.name, "ADDR");
 439           result = new_rel (0, os);
 440         }
 441       else
 442         result = invalid ();
 443       break;
 444
 445     case LOADADDR:
 446       if (allocation_done != lang_first_phase_enum)
 447         {
 448           lang_output_section_statement_type *os;
 449
 450           os = lang_output_section_find (tree->name.name);
 451           check (os, tree->name.name, "LOADADDR");
 452           if (os->load_base == NULL)
 453             result = new_rel (0, os);
 454           else
 455             result = exp_fold_tree_no_dot (os->load_base,
 456                                            abs_output_section,
 457                                            allocation_done);
 458         }
 459       else
 460         result = invalid ();
 461       break;
 462
 463     case SIZEOF:
 464       if (allocation_done != lang_first_phase_enum)
 465         {
 466           int opb = bfd_octets_per_byte (output_bfd);
 467           lang_output_section_statement_type *os;
 468
 469           os = lang_output_section_find (tree->name.name);
 470           check (os, tree->name.name, "SIZEOF");
 471           result = new_abs (os->bfd_section->_raw_size / opb);
 472         }
 473       else
 474         result = invalid ();
 475       break;
 476
 477     default:
 478       FAIL ();
 479       break;
 480     }
 481
 482   return result;
 483 }
 484
 485 etree_value_type
 486 exp_fold_tree (tree, current_section, allocation_done, dot, dotp)
 487      etree_type *tree;
 488      lang_output_section_statement_type *current_section;
 489      lang_phase_type allocation_done;
 490      bfd_vma dot;
 491      bfd_vma *dotp;
 492 {
 493   etree_value_type result;
 494
 495   if (tree == NULL)
 496     {
 497       result.valid_p = false;
 498       return result;
 499     }
 500
 501   switch (tree->type.node_class)
 502     {
 503     case etree_value:
 504       result = new_rel (tree->value.value, current_section);
 505       break;
 506
 507     case etree_rel:
 508       if (allocation_done != lang_final_phase_enum)
 509         result.valid_p = false;
 510       else
 511         result = new_rel ((tree->rel.value
 512                            + tree->rel.section->output_section->vma
 513                            + tree->rel.section->output_offset),
 514                           current_section);
 515       break;
 516
 517     case etree_assert:
 518       result = exp_fold_tree (tree->assert_s.child,
 519                               current_section,
 520                               allocation_done, dot, dotp);
 521       if (result.valid_p)
 522         {
 523           if (! result.value)
 524             einfo ("%F%P: %s\n", tree->assert_s.message);
 525           return result;
 526         }
 527       break;
 528
 529     case etree_unary:
 530       result = exp_fold_tree (tree->unary.child,
 531                               current_section,
 532                               allocation_done, dot, dotp);
 533       if (result.valid_p)
 534         {
 535           switch (tree->type.node_code)
 536             {
 537             case ALIGN_K:
 538               if (allocation_done != lang_first_phase_enum)
 539                 result = new_rel_from_section (ALIGN_N (dot, result.value),
 540                                                current_section);
 541               else
 542                 result.valid_p = false;
 543               break;
 544
 545             case ABSOLUTE:
 546               if (allocation_done != lang_first_phase_enum && result.valid_p)
 547                 {
 548                   result.value += result.section->bfd_section->vma;
 549                   result.section = abs_output_section;
 550                 }
 551               else
 552                 result.valid_p = false;
 553               break;
 554
 555             case '~':
 556               make_abs (&result);
 557               result.value = ~result.value;
 558               break;
 559
 560             case '!':
 561               make_abs (&result);
 562               result.value = !result.value;
 563               break;
 564
 565             case '-':
 566               make_abs (&result);
 567               result.value = -result.value;
 568               break;
 569
 570             case NEXT:
 571               /* Return next place aligned to value.  */
 572               if (allocation_done == lang_allocating_phase_enum)
 573                 {
 574                   make_abs (&result);
 575                   result.value = ALIGN_N (dot, result.value);
 576                 }
 577               else
 578                 result.valid_p = false;
 579               break;
 580
 581             default:
 582               FAIL ();
 583               break;
 584             }
 585         }
 586       break;
 587
 588     case etree_trinary:
 589       result = exp_fold_tree (tree->trinary.cond, current_section,
 590                               allocation_done, dot, dotp);
 591       if (result.valid_p)
 592         result = exp_fold_tree ((result.value
 593                                  ? tree->trinary.lhs
 594                                  : tree->trinary.rhs),
 595                                 current_section,
 596                                 allocation_done, dot, dotp);
 597       break;
 598
 599     case etree_binary:
 600       result = fold_binary (tree, current_section, allocation_done,
 601                             dot, dotp);
 602       break;
 603
 604     case etree_assign:
 605     case etree_provide:
 606     case etree_provided:
 607       if (tree->assign.dst[0] == '.' && tree->assign.dst[1] == 0)
 608         {
 609           /* Assignment to dot can only be done during allocation.  */
 610           if (tree->type.node_class != etree_assign)
 611             einfo (_("%F%S can not PROVIDE assignment to location counter\n"));
 612           if (allocation_done == lang_allocating_phase_enum
 613               || (allocation_done == lang_final_phase_enum
 614                   && current_section == abs_output_section))
 615             {
 616               result = exp_fold_tree (tree->assign.src,
 617                                       current_section,
 618                                       lang_allocating_phase_enum, dot,
 619                                       dotp);
 620               if (! result.valid_p)
 621                 einfo (_("%F%S invalid assignment to location counter\n"));
 622               else
 623                 {
 624                   if (current_section == NULL)
 625                     einfo (_("%F%S assignment to location counter invalid outside of SECTION\n"));
 626                   else
 627                     {
 628                       bfd_vma nextdot;
 629
 630                       nextdot = (result.value
 631                                  + current_section->bfd_section->vma);
 632                       if (nextdot < dot
 633                           && current_section != abs_output_section)
 634                         einfo (_("%F%S cannot move location counter backwards (from %V to %V)\n"),
 635                                dot, nextdot);
 636                       else
 637                         *dotp = nextdot;
 638                     }
 639                 }
 640             }
 641         }
 642       else
 643         {
 644           result = exp_fold_tree (tree->assign.src,
 645                                   current_section, allocation_done,
 646                                   dot, dotp);
 647           if (result.valid_p)
 648             {
 649               boolean create;
 650               struct bfd_link_hash_entry *h;
 651
 652               if (tree->type.node_class == etree_assign)
 653                 create = true;
 654               else
 655                 create = false;
 656               h = bfd_link_hash_lookup (link_info.hash, tree->assign.dst,
 657                                         create, false, false);
 658               if (h == (struct bfd_link_hash_entry *) NULL)
 659                 {
 660                   if (tree->type.node_class == etree_assign)
 661                     einfo (_("%P%F:%s: hash creation failed\n"),
 662                            tree->assign.dst);
 663                 }
 664               else if (tree->type.node_class == etree_provide
 665                        && h->type != bfd_link_hash_undefined
 666                        && h->type != bfd_link_hash_common)
 667                 {
 668                   /* Do nothing.  The symbol was defined by some
 669                      object.  */
 670                 }
 671               else
 672                 {
 673                   /* FIXME: Should we worry if the symbol is already
 674                      defined?  */
 675                   h->type = bfd_link_hash_defined;
 676                   h->u.def.value = result.value;
 677                   h->u.def.section = result.section->bfd_section;
 678                   if (tree->type.node_class == etree_provide)
 679                     tree->type.node_class = etree_provided;
 680                 }
 681             }
 682         }
 683       break;
 684
 685     case etree_name:
 686       result = fold_name (tree, current_section, allocation_done, dot);
 687       break;
 688
 689     default:
 690       FAIL ();
 691       break;
 692     }
 693
 694   return result;
 695 }
 696
 697 static etree_value_type
 698 exp_fold_tree_no_dot (tree, current_section, allocation_done)
 699      etree_type *tree;
 700      lang_output_section_statement_type *current_section;
 701      lang_phase_type allocation_done;
 702 {
 703   return exp_fold_tree (tree, current_section, allocation_done,
 704                         (bfd_vma) 0, (bfd_vma *) NULL);
 705 }
 706
 707 etree_type *
 708 exp_binop (code, lhs, rhs)
 709      int code;
 710      etree_type *lhs;
 711      etree_type *rhs;
 712 {
 713   etree_type value, *new;
 714   etree_value_type r;
 715
 716   value.type.node_code = code;
 717   value.binary.lhs = lhs;
 718   value.binary.rhs = rhs;
 719   value.type.node_class = etree_binary;
 720   r = exp_fold_tree_no_dot (&value,
 721                             abs_output_section,
 722                             lang_first_phase_enum);
 723   if (r.valid_p)
 724     {
 725       return exp_intop (r.value);
 726     }
 727   new = (etree_type *) stat_alloc (sizeof (new->binary));
 728   memcpy ((char *) new, (char *) &value, sizeof (new->binary));
 729   return new;
 730 }
 731
 732 etree_type *
 733 exp_trinop (code, cond, lhs, rhs)
 734      int code;
 735      etree_type *cond;
 736      etree_type *lhs;
 737      etree_type *rhs;
 738 {
 739   etree_type value, *new;
 740   etree_value_type r;
 741   value.type.node_code = code;
 742   value.trinary.lhs = lhs;
 743   value.trinary.cond = cond;
 744   value.trinary.rhs = rhs;
 745   value.type.node_class = etree_trinary;
 746   r = exp_fold_tree_no_dot (&value,
 747                             (lang_output_section_statement_type *) NULL,
 748                             lang_first_phase_enum);
 749   if (r.valid_p)
 750     return exp_intop (r.value);
 751
 752   new = (etree_type *) stat_alloc (sizeof (new->trinary));
 753   memcpy ((char *) new, (char *) &value, sizeof (new->trinary));
 754   return new;
 755 }
 756
 757 etree_type *
 758 exp_unop (code, child)
 759      int code;
 760      etree_type *child;
 761 {
 762   etree_type value, *new;
 763
 764   etree_value_type r;
 765   value.unary.type.node_code = code;
 766   value.unary.child = child;
 767   value.unary.type.node_class = etree_unary;
 768   r = exp_fold_tree_no_dot (&value, abs_output_section,
 769                             lang_first_phase_enum);
 770   if (r.valid_p)
 771     return exp_intop (r.value);
 772
 773   new = (etree_type *) stat_alloc (sizeof (new->unary));
 774   memcpy ((char *) new, (char *) &value, sizeof (new->unary));
 775   return new;
 776 }
 777
 778 etree_type *
 779 exp_nameop (code, name)
 780      int code;
 781      CONST char *name;
 782 {
 783   etree_type value, *new;
 784   etree_value_type r;
 785   value.name.type.node_code = code;
 786   value.name.name = name;
 787   value.name.type.node_class = etree_name;
 788
 789   r = exp_fold_tree_no_dot (&value,
 790                             (lang_output_section_statement_type *) NULL,
 791                             lang_first_phase_enum);
 792   if (r.valid_p)
 793     return exp_intop (r.value);
 794
 795   new = (etree_type *) stat_alloc (sizeof (new->name));
 796   memcpy ((char *) new, (char *) &value, sizeof (new->name));
 797   return new;
 798
 799 }
 800
 801 etree_type *
 802 exp_assop (code, dst, src)
 803      int code;
 804      CONST char *dst;
 805      etree_type *src;
 806 {
 807   etree_type value, *new;
 808
 809   value.assign.type.node_code = code;
 810
 811   value.assign.src = src;
 812   value.assign.dst = dst;
 813   value.assign.type.node_class = etree_assign;
 814
 815 #if 0
 816   if (exp_fold_tree_no_dot (&value, &result))
 817     return exp_intop (result);
 818 #endif
 819   new = (etree_type *) stat_alloc (sizeof (new->assign));
 820   memcpy ((char *) new, (char *) &value, sizeof (new->assign));
 821   return new;
 822 }
 823
 824 /* Handle PROVIDE.  */
 825
 826 etree_type *
 827 exp_provide (dst, src)
 828      const char *dst;
 829      etree_type *src;
 830 {
 831   etree_type *n;
 832
 833   n = (etree_type *) stat_alloc (sizeof (n->assign));
 834   n->assign.type.node_code = '=';
 835   n->assign.type.node_class = etree_provide;
 836   n->assign.src = src;
 837   n->assign.dst = dst;
 838   return n;
 839 }
 840
 841 /* Handle ASSERT.  */
 842
 843 etree_type *
 844 exp_assert (exp, message)
 845      etree_type *exp;
 846      const char *message;
 847 {
 848   etree_type *n;
 849
 850   n = (etree_type *) stat_alloc (sizeof (n->assert_s));
 851   n->assert_s.type.node_code = '!';
 852   n->assert_s.type.node_class = etree_assert;
 853   n->assert_s.child = exp;
 854   n->assert_s.message = message;
 855   return n;
 856 }
 857
 858 void
 859 exp_print_tree (tree)
 860      etree_type *tree;
 861 {
 862   if (config.map_file == NULL)
 863     config.map_file = stderr;
 864
 865   if (tree == NULL)
 866     {
 867       minfo ("NULL TREE\n");
 868       return;
 869     }
 870
 871   switch (tree->type.node_class)
 872     {
 873     case etree_value:
 874       minfo ("0x%v", tree->value.value);
 875       return;
 876     case etree_rel:
 877       if (tree->rel.section->owner != NULL)
 878         minfo ("%B:", tree->rel.section->owner);
 879       minfo ("%s+0x%v", tree->rel.section->name, tree->rel.value);
 880       return;
 881     case etree_assign:
 882 #if 0
 883       if (tree->assign.dst->sdefs != (asymbol *) NULL)
 884         fprintf (config.map_file, "%s (%x) ", tree->assign.dst->name,
 885                  tree->assign.dst->sdefs->value);
 886       else
 887         fprintf (config.map_file, "%s (UNDEFINED)", tree->assign.dst->name);
 888 #endif
 889       fprintf (config.map_file, "%s", tree->assign.dst);
 890       exp_print_token (tree->type.node_code);
 891       exp_print_tree (tree->assign.src);
 892       break;
 893     case etree_provide:
 894     case etree_provided:
 895       fprintf (config.map_file, "PROVIDE (%s, ", tree->assign.dst);
 896       exp_print_tree (tree->assign.src);
 897       fprintf (config.map_file, ")");
 898       break;
 899     case etree_binary:
 900       fprintf (config.map_file, "(");
 901       exp_print_tree (tree->binary.lhs);
 902       exp_print_token (tree->type.node_code);
 903       exp_print_tree (tree->binary.rhs);
 904       fprintf (config.map_file, ")");
 905       break;
 906     case etree_trinary:
 907       exp_print_tree (tree->trinary.cond);
 908       fprintf (config.map_file, "?");
 909       exp_print_tree (tree->trinary.lhs);
 910       fprintf (config.map_file, ":");
 911       exp_print_tree (tree->trinary.rhs);
 912       break;
 913     case etree_unary:
 914       exp_print_token (tree->unary.type.node_code);
 915       if (tree->unary.child)
 916         {
 917           fprintf (config.map_file, "(");
 918           exp_print_tree (tree->unary.child);
 919           fprintf (config.map_file, ")");
 920         }
 921       break;
 922
 923     case etree_assert:
 924       fprintf (config.map_file, "ASSERT (");
 925       exp_print_tree (tree->assert_s.child);
 926       fprintf (config.map_file, ", %s)", tree->assert_s.message);
 927       break;
 928
 929     case etree_undef:
 930       fprintf (config.map_file, "????????");
 931       break;
 932     case etree_name:
 933       if (tree->type.node_code == NAME)
 934         {
 935           fprintf (config.map_file, "%s", tree->name.name);
 936         }
 937       else
 938         {
 939           exp_print_token (tree->type.node_code);
 940           if (tree->name.name)
 941             fprintf (config.map_file, "(%s)", tree->name.name);
 942         }
 943       break;
 944     default:
 945       FAIL ();
 946       break;
 947     }
 948 }
 949
 950 bfd_vma
 951 exp_get_vma (tree, def, name, allocation_done)
 952      etree_type *tree;
 953      bfd_vma def;
 954      char *name;
 955      lang_phase_type allocation_done;
 956 {
 957   etree_value_type r;
 958
 959   if (tree != NULL)
 960     {
 961       r = exp_fold_tree_no_dot (tree, abs_output_section, allocation_done);
 962       if (! r.valid_p && name != NULL)
 963         einfo (_("%F%S nonconstant expression for %s\n"), name);
 964       return r.value;
 965     }
 966   else
 967     return def;
 968 }
 969
 970 int
 971 exp_get_value_int (tree, def, name, allocation_done)
 972      etree_type *tree;
 973      int def;
 974      char *name;
 975      lang_phase_type allocation_done;
 976 {
 977   return (int) exp_get_vma (tree, (bfd_vma) def, name, allocation_done);
 978 }
 979
 980 bfd_vma
 981 exp_get_abs_int (tree, def, name, allocation_done)
 982      etree_type *tree;
 983      int def ATTRIBUTE_UNUSED;
 984      char *name;
 985      lang_phase_type allocation_done;
 986 {
 987   etree_value_type res;
 988   res = exp_fold_tree_no_dot (tree, abs_output_section, allocation_done);
 989
 990   if (res.valid_p)
 991     res.value += res.section->bfd_section->vma;
 992   else
 993     einfo (_("%F%S non constant expression for %s\n"), name);
 994
 995   return res.value;
 996 }