ld/ldgram.y

   1 /* A YACC grammar to parse a superset of the AT&T linker scripting language.
   2    Copyright 1991-2013 Free Software Foundation, Inc.
   3    Written by Steve Chamberlain of Cygnus Support (steve@cygnus.com).
   4
   5    This file is part of the GNU Binutils.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 %{
  23 /*
  24
  25  */
  26
  27 #define DONTDECLARE_MALLOC
  28
  29 #include "sysdep.h"
  30 #include "bfd.h"
  31 #include "bfdlink.h"
  32 #include "ld.h"
  33 #include "ldexp.h"
  34 #include "ldver.h"
  35 #include "ldlang.h"
  36 #include "ldfile.h"
  37 #include "ldemul.h"
  38 #include "ldmisc.h"
  39 #include "ldmain.h"
  40 #include "mri.h"
  41 #include "ldctor.h"
  42 #include "ldlex.h"
  43
  44 #ifndef YYDEBUG
  45 #define YYDEBUG 1
  46 #endif
  47
  48 static enum section_type sectype;
  49 static lang_memory_region_type *region;
  50
  51 bfd_boolean ldgram_had_keep = FALSE;
  52 char *ldgram_vers_current_lang = NULL;
  53
  54 #define ERROR_NAME_MAX 20
  55 static char *error_names[ERROR_NAME_MAX];
  56 static int error_index;
  57 #define PUSH_ERROR(x) if (error_index < ERROR_NAME_MAX) error_names[error_index] = x; error_index++;
  58 #define POP_ERROR()   error_index--;
  59 %}
  60 %union {
  61   bfd_vma integer;
  62   struct big_int
  63     {
  64       bfd_vma integer;
  65       char *str;
  66     } bigint;
  67   fill_type *fill;
  68   char *name;
  69   const char *cname;
  70   struct wildcard_spec wildcard;
  71   struct wildcard_list *wildcard_list;
  72   struct name_list *name_list;
  73   struct flag_info_list *flag_info_list;
  74   struct flag_info *flag_info;
  75   int token;
  76   union etree_union *etree;
  77   struct phdr_info
  78     {
  79       bfd_boolean filehdr;
  80       bfd_boolean phdrs;
  81       union etree_union *at;
  82       union etree_union *flags;
  83     } phdr;
  84   struct lang_nocrossref *nocrossref;
  85   struct lang_output_section_phdr_list *section_phdr;
  86   struct bfd_elf_version_deps *deflist;
  87   struct bfd_elf_version_expr *versyms;
  88   struct bfd_elf_version_tree *versnode;
  89 }
  90
  91 %type <etree> exp opt_exp_with_type mustbe_exp opt_at phdr_type phdr_val
  92 %type <etree> opt_exp_without_type opt_subalign opt_align
  93 %type <fill> fill_opt fill_exp
  94 %type <name_list> exclude_name_list
  95 %type <wildcard_list> file_NAME_list
  96 %type <flag_info_list> sect_flag_list
  97 %type <flag_info> sect_flags
  98 %type <name> memspec_opt casesymlist
  99 %type <name> memspec_at_opt
 100 %type <cname> wildcard_name
 101 %type <wildcard> wildcard_spec
 102 %token <bigint> INT
 103 %token <name> NAME LNAME
 104 %type <integer> length
 105 %type <phdr> phdr_qualifiers
 106 %type <nocrossref> nocrossref_list
 107 %type <section_phdr> phdr_opt
 108 %type <integer> opt_nocrossrefs
 109
 110 %right <token> PLUSEQ MINUSEQ MULTEQ DIVEQ  '=' LSHIFTEQ RSHIFTEQ   ANDEQ OREQ
 111 %right <token> '?' ':'
 112 %left <token> OROR
 113 %left <token>  ANDAND
 114 %left <token> '|'
 115 %left <token>  '^'
 116 %left  <token> '&'
 117 %left <token>  EQ NE
 118 %left  <token> '<' '>' LE GE
 119 %left  <token> LSHIFT RSHIFT
 120
 121 %left  <token> '+' '-'
 122 %left  <token> '*' '/' '%'
 123
 124 %right UNARY
 125 %token END
 126 %left <token> '('
 127 %token <token> ALIGN_K BLOCK BIND QUAD SQUAD LONG SHORT BYTE
 128 %token SECTIONS PHDRS INSERT_K AFTER BEFORE
 129 %token DATA_SEGMENT_ALIGN DATA_SEGMENT_RELRO_END DATA_SEGMENT_END
 130 %token SORT_BY_NAME SORT_BY_ALIGNMENT SORT_NONE
 131 %token SORT_BY_INIT_PRIORITY
 132 %token '{' '}'
 133 %token SIZEOF_HEADERS OUTPUT_FORMAT FORCE_COMMON_ALLOCATION OUTPUT_ARCH
 134 %token INHIBIT_COMMON_ALLOCATION
 135 %token SEGMENT_START
 136 %token INCLUDE
 137 %token MEMORY
 138 %token REGION_ALIAS
 139 %token LD_FEATURE
 140 %token NOLOAD DSECT COPY INFO OVERLAY
 141 %token DEFINED TARGET_K SEARCH_DIR MAP ENTRY
 142 %token <integer> NEXT
 143 %token SIZEOF ALIGNOF ADDR LOADADDR MAX_K MIN_K
 144 %token STARTUP HLL SYSLIB FLOAT NOFLOAT NOCROSSREFS
 145 %token ORIGIN FILL
 146 %token LENGTH CREATE_OBJECT_SYMBOLS INPUT GROUP OUTPUT CONSTRUCTORS
 147 %token ALIGNMOD AT SUBALIGN HIDDEN PROVIDE PROVIDE_HIDDEN AS_NEEDED
 148 %type <token> assign_op atype attributes_opt sect_constraint opt_align_with_input
 149 %type <name>  filename
 150 %token CHIP LIST SECT ABSOLUTE  LOAD NEWLINE ENDWORD ORDER NAMEWORD ASSERT_K
 151 %token FORMAT PUBLIC DEFSYMEND BASE ALIAS TRUNCATE REL
 152 %token INPUT_SCRIPT INPUT_MRI_SCRIPT INPUT_DEFSYM CASE EXTERN START
 153 %token <name> VERS_TAG VERS_IDENTIFIER
 154 %token GLOBAL LOCAL VERSIONK INPUT_VERSION_SCRIPT
 155 %token KEEP ONLY_IF_RO ONLY_IF_RW SPECIAL INPUT_SECTION_FLAGS ALIGN_WITH_INPUT
 156 %token EXCLUDE_FILE
 157 %token CONSTANT
 158 %type <versyms> vers_defns
 159 %type <versnode> vers_tag
 160 %type <deflist> verdep
 161 %token INPUT_DYNAMIC_LIST
 162
 163 %%
 164
 165 file:
 166                 INPUT_SCRIPT script_file
 167         |       INPUT_MRI_SCRIPT mri_script_file
 168         |       INPUT_VERSION_SCRIPT version_script_file
 169         |       INPUT_DYNAMIC_LIST dynamic_list_file
 170         |       INPUT_DEFSYM defsym_expr
 171         ;
 172
 173
 174 filename:  NAME;
 175
 176
 177 defsym_expr:
 178                 { ldlex_defsym(); }
 179                 NAME '=' exp
 180                 {
 181                   ldlex_popstate();
 182                   lang_add_assignment (exp_defsym ($2, $4));
 183                 }
 184         ;
 185
 186 /* SYNTAX WITHIN AN MRI SCRIPT FILE */
 187 mri_script_file:
 188                 {
 189                   ldlex_mri_script ();
 190                   PUSH_ERROR (_("MRI style script"));
 191                 }
 192              mri_script_lines
 193                 {
 194                   ldlex_popstate ();
 195                   mri_draw_tree ();
 196                   POP_ERROR ();
 197                 }
 198         ;
 199
 200 mri_script_lines:
 201                 mri_script_lines mri_script_command NEWLINE
 202           |
 203         ;
 204
 205 mri_script_command:
 206                 CHIP  exp
 207         |       CHIP  exp ',' exp
 208         |       NAME    {
 209                         einfo(_("%P%F: unrecognised keyword in MRI style script '%s'\n"),$1);
 210                         }
 211         |       LIST    {
 212                         config.map_filename = "-";
 213                         }
 214         |       ORDER ordernamelist
 215         |       ENDWORD
 216         |       PUBLIC NAME '=' exp
 217                         { mri_public($2, $4); }
 218         |       PUBLIC NAME ',' exp
 219                         { mri_public($2, $4); }
 220         |       PUBLIC NAME  exp
 221                         { mri_public($2, $3); }
 222         |       FORMAT NAME
 223                         { mri_format($2); }
 224         |       SECT NAME ',' exp
 225                         { mri_output_section($2, $4);}
 226         |       SECT NAME  exp
 227                         { mri_output_section($2, $3);}
 228         |       SECT NAME '=' exp
 229                         { mri_output_section($2, $4);}
 230         |       ALIGN_K NAME '=' exp
 231                         { mri_align($2,$4); }
 232         |       ALIGN_K NAME ',' exp
 233                         { mri_align($2,$4); }
 234         |       ALIGNMOD NAME '=' exp
 235                         { mri_alignmod($2,$4); }
 236         |       ALIGNMOD NAME ',' exp
 237                         { mri_alignmod($2,$4); }
 238         |       ABSOLUTE mri_abs_name_list
 239         |       LOAD     mri_load_name_list
 240         |       NAMEWORD NAME
 241                         { mri_name($2); }
 242         |       ALIAS NAME ',' NAME
 243                         { mri_alias($2,$4,0);}
 244         |       ALIAS NAME ',' INT
 245                         { mri_alias ($2, 0, (int) $4.integer); }
 246         |       BASE     exp
 247                         { mri_base($2); }
 248         |       TRUNCATE INT
 249                 { mri_truncate ((unsigned int) $2.integer); }
 250         |       CASE casesymlist
 251         |       EXTERN extern_name_list
 252         |       INCLUDE filename
 253                 { ldlex_script (); ldfile_open_command_file($2); }
 254                 mri_script_lines END
 255                 { ldlex_popstate (); }
 256         |       START NAME
 257                 { lang_add_entry ($2, FALSE); }
 258         |
 259         ;
 260
 261 ordernamelist:
 262               ordernamelist ',' NAME         { mri_order($3); }
 263         |     ordernamelist  NAME         { mri_order($2); }
 264         |
 265         ;
 266
 267 mri_load_name_list:
 268                 NAME
 269                         { mri_load($1); }
 270         |       mri_load_name_list ',' NAME { mri_load($3); }
 271         ;
 272
 273 mri_abs_name_list:
 274                 NAME
 275                         { mri_only_load($1); }
 276         |       mri_abs_name_list ','  NAME
 277                         { mri_only_load($3); }
 278         ;
 279
 280 casesymlist:
 281           /* empty */ { $$ = NULL; }
 282         | NAME
 283         | casesymlist ',' NAME
 284         ;
 285
 286 /* Parsed as expressions so that commas separate entries */
 287 extern_name_list:
 288         { ldlex_expression (); }
 289         extern_name_list_body
 290         { ldlex_popstate (); }
 291
 292 extern_name_list_body:
 293           NAME
 294                         { ldlang_add_undef ($1, FALSE); }
 295         | extern_name_list_body NAME
 296                         { ldlang_add_undef ($2, FALSE); }
 297         | extern_name_list_body ',' NAME
 298                         { ldlang_add_undef ($3, FALSE); }
 299         ;
 300
 301 script_file:
 302         { ldlex_both(); }
 303         ifile_list
 304         { ldlex_popstate(); }
 305         ;
 306
 307 ifile_list:
 308         ifile_list ifile_p1
 309         |
 310         ;
 311
 312
 313 ifile_p1:
 314                 memory
 315         |       sections
 316         |       phdrs
 317         |       startup
 318         |       high_level_library
 319         |       low_level_library
 320         |       floating_point_support
 321         |       statement_anywhere
 322         |       version
 323         |        ';'
 324         |       TARGET_K '(' NAME ')'
 325                 { lang_add_target($3); }
 326         |       SEARCH_DIR '(' filename ')'
 327                 { ldfile_add_library_path ($3, FALSE); }
 328         |       OUTPUT '(' filename ')'
 329                 { lang_add_output($3, 1); }
 330         |       OUTPUT_FORMAT '(' NAME ')'
 331                   { lang_add_output_format ($3, (char *) NULL,
 332                                             (char *) NULL, 1); }
 333         |       OUTPUT_FORMAT '(' NAME ',' NAME ',' NAME ')'
 334                   { lang_add_output_format ($3, $5, $7, 1); }
 335         |       OUTPUT_ARCH '(' NAME ')'
 336                   { ldfile_set_output_arch ($3, bfd_arch_unknown); }
 337         |       FORCE_COMMON_ALLOCATION
 338                 { command_line.force_common_definition = TRUE ; }
 339         |       INHIBIT_COMMON_ALLOCATION
 340                 { command_line.inhibit_common_definition = TRUE ; }
 341         |       INPUT '(' input_list ')'
 342         |       GROUP
 343                   { lang_enter_group (); }
 344                     '(' input_list ')'
 345                   { lang_leave_group (); }
 346         |       MAP '(' filename ')'
 347                 { lang_add_map($3); }
 348         |       INCLUDE filename
 349                 { ldlex_script (); ldfile_open_command_file($2); }
 350                 ifile_list END
 351                 { ldlex_popstate (); }
 352         |       NOCROSSREFS '(' nocrossref_list ')'
 353                 {
 354                   lang_add_nocrossref ($3);
 355                 }
 356         |       EXTERN '(' extern_name_list ')'
 357         |       INSERT_K AFTER NAME
 358                 { lang_add_insert ($3, 0); }
 359         |       INSERT_K BEFORE NAME
 360                 { lang_add_insert ($3, 1); }
 361         |       REGION_ALIAS '(' NAME ',' NAME ')'
 362                 { lang_memory_region_alias ($3, $5); }
 363         |       LD_FEATURE '(' NAME ')'
 364                 { lang_ld_feature ($3); }
 365         ;
 366
 367 input_list:
 368                 NAME
 369                 { lang_add_input_file($1,lang_input_file_is_search_file_enum,
 370                                  (char *)NULL); }
 371         |       input_list ',' NAME
 372                 { lang_add_input_file($3,lang_input_file_is_search_file_enum,
 373                                  (char *)NULL); }
 374         |       input_list NAME
 375                 { lang_add_input_file($2,lang_input_file_is_search_file_enum,
 376                                  (char *)NULL); }
 377         |       LNAME
 378                 { lang_add_input_file($1,lang_input_file_is_l_enum,
 379                                  (char *)NULL); }
 380         |       input_list ',' LNAME
 381                 { lang_add_input_file($3,lang_input_file_is_l_enum,
 382                                  (char *)NULL); }
 383         |       input_list LNAME
 384                 { lang_add_input_file($2,lang_input_file_is_l_enum,
 385                                  (char *)NULL); }
 386         |       AS_NEEDED '('
 387                   { $<integer>$ = input_flags.add_DT_NEEDED_for_regular;
 388                     input_flags.add_DT_NEEDED_for_regular = TRUE; }
 389                      input_list ')'
 390                   { input_flags.add_DT_NEEDED_for_regular = $<integer>3; }
 391         |       input_list ',' AS_NEEDED '('
 392                   { $<integer>$ = input_flags.add_DT_NEEDED_for_regular;
 393                     input_flags.add_DT_NEEDED_for_regular = TRUE; }
 394                      input_list ')'
 395                   { input_flags.add_DT_NEEDED_for_regular = $<integer>5; }
 396         |       input_list AS_NEEDED '('
 397                   { $<integer>$ = input_flags.add_DT_NEEDED_for_regular;
 398                     input_flags.add_DT_NEEDED_for_regular = TRUE; }
 399                      input_list ')'
 400                   { input_flags.add_DT_NEEDED_for_regular = $<integer>4; }
 401         ;
 402
 403 sections:
 404                 SECTIONS '{' sec_or_group_p1 '}'
 405         ;
 406
 407 sec_or_group_p1:
 408                 sec_or_group_p1 section
 409         |       sec_or_group_p1 statement_anywhere
 410         |
 411         ;
 412
 413 statement_anywhere:
 414                 ENTRY '(' NAME ')'
 415                 { lang_add_entry ($3, FALSE); }
 416         |       assignment end
 417         |       ASSERT_K  {ldlex_expression ();} '(' exp ',' NAME ')'
 418                 { ldlex_popstate ();
 419                   lang_add_assignment (exp_assert ($4, $6)); }
 420         ;
 421
 422 /* The '*' and '?' cases are there because the lexer returns them as
 423    separate tokens rather than as NAME.  */
 424 wildcard_name:
 425                 NAME
 426                         {
 427                           $$ = $1;
 428                         }
 429         |       '*'
 430                         {
 431                           $$ = "*";
 432                         }
 433         |       '?'
 434                         {
 435                           $$ = "?";
 436                         }
 437         ;
 438
 439 wildcard_spec:
 440                 wildcard_name
 441                         {
 442                           $$.name = $1;
 443                           $$.sorted = none;
 444                           $$.exclude_name_list = NULL;
 445                           $$.section_flag_list = NULL;
 446                         }
 447         |       EXCLUDE_FILE '(' exclude_name_list ')' wildcard_name
 448                         {
 449                           $$.name = $5;
 450                           $$.sorted = none;
 451                           $$.exclude_name_list = $3;
 452                           $$.section_flag_list = NULL;
 453                         }
 454         |       SORT_BY_NAME '(' wildcard_name ')'
 455                         {
 456                           $$.name = $3;
 457                           $$.sorted = by_name;
 458                           $$.exclude_name_list = NULL;
 459                           $$.section_flag_list = NULL;
 460                         }
 461         |       SORT_BY_ALIGNMENT '(' wildcard_name ')'
 462                         {
 463                           $$.name = $3;
 464                           $$.sorted = by_alignment;
 465                           $$.exclude_name_list = NULL;
 466                           $$.section_flag_list = NULL;
 467                         }
 468         |       SORT_NONE '(' wildcard_name ')'
 469                         {
 470                           $$.name = $3;
 471                           $$.sorted = by_none;
 472                           $$.exclude_name_list = NULL;
 473                           $$.section_flag_list = NULL;
 474                         }
 475         |       SORT_BY_NAME '(' SORT_BY_ALIGNMENT '(' wildcard_name ')' ')'
 476                         {
 477                           $$.name = $5;
 478                           $$.sorted = by_name_alignment;
 479                           $$.exclude_name_list = NULL;
 480                           $$.section_flag_list = NULL;
 481                         }
 482         |       SORT_BY_NAME '(' SORT_BY_NAME '(' wildcard_name ')' ')'
 483                         {
 484                           $$.name = $5;
 485                           $$.sorted = by_name;
 486                           $$.exclude_name_list = NULL;
 487                           $$.section_flag_list = NULL;
 488                         }
 489         |       SORT_BY_ALIGNMENT '(' SORT_BY_NAME '(' wildcard_name ')' ')'
 490                         {
 491                           $$.name = $5;
 492                           $$.sorted = by_alignment_name;
 493                           $$.exclude_name_list = NULL;
 494                           $$.section_flag_list = NULL;
 495                         }
 496         |       SORT_BY_ALIGNMENT '(' SORT_BY_ALIGNMENT '(' wildcard_name ')' ')'
 497                         {
 498                           $$.name = $5;
 499                           $$.sorted = by_alignment;
 500                           $$.exclude_name_list = NULL;
 501                           $$.section_flag_list = NULL;
 502                         }
 503         |       SORT_BY_NAME '(' EXCLUDE_FILE '(' exclude_name_list ')' wildcard_name ')'
 504                         {
 505                           $$.name = $7;
 506                           $$.sorted = by_name;
 507                           $$.exclude_name_list = $5;
 508                           $$.section_flag_list = NULL;
 509                         }
 510         |       SORT_BY_INIT_PRIORITY '(' wildcard_name ')'
 511                         {
 512                           $$.name = $3;
 513                           $$.sorted = by_init_priority;
 514                           $$.exclude_name_list = NULL;
 515                           $$.section_flag_list = NULL;
 516                         }
 517         ;
 518
 519 sect_flag_list: NAME
 520                         {
 521                           struct flag_info_list *n;
 522                           n = ((struct flag_info_list *) xmalloc (sizeof *n));
 523                           if ($1[0] == '!')
 524                             {
 525                               n->with = without_flags;
 526                               n->name = &$1[1];
 527                             }
 528                           else
 529                             {
 530                               n->with = with_flags;
 531                               n->name = $1;
 532                             }
 533                           n->valid = FALSE;
 534                           n->next = NULL;
 535                           $$ = n;
 536                         }
 537         |       sect_flag_list '&' NAME
 538                         {
 539                           struct flag_info_list *n;
 540                           n = ((struct flag_info_list *) xmalloc (sizeof *n));
 541                           if ($3[0] == '!')
 542                             {
 543                               n->with = without_flags;
 544                               n->name = &$3[1];
 545                             }
 546                           else
 547                             {
 548                               n->with = with_flags;
 549                               n->name = $3;
 550                             }
 551                           n->valid = FALSE;
 552                           n->next = $1;
 553                           $$ = n;
 554                         }
 555         ;
 556
 557 sect_flags:
 558                 INPUT_SECTION_FLAGS '(' sect_flag_list ')'
 559                         {
 560                           struct flag_info *n;
 561                           n = ((struct flag_info *) xmalloc (sizeof *n));
 562                           n->flag_list = $3;
 563                           n->flags_initialized = FALSE;
 564                           n->not_with_flags = 0;
 565                           n->only_with_flags = 0;
 566                           $$ = n;
 567                         }
 568         ;
 569
 570 exclude_name_list:
 571                 exclude_name_list wildcard_name
 572                         {
 573                           struct name_list *tmp;
 574                           tmp = (struct name_list *) xmalloc (sizeof *tmp);
 575                           tmp->name = $2;
 576                           tmp->next = $1;
 577                           $$ = tmp;
 578                         }
 579         |
 580                 wildcard_name
 581                         {
 582                           struct name_list *tmp;
 583                           tmp = (struct name_list *) xmalloc (sizeof *tmp);
 584                           tmp->name = $1;
 585                           tmp->next = NULL;
 586                           $$ = tmp;
 587                         }
 588         ;
 589
 590 file_NAME_list:
 591                 file_NAME_list opt_comma wildcard_spec
 592                         {
 593                           struct wildcard_list *tmp;
 594                           tmp = (struct wildcard_list *) xmalloc (sizeof *tmp);
 595                           tmp->next = $1;
 596                           tmp->spec = $3;
 597                           $$ = tmp;
 598                         }
 599         |
 600                 wildcard_spec
 601                         {
 602                           struct wildcard_list *tmp;
 603                           tmp = (struct wildcard_list *) xmalloc (sizeof *tmp);
 604                           tmp->next = NULL;
 605                           tmp->spec = $1;
 606                           $$ = tmp;
 607                         }
 608         ;
 609
 610 input_section_spec_no_keep:
 611                 NAME
 612                         {
 613                           struct wildcard_spec tmp;
 614                           tmp.name = $1;
 615                           tmp.exclude_name_list = NULL;
 616                           tmp.sorted = none;
 617                           tmp.section_flag_list = NULL;
 618                           lang_add_wild (&tmp, NULL, ldgram_had_keep);
 619                         }
 620         |       sect_flags NAME
 621                         {
 622                           struct wildcard_spec tmp;
 623                           tmp.name = $2;
 624                           tmp.exclude_name_list = NULL;
 625                           tmp.sorted = none;
 626                           tmp.section_flag_list = $1;
 627                           lang_add_wild (&tmp, NULL, ldgram_had_keep);
 628                         }
 629         |       '[' file_NAME_list ']'
 630                         {
 631                           lang_add_wild (NULL, $2, ldgram_had_keep);
 632                         }
 633         |       sect_flags '[' file_NAME_list ']'
 634                         {
 635                           struct wildcard_spec tmp;
 636                           tmp.name = NULL;
 637                           tmp.exclude_name_list = NULL;
 638                           tmp.sorted = none;
 639                           tmp.section_flag_list = $1;
 640                           lang_add_wild (&tmp, $3, ldgram_had_keep);
 641                         }
 642         |       wildcard_spec '(' file_NAME_list ')'
 643                         {
 644                           lang_add_wild (&$1, $3, ldgram_had_keep);
 645                         }
 646         |       sect_flags wildcard_spec '(' file_NAME_list ')'
 647                         {
 648                           $2.section_flag_list = $1;
 649                           lang_add_wild (&$2, $4, ldgram_had_keep);
 650                         }
 651         ;
 652
 653 input_section_spec:
 654                 input_section_spec_no_keep
 655         |       KEEP '('
 656                         { ldgram_had_keep = TRUE; }
 657                 input_section_spec_no_keep ')'
 658                         { ldgram_had_keep = FALSE; }
 659         ;
 660
 661 statement:
 662                 assignment end
 663         |       CREATE_OBJECT_SYMBOLS
 664                 {
 665                 lang_add_attribute(lang_object_symbols_statement_enum);
 666                 }
 667         |       ';'
 668         |       CONSTRUCTORS
 669                 {
 670
 671                   lang_add_attribute(lang_constructors_statement_enum);
 672                 }
 673         | SORT_BY_NAME '(' CONSTRUCTORS ')'
 674                 {
 675                   constructors_sorted = TRUE;
 676                   lang_add_attribute (lang_constructors_statement_enum);
 677                 }
 678         | input_section_spec
 679         | length '(' mustbe_exp ')'
 680                         {
 681                           lang_add_data ((int) $1, $3);
 682                         }
 683
 684         | FILL '(' fill_exp ')'
 685                         {
 686                           lang_add_fill ($3);
 687                         }
 688         | ASSERT_K  {ldlex_expression ();} '(' exp ',' NAME ')' end
 689                         { ldlex_popstate ();
 690                           lang_add_assignment (exp_assert ($4, $6)); }
 691         | INCLUDE filename
 692                 { ldlex_script (); ldfile_open_command_file($2); }
 693                 statement_list_opt END
 694                 { ldlex_popstate (); }
 695         ;
 696
 697 statement_list:
 698                 statement_list statement
 699         |       statement
 700         ;
 701
 702 statement_list_opt:
 703                 /* empty */
 704         |       statement_list
 705         ;
 706
 707 length:
 708                 QUAD
 709                         { $$ = $1; }
 710         |       SQUAD
 711                         { $$ = $1; }
 712         |       LONG
 713                         { $$ = $1; }
 714         |       SHORT
 715                         { $$ = $1; }
 716         |       BYTE
 717                         { $$ = $1; }
 718         ;
 719
 720 fill_exp:
 721         mustbe_exp
 722                 {
 723                   $$ = exp_get_fill ($1, 0, "fill value");
 724                 }
 725         ;
 726
 727 fill_opt:
 728           '=' fill_exp
 729                 { $$ = $2; }
 730         |       { $$ = (fill_type *) 0; }
 731         ;
 732
 733 assign_op:
 734                 PLUSEQ
 735                         { $$ = '+'; }
 736         |       MINUSEQ
 737                         { $$ = '-'; }
 738         |       MULTEQ
 739                         { $$ = '*'; }
 740         |       DIVEQ
 741                         { $$ = '/'; }
 742         |       LSHIFTEQ
 743                         { $$ = LSHIFT; }
 744         |       RSHIFTEQ
 745                         { $$ = RSHIFT; }
 746         |       ANDEQ
 747                         { $$ = '&'; }
 748         |       OREQ
 749                         { $$ = '|'; }
 750
 751         ;
 752
 753 end:    ';' | ','
 754         ;
 755
 756
 757 assignment:
 758                 NAME '=' mustbe_exp
 759                 {
 760                   lang_add_assignment (exp_assign ($1, $3, FALSE));
 761                 }
 762         |       NAME assign_op mustbe_exp
 763                 {
 764                   lang_add_assignment (exp_assign ($1,
 765                                                    exp_binop ($2,
 766                                                               exp_nameop (NAME,
 767                                                                           $1),
 768                                                               $3), FALSE));
 769                 }
 770         |       HIDDEN '(' NAME '=' mustbe_exp ')'
 771                 {
 772                   lang_add_assignment (exp_assign ($3, $5, TRUE));
 773                 }
 774         |       PROVIDE '(' NAME '=' mustbe_exp ')'
 775                 {
 776                   lang_add_assignment (exp_provide ($3, $5, FALSE));
 777                 }
 778         |       PROVIDE_HIDDEN '(' NAME '=' mustbe_exp ')'
 779                 {
 780                   lang_add_assignment (exp_provide ($3, $5, TRUE));
 781                 }
 782         ;
 783
 784
 785 opt_comma:
 786                 ','     |       ;
 787
 788
 789 memory:
 790                 MEMORY '{' memory_spec_list_opt '}'
 791         ;
 792
 793 memory_spec_list_opt: memory_spec_list | ;
 794
 795 memory_spec_list:
 796                 memory_spec_list opt_comma memory_spec
 797         |       memory_spec
 798         ;
 799
 800
 801 memory_spec:    NAME
 802                 { region = lang_memory_region_lookup ($1, TRUE); }
 803                 attributes_opt ':'
 804                 origin_spec opt_comma length_spec
 805                 {}
 806         |       INCLUDE filename
 807                 { ldlex_script (); ldfile_open_command_file($2); }
 808                 memory_spec_list_opt END
 809                 { ldlex_popstate (); }
 810         ;
 811
 812 origin_spec:
 813         ORIGIN '=' mustbe_exp
 814                 {
 815                   region->origin = exp_get_vma ($3, 0, "origin");
 816                   region->current = region->origin;
 817                 }
 818         ;
 819
 820 length_spec:
 821              LENGTH '=' mustbe_exp
 822                 {
 823                   region->length = exp_get_vma ($3, -1, "length");
 824                 }
 825         ;
 826
 827 attributes_opt:
 828                 /* empty */
 829                   { /* dummy action to avoid bison 1.25 error message */ }
 830         |       '(' attributes_list ')'
 831         ;
 832
 833 attributes_list:
 834                 attributes_string
 835         |       attributes_list attributes_string
 836         ;
 837
 838 attributes_string:
 839                 NAME
 840                   { lang_set_flags (region, $1, 0); }
 841         |       '!' NAME
 842                   { lang_set_flags (region, $2, 1); }
 843         ;
 844
 845 startup:
 846         STARTUP '(' filename ')'
 847                 { lang_startup($3); }
 848         ;
 849
 850 high_level_library:
 851                 HLL '(' high_level_library_NAME_list ')'
 852         |       HLL '(' ')'
 853                         { ldemul_hll((char *)NULL); }
 854         ;
 855
 856 high_level_library_NAME_list:
 857                 high_level_library_NAME_list opt_comma filename
 858                         { ldemul_hll($3); }
 859         |       filename
 860                         { ldemul_hll($1); }
 861
 862         ;
 863
 864 low_level_library:
 865         SYSLIB '(' low_level_library_NAME_list ')'
 866         ; low_level_library_NAME_list:
 867                 low_level_library_NAME_list opt_comma filename
 868                         { ldemul_syslib($3); }
 869         |
 870         ;
 871
 872 floating_point_support:
 873                 FLOAT
 874                         { lang_float(TRUE); }
 875         |       NOFLOAT
 876                         { lang_float(FALSE); }
 877         ;
 878
 879 nocrossref_list:
 880                 /* empty */
 881                 {
 882                   $$ = NULL;
 883                 }
 884         |       NAME nocrossref_list
 885                 {
 886                   struct lang_nocrossref *n;
 887
 888                   n = (struct lang_nocrossref *) xmalloc (sizeof *n);
 889                   n->name = $1;
 890                   n->next = $2;
 891                   $$ = n;
 892                 }
 893         |       NAME ',' nocrossref_list
 894                 {
 895                   struct lang_nocrossref *n;
 896
 897                   n = (struct lang_nocrossref *) xmalloc (sizeof *n);
 898                   n->name = $1;
 899                   n->next = $3;
 900                   $$ = n;
 901                 }
 902         ;
 903
 904 mustbe_exp:              { ldlex_expression (); }
 905                 exp
 906                          { ldlex_popstate (); $$=$2;}
 907         ;
 908
 909 exp     :
 910                 '-' exp %prec UNARY
 911                         { $$ = exp_unop ('-', $2); }
 912         |       '(' exp ')'
 913                         { $$ = $2; }
 914         |       NEXT '(' exp ')' %prec UNARY
 915                         { $$ = exp_unop ((int) $1,$3); }
 916         |       '!' exp %prec UNARY
 917                         { $$ = exp_unop ('!', $2); }
 918         |       '+' exp %prec UNARY
 919                         { $$ = $2; }
 920         |       '~' exp %prec UNARY
 921                         { $$ = exp_unop ('~', $2);}
 922
 923         |       exp '*' exp
 924                         { $$ = exp_binop ('*', $1, $3); }
 925         |       exp '/' exp
 926                         { $$ = exp_binop ('/', $1, $3); }
 927         |       exp '%' exp
 928                         { $$ = exp_binop ('%', $1, $3); }
 929         |       exp '+' exp
 930                         { $$ = exp_binop ('+', $1, $3); }
 931         |       exp '-' exp
 932                         { $$ = exp_binop ('-' , $1, $3); }
 933         |       exp LSHIFT exp
 934                         { $$ = exp_binop (LSHIFT , $1, $3); }
 935         |       exp RSHIFT exp
 936                         { $$ = exp_binop (RSHIFT , $1, $3); }
 937         |       exp EQ exp
 938                         { $$ = exp_binop (EQ , $1, $3); }
 939         |       exp NE exp
 940                         { $$ = exp_binop (NE , $1, $3); }
 941         |       exp LE exp
 942                         { $$ = exp_binop (LE , $1, $3); }
 943         |       exp GE exp
 944                         { $$ = exp_binop (GE , $1, $3); }
 945         |       exp '<' exp
 946                         { $$ = exp_binop ('<' , $1, $3); }
 947         |       exp '>' exp
 948                         { $$ = exp_binop ('>' , $1, $3); }
 949         |       exp '&' exp
 950                         { $$ = exp_binop ('&' , $1, $3); }
 951         |       exp '^' exp
 952                         { $$ = exp_binop ('^' , $1, $3); }
 953         |       exp '|' exp
 954                         { $$ = exp_binop ('|' , $1, $3); }
 955         |       exp '?' exp ':' exp
 956                         { $$ = exp_trinop ('?' , $1, $3, $5); }
 957         |       exp ANDAND exp
 958                         { $$ = exp_binop (ANDAND , $1, $3); }
 959         |       exp OROR exp
 960                         { $$ = exp_binop (OROR , $1, $3); }
 961         |       DEFINED '(' NAME ')'
 962                         { $$ = exp_nameop (DEFINED, $3); }
 963         |       INT
 964                         { $$ = exp_bigintop ($1.integer, $1.str); }
 965         |       SIZEOF_HEADERS
 966                         { $$ = exp_nameop (SIZEOF_HEADERS,0); }
 967
 968         |       ALIGNOF '(' NAME ')'
 969                         { $$ = exp_nameop (ALIGNOF,$3); }
 970         |       SIZEOF '(' NAME ')'
 971                         { $$ = exp_nameop (SIZEOF,$3); }
 972         |       ADDR '(' NAME ')'
 973                         { $$ = exp_nameop (ADDR,$3); }
 974         |       LOADADDR '(' NAME ')'
 975                         { $$ = exp_nameop (LOADADDR,$3); }
 976         |       CONSTANT '(' NAME ')'
 977                         { $$ = exp_nameop (CONSTANT,$3); }
 978         |       ABSOLUTE '(' exp ')'
 979                         { $$ = exp_unop (ABSOLUTE, $3); }
 980         |       ALIGN_K '(' exp ')'
 981                         { $$ = exp_unop (ALIGN_K,$3); }
 982         |       ALIGN_K '(' exp ',' exp ')'
 983                         { $$ = exp_binop (ALIGN_K,$3,$5); }
 984         |       DATA_SEGMENT_ALIGN '(' exp ',' exp ')'
 985                         { $$ = exp_binop (DATA_SEGMENT_ALIGN, $3, $5); }
 986         |       DATA_SEGMENT_RELRO_END '(' exp ',' exp ')'
 987                         { $$ = exp_binop (DATA_SEGMENT_RELRO_END, $5, $3); }
 988         |       DATA_SEGMENT_END '(' exp ')'
 989                         { $$ = exp_unop (DATA_SEGMENT_END, $3); }
 990         |       SEGMENT_START '(' NAME ',' exp ')'
 991                         { /* The operands to the expression node are
 992                              placed in the opposite order from the way
 993                              in which they appear in the script as
 994                              that allows us to reuse more code in
 995                              fold_binary.  */
 996                           $$ = exp_binop (SEGMENT_START,
 997                                           $5,
 998                                           exp_nameop (NAME, $3)); }
 999         |       BLOCK '(' exp ')'
1000                         { $$ = exp_unop (ALIGN_K,$3); }
1001         |       NAME
1002                         { $$ = exp_nameop (NAME,$1); }
1003         |       MAX_K '(' exp ',' exp ')'
1004                         { $$ = exp_binop (MAX_K, $3, $5 ); }
1005         |       MIN_K '(' exp ',' exp ')'
1006                         { $$ = exp_binop (MIN_K, $3, $5 ); }
1007         |       ASSERT_K '(' exp ',' NAME ')'
1008                         { $$ = exp_assert ($3, $5); }
1009         |       ORIGIN '(' NAME ')'
1010                         { $$ = exp_nameop (ORIGIN, $3); }
1011         |       LENGTH '(' NAME ')'
1012                         { $$ = exp_nameop (LENGTH, $3); }
1013         ;
1014
1015
1016 memspec_at_opt:
1017                 AT '>' NAME { $$ = $3; }
1018         |       { $$ = 0; }
1019         ;
1020
1021 opt_at:
1022                 AT '(' exp ')' { $$ = $3; }
1023         |       { $$ = 0; }
1024         ;
1025
1026 opt_align:
1027                 ALIGN_K '(' exp ')' { $$ = $3; }
1028         |       { $$ = 0; }
1029         ;
1030
1031 opt_align_with_input:
1032                 ALIGN_WITH_INPUT { $$ = ALIGN_WITH_INPUT; }
1033         |       { $$ = 0; }
1034         ;
1035
1036 opt_subalign:
1037                 SUBALIGN '(' exp ')' { $$ = $3; }
1038         |       { $$ = 0; }
1039         ;
1040
1041 sect_constraint:
1042                 ONLY_IF_RO { $$ = ONLY_IF_RO; }
1043         |       ONLY_IF_RW { $$ = ONLY_IF_RW; }
1044         |       SPECIAL { $$ = SPECIAL; }
1045         |       { $$ = 0; }
1046         ;
1047
1048 section:        NAME            { ldlex_expression(); }
1049                 opt_exp_with_type
1050                 opt_at
1051                 opt_align
1052                 opt_align_with_input
1053                 opt_subalign    { ldlex_popstate (); ldlex_script (); }
1054                 sect_constraint
1055                 '{'
1056                         {
1057                           lang_enter_output_section_statement($1, $3,
1058                                                               sectype,
1059                                                               $5, $7, $4, $9, $6);
1060                         }
1061                 statement_list_opt
1062                 '}' { ldlex_popstate (); ldlex_expression (); }
1063                 memspec_opt memspec_at_opt phdr_opt fill_opt
1064                 {
1065                   ldlex_popstate ();
1066                   lang_leave_output_section_statement ($18, $15, $17, $16);
1067                 }
1068                 opt_comma
1069                 {}
1070         |       OVERLAY
1071                         { ldlex_expression (); }
1072                 opt_exp_without_type opt_nocrossrefs opt_at opt_subalign
1073                         { ldlex_popstate (); ldlex_script (); }
1074                 '{'
1075                         {
1076                           lang_enter_overlay ($3, $6);
1077                         }
1078                 overlay_section
1079                 '}'
1080                         { ldlex_popstate (); ldlex_expression (); }
1081                 memspec_opt memspec_at_opt phdr_opt fill_opt
1082                         {
1083                           ldlex_popstate ();
1084                           lang_leave_overlay ($5, (int) $4,
1085                                               $16, $13, $15, $14);
1086                         }
1087                 opt_comma
1088         |       /* The GROUP case is just enough to support the gcc
1089                    svr3.ifile script.  It is not intended to be full
1090                    support.  I'm not even sure what GROUP is supposed
1091                    to mean.  */
1092                 GROUP { ldlex_expression (); }
1093                 opt_exp_with_type
1094                 {
1095                   ldlex_popstate ();
1096                   lang_add_assignment (exp_assign (".", $3, FALSE));
1097                 }
1098                 '{' sec_or_group_p1 '}'
1099         |       INCLUDE filename
1100                 { ldlex_script (); ldfile_open_command_file($2); }
1101                 sec_or_group_p1 END
1102                 { ldlex_popstate (); }
1103         ;
1104
1105 type:
1106            NOLOAD  { sectype = noload_section; }
1107         |  DSECT   { sectype = noalloc_section; }
1108         |  COPY    { sectype = noalloc_section; }
1109         |  INFO    { sectype = noalloc_section; }
1110         |  OVERLAY { sectype = noalloc_section; }
1111         ;
1112
1113 atype:
1114                 '(' type ')'
1115         |       /* EMPTY */ { sectype = normal_section; }
1116         |       '(' ')' { sectype = normal_section; }
1117         ;
1118
1119 opt_exp_with_type:
1120                 exp atype ':'           { $$ = $1; }
1121         |       atype ':'               { $$ = (etree_type *)NULL;  }
1122         |       /* The BIND cases are to support the gcc svr3.ifile
1123                    script.  They aren't intended to implement full
1124                    support for the BIND keyword.  I'm not even sure
1125                    what BIND is supposed to mean.  */
1126                 BIND '(' exp ')' atype ':' { $$ = $3; }
1127         |       BIND '(' exp ')' BLOCK '(' exp ')' atype ':'
1128                 { $$ = $3; }
1129         ;
1130
1131 opt_exp_without_type:
1132                 exp ':'         { $$ = $1; }
1133         |       ':'             { $$ = (etree_type *) NULL;  }
1134         ;
1135
1136 opt_nocrossrefs:
1137                 /* empty */
1138                         { $$ = 0; }
1139         |       NOCROSSREFS
1140                         { $$ = 1; }
1141         ;
1142
1143 memspec_opt:
1144                 '>' NAME
1145                 { $$ = $2; }
1146         |       { $$ = DEFAULT_MEMORY_REGION; }
1147         ;
1148
1149 phdr_opt:
1150                 /* empty */
1151                 {
1152                   $$ = NULL;
1153                 }
1154         |       phdr_opt ':' NAME
1155                 {
1156                   struct lang_output_section_phdr_list *n;
1157
1158                   n = ((struct lang_output_section_phdr_list *)
1159                        xmalloc (sizeof *n));
1160                   n->name = $3;
1161                   n->used = FALSE;
1162                   n->next = $1;
1163                   $$ = n;
1164                 }
1165         ;
1166
1167 overlay_section:
1168                 /* empty */
1169         |       overlay_section
1170                 NAME
1171                         {
1172                           ldlex_script ();
1173                           lang_enter_overlay_section ($2);
1174                         }
1175                 '{' statement_list_opt '}'
1176                         { ldlex_popstate (); ldlex_expression (); }
1177                 phdr_opt fill_opt
1178                         {
1179                           ldlex_popstate ();
1180                           lang_leave_overlay_section ($9, $8);
1181                         }
1182                 opt_comma
1183         ;
1184
1185 phdrs:
1186                 PHDRS '{' phdr_list '}'
1187         ;
1188
1189 phdr_list:
1190                 /* empty */
1191         |       phdr_list phdr
1192         ;
1193
1194 phdr:
1195                 NAME { ldlex_expression (); }
1196                   phdr_type phdr_qualifiers { ldlex_popstate (); }
1197                   ';'
1198                 {
1199                   lang_new_phdr ($1, $3, $4.filehdr, $4.phdrs, $4.at,
1200                                  $4.flags);
1201                 }
1202         ;
1203
1204 phdr_type:
1205                 exp
1206                 {
1207                   $$ = $1;
1208
1209                   if ($1->type.node_class == etree_name
1210                       && $1->type.node_code == NAME)
1211                     {
1212                       const char *s;
1213                       unsigned int i;
1214                       static const char * const phdr_types[] =
1215                         {
1216                           "PT_NULL", "PT_LOAD", "PT_DYNAMIC",
1217                           "PT_INTERP", "PT_NOTE", "PT_SHLIB",
1218                           "PT_PHDR", "PT_TLS"
1219                         };
1220
1221                       s = $1->name.name;
1222                       for (i = 0;
1223                            i < sizeof phdr_types / sizeof phdr_types[0];
1224                            i++)
1225                         if (strcmp (s, phdr_types[i]) == 0)
1226                           {
1227                             $$ = exp_intop (i);
1228                             break;
1229                           }
1230                       if (i == sizeof phdr_types / sizeof phdr_types[0])
1231                         {
1232                           if (strcmp (s, "PT_GNU_EH_FRAME") == 0)
1233                             $$ = exp_intop (0x6474e550);
1234                           else if (strcmp (s, "PT_GNU_STACK") == 0)
1235                             $$ = exp_intop (0x6474e551);
1236                           else
1237                             {
1238                               einfo (_("\
1239 %X%P:%S: unknown phdr type `%s' (try integer literal)\n"),
1240                                      NULL, s);
1241                               $$ = exp_intop (0);
1242                             }
1243                         }
1244                     }
1245                 }
1246         ;
1247
1248 phdr_qualifiers:
1249                 /* empty */
1250                 {
1251                   memset (&$$, 0, sizeof (struct phdr_info));
1252                 }
1253         |       NAME phdr_val phdr_qualifiers
1254                 {
1255                   $$ = $3;
1256                   if (strcmp ($1, "FILEHDR") == 0 && $2 == NULL)
1257                     $$.filehdr = TRUE;
1258                   else if (strcmp ($1, "PHDRS") == 0 && $2 == NULL)
1259                     $$.phdrs = TRUE;
1260                   else if (strcmp ($1, "FLAGS") == 0 && $2 != NULL)
1261                     $$.flags = $2;
1262                   else
1263                     einfo (_("%X%P:%S: PHDRS syntax error at `%s'\n"),
1264                            NULL, $1);
1265                 }
1266         |       AT '(' exp ')' phdr_qualifiers
1267                 {
1268                   $$ = $5;
1269                   $$.at = $3;
1270                 }
1271         ;
1272
1273 phdr_val:
1274                 /* empty */
1275                 {
1276                   $$ = NULL;
1277                 }
1278         | '(' exp ')'
1279                 {
1280                   $$ = $2;
1281                 }
1282         ;
1283
1284 dynamic_list_file:
1285                 {
1286                   ldlex_version_file ();
1287                   PUSH_ERROR (_("dynamic list"));
1288                 }
1289                 dynamic_list_nodes
1290                 {
1291                   ldlex_popstate ();
1292                   POP_ERROR ();
1293                 }
1294         ;
1295
1296 dynamic_list_nodes:
1297                 dynamic_list_node
1298         |       dynamic_list_nodes dynamic_list_node
1299         ;
1300
1301 dynamic_list_node:
1302                 '{' dynamic_list_tag '}' ';'
1303         ;
1304
1305 dynamic_list_tag:
1306                 vers_defns ';'
1307                 {
1308                   lang_append_dynamic_list ($1);
1309                 }
1310         ;
1311
1312 /* This syntax is used within an external version script file.  */
1313
1314 version_script_file:
1315                 {
1316                   ldlex_version_file ();
1317                   PUSH_ERROR (_("VERSION script"));
1318                 }
1319                 vers_nodes
1320                 {
1321                   ldlex_popstate ();
1322                   POP_ERROR ();
1323                 }
1324         ;
1325
1326 /* This is used within a normal linker script file.  */
1327
1328 version:
1329                 {
1330                   ldlex_version_script ();
1331                 }
1332                 VERSIONK '{' vers_nodes '}'
1333                 {
1334                   ldlex_popstate ();
1335                 }
1336         ;
1337
1338 vers_nodes:
1339                 vers_node
1340         |       vers_nodes vers_node
1341         ;
1342
1343 vers_node:
1344                 '{' vers_tag '}' ';'
1345                 {
1346                   lang_register_vers_node (NULL, $2, NULL);
1347                 }
1348         |       VERS_TAG '{' vers_tag '}' ';'
1349                 {
1350                   lang_register_vers_node ($1, $3, NULL);
1351                 }
1352         |       VERS_TAG '{' vers_tag '}' verdep ';'
1353                 {
1354                   lang_register_vers_node ($1, $3, $5);
1355                 }
1356         ;
1357
1358 verdep:
1359                 VERS_TAG
1360                 {
1361                   $$ = lang_add_vers_depend (NULL, $1);
1362                 }
1363         |       verdep VERS_TAG
1364                 {
1365                   $$ = lang_add_vers_depend ($1, $2);
1366                 }
1367         ;
1368
1369 vers_tag:
1370                 /* empty */
1371                 {
1372                   $$ = lang_new_vers_node (NULL, NULL);
1373                 }
1374         |       vers_defns ';'
1375                 {
1376                   $$ = lang_new_vers_node ($1, NULL);
1377                 }
1378         |       GLOBAL ':' vers_defns ';'
1379                 {
1380                   $$ = lang_new_vers_node ($3, NULL);
1381                 }
1382         |       LOCAL ':' vers_defns ';'
1383                 {
1384                   $$ = lang_new_vers_node (NULL, $3);
1385                 }
1386         |       GLOBAL ':' vers_defns ';' LOCAL ':' vers_defns ';'
1387                 {
1388                   $$ = lang_new_vers_node ($3, $7);
1389                 }
1390         ;
1391
1392 vers_defns:
1393                 VERS_IDENTIFIER
1394                 {
1395                   $$ = lang_new_vers_pattern (NULL, $1, ldgram_vers_current_lang, FALSE);
1396                 }
1397         |       NAME
1398                 {
1399                   $$ = lang_new_vers_pattern (NULL, $1, ldgram_vers_current_lang, TRUE);
1400                 }
1401         |       vers_defns ';' VERS_IDENTIFIER
1402                 {
1403                   $$ = lang_new_vers_pattern ($1, $3, ldgram_vers_current_lang, FALSE);
1404                 }
1405         |       vers_defns ';' NAME
1406                 {
1407                   $$ = lang_new_vers_pattern ($1, $3, ldgram_vers_current_lang, TRUE);
1408                 }
1409         |       vers_defns ';' EXTERN NAME '{'
1410                         {
1411                           $<name>$ = ldgram_vers_current_lang;
1412                           ldgram_vers_current_lang = $4;
1413                         }
1414                 vers_defns opt_semicolon '}'
1415                         {
1416                           struct bfd_elf_version_expr *pat;
1417                           for (pat = $7; pat->next != NULL; pat = pat->next);
1418                           pat->next = $1;
1419                           $$ = $7;
1420                           ldgram_vers_current_lang = $<name>6;
1421                         }
1422         |       EXTERN NAME '{'
1423                         {
1424                           $<name>$ = ldgram_vers_current_lang;
1425                           ldgram_vers_current_lang = $2;
1426                         }
1427                 vers_defns opt_semicolon '}'
1428                         {
1429                           $$ = $5;
1430                           ldgram_vers_current_lang = $<name>4;
1431                         }
1432         |       GLOBAL
1433                 {
1434                   $$ = lang_new_vers_pattern (NULL, "global", ldgram_vers_current_lang, FALSE);
1435                 }
1436         |       vers_defns ';' GLOBAL
1437                 {
1438                   $$ = lang_new_vers_pattern ($1, "global", ldgram_vers_current_lang, FALSE);
1439                 }
1440         |       LOCAL
1441                 {
1442                   $$ = lang_new_vers_pattern (NULL, "local", ldgram_vers_current_lang, FALSE);
1443                 }
1444         |       vers_defns ';' LOCAL
1445                 {
1446                   $$ = lang_new_vers_pattern ($1, "local", ldgram_vers_current_lang, FALSE);
1447                 }
1448         |       EXTERN
1449                 {
1450                   $$ = lang_new_vers_pattern (NULL, "extern", ldgram_vers_current_lang, FALSE);
1451                 }
1452         |       vers_defns ';' EXTERN
1453                 {
1454                   $$ = lang_new_vers_pattern ($1, "extern", ldgram_vers_current_lang, FALSE);
1455                 }
1456         ;
1457
1458 opt_semicolon:
1459                 /* empty */
1460         |       ';'
1461         ;
1462
1463 %%
1464 void
1465 yyerror(arg)
1466      const char *arg;
1467 {
1468   if (ldfile_assumed_script)
1469     einfo (_("%P:%s: file format not recognized; treating as linker script\n"),
1470            ldlex_filename ());
1471   if (error_index > 0 && error_index < ERROR_NAME_MAX)
1472     einfo ("%P%F:%S: %s in %s\n", NULL, arg, error_names[error_index - 1]);
1473   else
1474     einfo ("%P%F:%S: %s\n", NULL, arg);
1475 }