ld/ldgram.y

   1 /* A YACC grammer to parse a superset of the AT&T linker scripting languaue.
   2    Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 1999
   3    Free Software Foundation, Inc.
   4    Written by Steve Chamberlain of Cygnus Support (steve@cygnus.com).
   5
   6 This file is part of GNU ld.
   7
   8 This program is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2 of the License, or
  11 (at your option) any later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program; if not, write to the Free Software
  20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  21
  22 %{
  23 /*
  24
  25  */
  26
  27 #define DONTDECLARE_MALLOC
  28
  29 #include "bfd.h"
  30 #include "sysdep.h"
  31 #include "bfdlink.h"
  32 #include "ld.h"
  33 #include "ldexp.h"
  34 #include "ldver.h"
  35 #include "ldlang.h"
  36 #include "ldemul.h"
  37 #include "ldfile.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
  50 lang_memory_region_type *region;
  51
  52 struct wildcard_spec current_file;
  53 boolean ldgram_want_filename = true;
  54 boolean had_script = false;
  55 boolean force_make_executable = false;
  56
  57 boolean ldgram_in_script = false;
  58 boolean ldgram_had_equals = false;
  59 boolean ldgram_had_keep = false;
  60 char *ldgram_vers_current_lang = NULL;
  61
  62 #define ERROR_NAME_MAX 20
  63 static char *error_names[ERROR_NAME_MAX];
  64 static int error_index;
  65 #define PUSH_ERROR(x) if (error_index < ERROR_NAME_MAX) error_names[error_index] = x; error_index++;
  66 #define POP_ERROR()   error_index--;
  67 %}
  68 %union {
  69   bfd_vma integer;
  70   char *name;
  71   const char *cname;
  72   struct wildcard_spec wildcard;
  73   int token;
  74   union etree_union *etree;
  75   struct phdr_info
  76     {
  77       boolean filehdr;
  78       boolean phdrs;
  79       union etree_union *at;
  80       union etree_union *flags;
  81     } phdr;
  82   struct lang_nocrossref *nocrossref;
  83   struct lang_output_section_phdr_list *section_phdr;
  84   struct bfd_elf_version_deps *deflist;
  85   struct bfd_elf_version_expr *versyms;
  86   struct bfd_elf_version_tree *versnode;
  87 }
  88
  89 %type <etree> exp opt_exp_with_type mustbe_exp opt_at phdr_type phdr_val
  90 %type <etree> opt_exp_without_type
  91 %type <integer> fill_opt
  92 %type <name> memspec_opt casesymlist
  93 %type <cname> wildcard_name
  94 %type <wildcard> wildcard_spec
  95 %token <integer> INT
  96 %token <name> NAME LNAME
  97 %type <integer> length
  98 %type <phdr> phdr_qualifiers
  99 %type <nocrossref> nocrossref_list
 100 %type <section_phdr> phdr_opt
 101 %type <integer> opt_nocrossrefs
 102
 103 %right <token> PLUSEQ MINUSEQ MULTEQ DIVEQ  '=' LSHIFTEQ RSHIFTEQ   ANDEQ OREQ
 104 %right <token> '?' ':'
 105 %left <token> OROR
 106 %left <token>  ANDAND
 107 %left <token> '|'
 108 %left <token>  '^'
 109 %left  <token> '&'
 110 %left <token>  EQ NE
 111 %left  <token> '<' '>' LE GE
 112 %left  <token> LSHIFT RSHIFT
 113
 114 %left  <token> '+' '-'
 115 %left  <token> '*' '/' '%'
 116
 117 %right UNARY
 118 %token END
 119 %left <token> '('
 120 %token <token> ALIGN_K BLOCK BIND QUAD SQUAD LONG SHORT BYTE
 121 %token SECTIONS PHDRS SORT
 122 %token '{' '}'
 123 %token SIZEOF_HEADERS OUTPUT_FORMAT FORCE_COMMON_ALLOCATION OUTPUT_ARCH
 124 %token SIZEOF_HEADERS
 125 %token INCLUDE
 126 %token MEMORY DEFSYMEND
 127 %token NOLOAD DSECT COPY INFO OVERLAY
 128 %token NAME LNAME DEFINED TARGET_K SEARCH_DIR MAP ENTRY
 129 %token <integer> NEXT
 130 %token SIZEOF ADDR LOADADDR MAX_K MIN_K
 131 %token STARTUP HLL SYSLIB FLOAT NOFLOAT NOCROSSREFS
 132 %token ORIGIN FILL
 133 %token LENGTH CREATE_OBJECT_SYMBOLS INPUT GROUP OUTPUT CONSTRUCTORS
 134 %token ALIGNMOD AT PROVIDE
 135 %type <token> assign_op atype attributes_opt
 136 %type <name>  filename
 137 %token CHIP LIST SECT ABSOLUTE  LOAD NEWLINE ENDWORD ORDER NAMEWORD ASSERT_K
 138 %token FORMAT PUBLIC DEFSYMEND BASE ALIAS TRUNCATE REL
 139 %token INPUT_SCRIPT INPUT_MRI_SCRIPT INPUT_DEFSYM CASE EXTERN START
 140 %token <name> VERS_TAG VERS_IDENTIFIER
 141 %token GLOBAL LOCAL VERSIONK INPUT_VERSION_SCRIPT
 142 %token KEEP
 143 %token EXCLUDE_FILE
 144 %type <versyms> vers_defns
 145 %type <versnode> vers_tag
 146 %type <deflist> verdep
 147
 148 %%
 149
 150 file:
 151                 INPUT_SCRIPT script_file
 152         |       INPUT_MRI_SCRIPT mri_script_file
 153         |       INPUT_VERSION_SCRIPT version_script_file
 154         |       INPUT_DEFSYM defsym_expr
 155         ;
 156
 157
 158 filename:  NAME;
 159
 160
 161 defsym_expr:
 162                 { ldlex_defsym(); }
 163                 NAME '=' exp
 164                 {
 165                   ldlex_popstate();
 166                   lang_add_assignment(exp_assop($3,$2,$4));
 167                 }
 168
 169 /* SYNTAX WITHIN AN MRI SCRIPT FILE */
 170 mri_script_file:
 171                 {
 172                   ldlex_mri_script ();
 173                   PUSH_ERROR (_("MRI style script"));
 174                 }
 175              mri_script_lines
 176                 {
 177                   ldlex_popstate ();
 178                   mri_draw_tree ();
 179                   POP_ERROR ();
 180                 }
 181         ;
 182
 183 mri_script_lines:
 184                 mri_script_lines mri_script_command NEWLINE
 185           |
 186         ;
 187
 188 mri_script_command:
 189                 CHIP  exp
 190         |       CHIP  exp ',' exp
 191         |       NAME    {
 192                         einfo(_("%P%F: unrecognised keyword in MRI style script '%s'\n"),$1);
 193                         }
 194         |       LIST    {
 195                         config.map_filename = "-";
 196                         }
 197         |       ORDER ordernamelist
 198         |       ENDWORD
 199         |       PUBLIC NAME '=' exp
 200                         { mri_public($2, $4); }
 201         |       PUBLIC NAME ',' exp
 202                         { mri_public($2, $4); }
 203         |       PUBLIC NAME  exp
 204                         { mri_public($2, $3); }
 205         |       FORMAT NAME
 206                         { mri_format($2); }
 207         |       SECT NAME ',' exp
 208                         { mri_output_section($2, $4);}
 209         |       SECT NAME  exp
 210                         { mri_output_section($2, $3);}
 211         |       SECT NAME '=' exp
 212                         { mri_output_section($2, $4);}
 213         |       ALIGN_K NAME '=' exp
 214                         { mri_align($2,$4); }
 215         |       ALIGN_K NAME ',' exp
 216                         { mri_align($2,$4); }
 217         |       ALIGNMOD NAME '=' exp
 218                         { mri_alignmod($2,$4); }
 219         |       ALIGNMOD NAME ',' exp
 220                         { mri_alignmod($2,$4); }
 221         |       ABSOLUTE mri_abs_name_list
 222         |       LOAD     mri_load_name_list
 223         |       NAMEWORD NAME
 224                         { mri_name($2); }
 225         |       ALIAS NAME ',' NAME
 226                         { mri_alias($2,$4,0);}
 227         |       ALIAS NAME ',' INT
 228                         { mri_alias($2,0,(int) $4);}
 229         |       BASE     exp
 230                         { mri_base($2); }
 231         |       TRUNCATE INT
 232                 {  mri_truncate((unsigned int) $2); }
 233         |       CASE casesymlist
 234         |       EXTERN extern_name_list
 235         |       INCLUDE filename
 236                 { ldfile_open_command_file ($2); } mri_script_lines END
 237         |       START NAME
 238                 { lang_add_entry ($2, false); }
 239         |
 240         ;
 241
 242 ordernamelist:
 243               ordernamelist ',' NAME         { mri_order($3); }
 244         |     ordernamelist  NAME         { mri_order($2); }
 245         |
 246         ;
 247
 248 mri_load_name_list:
 249                 NAME
 250                         { mri_load($1); }
 251         |       mri_load_name_list ',' NAME { mri_load($3); }
 252         ;
 253
 254 mri_abs_name_list:
 255                 NAME
 256                         { mri_only_load($1); }
 257         |       mri_abs_name_list ','  NAME
 258                         { mri_only_load($3); }
 259         ;
 260
 261 casesymlist:
 262           /* empty */ { $$ = NULL; }
 263         | NAME
 264         | casesymlist ',' NAME
 265         ;
 266
 267 extern_name_list:
 268           NAME
 269                         { ldlang_add_undef ($1); }
 270         | extern_name_list NAME
 271                         { ldlang_add_undef ($2); }
 272         | extern_name_list ',' NAME
 273                         { ldlang_add_undef ($3); }
 274         ;
 275
 276 script_file:
 277         {
 278          ldlex_both();
 279         }
 280        ifile_list
 281         {
 282         ldlex_popstate();
 283         }
 284         ;
 285
 286
 287 ifile_list:
 288        ifile_list ifile_p1
 289         |
 290         ;
 291
 292
 293
 294 ifile_p1:
 295                 memory
 296         |       sections
 297         |       phdrs
 298         |       startup
 299         |       high_level_library
 300         |       low_level_library
 301         |       floating_point_support
 302         |       statement_anywhere
 303         |       version
 304         |        ';'
 305         |       TARGET_K '(' NAME ')'
 306                 { lang_add_target($3); }
 307         |       SEARCH_DIR '(' filename ')'
 308                 { ldfile_add_library_path ($3, false); }
 309         |       OUTPUT '(' filename ')'
 310                 { lang_add_output($3, 1); }
 311         |       OUTPUT_FORMAT '(' NAME ')'
 312                   { lang_add_output_format ($3, (char *) NULL,
 313                                             (char *) NULL, 1); }
 314         |       OUTPUT_FORMAT '(' NAME ',' NAME ',' NAME ')'
 315                   { lang_add_output_format ($3, $5, $7, 1); }
 316         |       OUTPUT_ARCH '(' NAME ')'
 317                   { ldfile_set_output_arch($3); }
 318         |       FORCE_COMMON_ALLOCATION
 319                 { command_line.force_common_definition = true ; }
 320         |       INPUT '(' input_list ')'
 321         |       GROUP
 322                   { lang_enter_group (); }
 323                     '(' input_list ')'
 324                   { lang_leave_group (); }
 325         |       MAP '(' filename ')'
 326                 { lang_add_map($3); }
 327         |       INCLUDE filename
 328                 { ldfile_open_command_file($2); } ifile_list END
 329         |       NOCROSSREFS '(' nocrossref_list ')'
 330                 {
 331                   lang_add_nocrossref ($3);
 332                 }
 333         |       EXTERN '(' extern_name_list ')'
 334         ;
 335
 336 input_list:
 337                 NAME
 338                 { lang_add_input_file($1,lang_input_file_is_search_file_enum,
 339                                  (char *)NULL); }
 340         |       input_list ',' NAME
 341                 { lang_add_input_file($3,lang_input_file_is_search_file_enum,
 342                                  (char *)NULL); }
 343         |       input_list NAME
 344                 { lang_add_input_file($2,lang_input_file_is_search_file_enum,
 345                                  (char *)NULL); }
 346         |       LNAME
 347                 { lang_add_input_file($1,lang_input_file_is_l_enum,
 348                                  (char *)NULL); }
 349         |       input_list ',' LNAME
 350                 { lang_add_input_file($3,lang_input_file_is_l_enum,
 351                                  (char *)NULL); }
 352         |       input_list LNAME
 353                 { lang_add_input_file($2,lang_input_file_is_l_enum,
 354                                  (char *)NULL); }
 355         ;
 356
 357 sections:
 358                 SECTIONS '{' sec_or_group_p1 '}'
 359         ;
 360
 361 sec_or_group_p1:
 362                 sec_or_group_p1 section
 363         |       sec_or_group_p1 statement_anywhere
 364         |
 365         ;
 366
 367 statement_anywhere:
 368                 ENTRY '(' NAME ')'
 369                 { lang_add_entry ($3, false); }
 370         |       assignment end
 371         ;
 372
 373 /* The '*' and '?' cases are there because the lexer returns them as
 374    separate tokens rather than as NAME.  */
 375 wildcard_name:
 376                 NAME
 377                         {
 378                           $$ = $1;
 379                         }
 380         |       '*'
 381                         {
 382                           $$ = "*";
 383                         }
 384         |       '?'
 385                         {
 386                           $$ = "?";
 387                         }
 388         ;
 389
 390 wildcard_spec:
 391                 wildcard_name
 392                         {
 393                           $$.name = $1;
 394                           $$.sorted = false;
 395                           $$.exclude_name = NULL;
 396                         }
 397         |       EXCLUDE_FILE '(' wildcard_name ')' wildcard_name
 398                         {
 399                           $$.name = $5;
 400                           $$.sorted = false;
 401                           $$.exclude_name = $3;
 402                         }
 403         |       SORT '(' wildcard_name ')'
 404                         {
 405                           $$.name = $3;
 406                           $$.sorted = true;
 407                           $$.exclude_name = NULL;
 408                         }
 409         |       SORT '(' EXCLUDE_FILE '(' wildcard_name ')' wildcard_name ')'
 410                         {
 411                           $$.name = $7;
 412                           $$.sorted = true;
 413                           $$.exclude_name = $5;
 414                         }
 415         ;
 416
 417
 418 file_NAME_list:
 419                 wildcard_spec
 420                         {
 421                           lang_add_wild ($1.name, $1.sorted,
 422                                          current_file.name,
 423                                          current_file.sorted,
 424                                          ldgram_had_keep, $1.exclude_name);
 425                         }
 426         |       file_NAME_list opt_comma wildcard_spec
 427                         {
 428                           lang_add_wild ($3.name, $3.sorted,
 429                                          current_file.name,
 430                                          current_file.sorted,
 431                                          ldgram_had_keep, $3.exclude_name);
 432                         }
 433         ;
 434
 435 input_section_spec_no_keep:
 436                 NAME
 437                         {
 438                           lang_add_wild (NULL, false, $1, false,
 439                                          ldgram_had_keep, NULL);
 440                         }
 441         |       '['
 442                         {
 443                           current_file.name = NULL;
 444                           current_file.sorted = false;
 445                         }
 446                 file_NAME_list ']'
 447         |       wildcard_spec
 448                         {
 449                           current_file = $1;
 450                           /* '*' matches any file name.  */
 451                           if (strcmp (current_file.name, "*") == 0)
 452                             current_file.name = NULL;
 453                         }
 454                 '(' file_NAME_list ')'
 455         ;
 456
 457 input_section_spec:
 458                 input_section_spec_no_keep
 459         |       KEEP '('
 460                         { ldgram_had_keep = true; }
 461                 input_section_spec_no_keep ')'
 462                         { ldgram_had_keep = false; }
 463         ;
 464
 465 statement:
 466                 assignment end
 467         |       CREATE_OBJECT_SYMBOLS
 468                 {
 469                 lang_add_attribute(lang_object_symbols_statement_enum);
 470                 }
 471         |       ';'
 472         |       CONSTRUCTORS
 473                 {
 474
 475                   lang_add_attribute(lang_constructors_statement_enum);
 476                 }
 477         | SORT '(' CONSTRUCTORS ')'
 478                 {
 479                   constructors_sorted = true;
 480                   lang_add_attribute (lang_constructors_statement_enum);
 481                 }
 482         | input_section_spec
 483         | length '(' mustbe_exp ')'
 484                         {
 485                         lang_add_data((int) $1,$3);
 486                         }
 487
 488         | FILL '(' mustbe_exp ')'
 489                         {
 490                           lang_add_fill
 491                             (exp_get_value_int($3,
 492                                                0,
 493                                                "fill value",
 494                                                lang_first_phase_enum));
 495                         }
 496         ;
 497
 498 statement_list:
 499                 statement_list statement
 500         |       statement
 501         ;
 502
 503 statement_list_opt:
 504                 /* empty */
 505         |       statement_list
 506         ;
 507
 508 length:
 509                 QUAD
 510                         { $$ = $1; }
 511         |       SQUAD
 512                         { $$ = $1; }
 513         |       LONG
 514                         { $$ = $1; }
 515         |       SHORT
 516                         { $$ = $1; }
 517         |       BYTE
 518                         { $$ = $1; }
 519         ;
 520
 521 fill_opt:
 522           '=' mustbe_exp
 523                 {
 524                   $$ =   exp_get_value_int($2,
 525                                            0,
 526                                            "fill value",
 527                                            lang_first_phase_enum);
 528                 }
 529         |       { $$ = 0; }
 530         ;
 531
 532
 533
 534 assign_op:
 535                 PLUSEQ
 536                         { $$ = '+'; }
 537         |       MINUSEQ
 538                         { $$ = '-'; }
 539         |       MULTEQ
 540                         { $$ = '*'; }
 541         |       DIVEQ
 542                         { $$ = '/'; }
 543         |       LSHIFTEQ
 544                         { $$ = LSHIFT; }
 545         |       RSHIFTEQ
 546                         { $$ = RSHIFT; }
 547         |       ANDEQ
 548                         { $$ = '&'; }
 549         |       OREQ
 550                         { $$ = '|'; }
 551
 552         ;
 553
 554 end:    ';' | ','
 555         ;
 556
 557
 558 assignment:
 559                 NAME '=' mustbe_exp
 560                 {
 561                   lang_add_assignment (exp_assop ($2, $1, $3));
 562                 }
 563         |       NAME assign_op mustbe_exp
 564                 {
 565                   lang_add_assignment (exp_assop ('=', $1,
 566                                                   exp_binop ($2,
 567                                                              exp_nameop (NAME,
 568                                                                          $1),
 569                                                              $3)));
 570                 }
 571         |       PROVIDE '(' NAME '=' mustbe_exp ')'
 572                 {
 573                   lang_add_assignment (exp_provide ($3, $5));
 574                 }
 575         ;
 576
 577
 578 opt_comma:
 579                 ','     |       ;
 580
 581
 582 memory:
 583                 MEMORY '{' memory_spec memory_spec_list '}'
 584         ;
 585
 586 memory_spec_list:
 587                 memory_spec_list memory_spec
 588         |       memory_spec_list ',' memory_spec
 589         |
 590         ;
 591
 592
 593 memory_spec:            NAME
 594                         { region = lang_memory_region_lookup($1); }
 595                 attributes_opt ':'
 596                 origin_spec opt_comma length_spec
 597
 598         ; origin_spec:
 599         ORIGIN '=' mustbe_exp
 600                 { region->current =
 601                  region->origin =
 602                  exp_get_vma($3, 0L,"origin", lang_first_phase_enum);
 603 }
 604         ;
 605
 606 length_spec:
 607              LENGTH '=' mustbe_exp
 608                { region->length = exp_get_vma($3,
 609                                                ~((bfd_vma)0),
 610                                                "length",
 611                                                lang_first_phase_enum);
 612                 }
 613         ;
 614
 615 attributes_opt:
 616                 /* empty */
 617                   { /* dummy action to avoid bison 1.25 error message */ }
 618         |       '(' attributes_list ')'
 619         ;
 620
 621 attributes_list:
 622                 attributes_string
 623         |       attributes_list attributes_string
 624         ;
 625
 626 attributes_string:
 627                 NAME
 628                   { lang_set_flags (region, $1, 0); }
 629         |       '!' NAME
 630                   { lang_set_flags (region, $2, 1); }
 631         ;
 632
 633 startup:
 634         STARTUP '(' filename ')'
 635                 { lang_startup($3); }
 636         ;
 637
 638 high_level_library:
 639                 HLL '(' high_level_library_NAME_list ')'
 640         |       HLL '(' ')'
 641                         { ldemul_hll((char *)NULL); }
 642         ;
 643
 644 high_level_library_NAME_list:
 645                 high_level_library_NAME_list opt_comma filename
 646                         { ldemul_hll($3); }
 647         |       filename
 648                         { ldemul_hll($1); }
 649
 650         ;
 651
 652 low_level_library:
 653         SYSLIB '(' low_level_library_NAME_list ')'
 654         ; low_level_library_NAME_list:
 655                 low_level_library_NAME_list opt_comma filename
 656                         { ldemul_syslib($3); }
 657         |
 658         ;
 659
 660 floating_point_support:
 661                 FLOAT
 662                         { lang_float(true); }
 663         |       NOFLOAT
 664                         { lang_float(false); }
 665         ;
 666
 667 nocrossref_list:
 668                 /* empty */
 669                 {
 670                   $$ = NULL;
 671                 }
 672         |       NAME nocrossref_list
 673                 {
 674                   struct lang_nocrossref *n;
 675
 676                   n = (struct lang_nocrossref *) xmalloc (sizeof *n);
 677                   n->name = $1;
 678                   n->next = $2;
 679                   $$ = n;
 680                 }
 681         |       NAME ',' nocrossref_list
 682                 {
 683                   struct lang_nocrossref *n;
 684
 685                   n = (struct lang_nocrossref *) xmalloc (sizeof *n);
 686                   n->name = $1;
 687                   n->next = $3;
 688                   $$ = n;
 689                 }
 690         ;
 691
 692 mustbe_exp:              { ldlex_expression(); }
 693                 exp
 694                          { ldlex_popstate(); $$=$2;}
 695         ;
 696
 697 exp     :
 698                 '-' exp %prec UNARY
 699                         { $$ = exp_unop('-', $2); }
 700         |       '(' exp ')'
 701                         { $$ = $2; }
 702         |       NEXT '(' exp ')' %prec UNARY
 703                         { $$ = exp_unop((int) $1,$3); }
 704         |       '!' exp %prec UNARY
 705                         { $$ = exp_unop('!', $2); }
 706         |       '+' exp %prec UNARY
 707                         { $$ = $2; }
 708         |       '~' exp %prec UNARY
 709                         { $$ = exp_unop('~', $2);}
 710
 711         |       exp '*' exp
 712                         { $$ = exp_binop('*', $1, $3); }
 713         |       exp '/' exp
 714                         { $$ = exp_binop('/', $1, $3); }
 715         |       exp '%' exp
 716                         { $$ = exp_binop('%', $1, $3); }
 717         |       exp '+' exp
 718                         { $$ = exp_binop('+', $1, $3); }
 719         |       exp '-' exp
 720                         { $$ = exp_binop('-' , $1, $3); }
 721         |       exp LSHIFT exp
 722                         { $$ = exp_binop(LSHIFT , $1, $3); }
 723         |       exp RSHIFT exp
 724                         { $$ = exp_binop(RSHIFT , $1, $3); }
 725         |       exp EQ exp
 726                         { $$ = exp_binop(EQ , $1, $3); }
 727         |       exp NE exp
 728                         { $$ = exp_binop(NE , $1, $3); }
 729         |       exp LE exp
 730                         { $$ = exp_binop(LE , $1, $3); }
 731         |       exp GE exp
 732                         { $$ = exp_binop(GE , $1, $3); }
 733         |       exp '<' exp
 734                         { $$ = exp_binop('<' , $1, $3); }
 735         |       exp '>' exp
 736                         { $$ = exp_binop('>' , $1, $3); }
 737         |       exp '&' exp
 738                         { $$ = exp_binop('&' , $1, $3); }
 739         |       exp '^' exp
 740                         { $$ = exp_binop('^' , $1, $3); }
 741         |       exp '|' exp
 742                         { $$ = exp_binop('|' , $1, $3); }
 743         |       exp '?' exp ':' exp
 744                         { $$ = exp_trinop('?' , $1, $3, $5); }
 745         |       exp ANDAND exp
 746                         { $$ = exp_binop(ANDAND , $1, $3); }
 747         |       exp OROR exp
 748                         { $$ = exp_binop(OROR , $1, $3); }
 749         |       DEFINED '(' NAME ')'
 750                         { $$ = exp_nameop(DEFINED, $3); }
 751         |       INT
 752                         { $$ = exp_intop($1); }
 753         |       SIZEOF_HEADERS
 754                         { $$ = exp_nameop(SIZEOF_HEADERS,0); }
 755
 756         |       SIZEOF '(' NAME ')'
 757                         { $$ = exp_nameop(SIZEOF,$3); }
 758         |       ADDR '(' NAME ')'
 759                         { $$ = exp_nameop(ADDR,$3); }
 760         |       LOADADDR '(' NAME ')'
 761                         { $$ = exp_nameop(LOADADDR,$3); }
 762         |       ABSOLUTE '(' exp ')'
 763                         { $$ = exp_unop(ABSOLUTE, $3); }
 764         |       ALIGN_K '(' exp ')'
 765                         { $$ = exp_unop(ALIGN_K,$3); }
 766         |       BLOCK '(' exp ')'
 767                         { $$ = exp_unop(ALIGN_K,$3); }
 768         |       NAME
 769                         { $$ = exp_nameop(NAME,$1); }
 770         |       MAX_K '(' exp ',' exp ')'
 771                         { $$ = exp_binop (MAX_K, $3, $5 ); }
 772         |       MIN_K '(' exp ',' exp ')'
 773                         { $$ = exp_binop (MIN_K, $3, $5 ); }
 774         |       ASSERT_K '(' exp ',' NAME ')'
 775                         { $$ = exp_assert ($3, $5); }
 776         ;
 777
 778
 779 opt_at:
 780                 AT '(' exp ')' { $$ = $3; }
 781         |       { $$ = 0; }
 782         ;
 783
 784 section:        NAME            { ldlex_expression(); }
 785                 opt_exp_with_type
 786                 opt_at          { ldlex_popstate (); ldlex_script (); }
 787                 '{'
 788                         {
 789                           lang_enter_output_section_statement($1, $3,
 790                                                               sectype,
 791                                                               0, 0, 0, $4);
 792                         }
 793                 statement_list_opt
 794                 '}' { ldlex_popstate (); ldlex_expression (); }
 795                 memspec_opt phdr_opt fill_opt
 796                 {
 797                   ldlex_popstate ();
 798                   lang_leave_output_section_statement ($13, $11, $12);
 799                 }
 800                 opt_comma
 801         |       OVERLAY
 802                         { ldlex_expression (); }
 803                 opt_exp_without_type opt_nocrossrefs opt_at
 804                         { ldlex_popstate (); ldlex_script (); }
 805                 '{'
 806                         {
 807                           lang_enter_overlay ($3, $5, (int) $4);
 808                         }
 809                 overlay_section
 810                 '}'
 811                         { ldlex_popstate (); ldlex_expression (); }
 812                 memspec_opt phdr_opt fill_opt
 813                         {
 814                           ldlex_popstate ();
 815                           lang_leave_overlay ($14, $12, $13);
 816                         }
 817                 opt_comma
 818         |       /* The GROUP case is just enough to support the gcc
 819                    svr3.ifile script.  It is not intended to be full
 820                    support.  I'm not even sure what GROUP is supposed
 821                    to mean.  */
 822                 GROUP { ldlex_expression (); }
 823                 opt_exp_with_type
 824                 {
 825                   ldlex_popstate ();
 826                   lang_add_assignment (exp_assop ('=', ".", $3));
 827                 }
 828                 '{' sec_or_group_p1 '}'
 829         ;
 830
 831 type:
 832            NOLOAD  { sectype = noload_section; }
 833         |  DSECT   { sectype = dsect_section; }
 834         |  COPY    { sectype = copy_section; }
 835         |  INFO    { sectype = info_section; }
 836         |  OVERLAY { sectype = overlay_section; }
 837         ;
 838
 839 atype:
 840                 '(' type ')'
 841         |       /* EMPTY */ { sectype = normal_section; }
 842         |       '(' ')' { sectype = normal_section; }
 843         ;
 844
 845 opt_exp_with_type:
 846                 exp atype ':'           { $$ = $1; }
 847         |       atype ':'               { $$ = (etree_type *)NULL;  }
 848         |       /* The BIND cases are to support the gcc svr3.ifile
 849                    script.  They aren't intended to implement full
 850                    support for the BIND keyword.  I'm not even sure
 851                    what BIND is supposed to mean.  */
 852                 BIND '(' exp ')' atype ':' { $$ = $3; }
 853         |       BIND '(' exp ')' BLOCK '(' exp ')' atype ':'
 854                 { $$ = $3; }
 855         ;
 856
 857 opt_exp_without_type:
 858                 exp ':'         { $$ = $1; }
 859         |       ':'             { $$ = (etree_type *) NULL;  }
 860         ;
 861
 862 opt_nocrossrefs:
 863                 /* empty */
 864                         { $$ = 0; }
 865         |       NOCROSSREFS
 866                         { $$ = 1; }
 867         ;
 868
 869 memspec_opt:
 870                 '>' NAME
 871                 { $$ = $2; }
 872         |       { $$ = "*default*"; }
 873         ;
 874
 875 phdr_opt:
 876                 /* empty */
 877                 {
 878                   $$ = NULL;
 879                 }
 880         |       phdr_opt ':' NAME
 881                 {
 882                   struct lang_output_section_phdr_list *n;
 883
 884                   n = ((struct lang_output_section_phdr_list *)
 885                        xmalloc (sizeof *n));
 886                   n->name = $3;
 887                   n->used = false;
 888                   n->next = $1;
 889                   $$ = n;
 890                 }
 891         ;
 892
 893 overlay_section:
 894                 /* empty */
 895         |       overlay_section
 896                 NAME
 897                         {
 898                           ldlex_script ();
 899                           lang_enter_overlay_section ($2);
 900                         }
 901                 '{' statement_list_opt '}'
 902                         { ldlex_popstate (); ldlex_expression (); }
 903                 phdr_opt fill_opt
 904                         {
 905                           ldlex_popstate ();
 906                           lang_leave_overlay_section ($9, $8);
 907                         }
 908                 opt_comma
 909         ;
 910
 911 phdrs:
 912                 PHDRS '{' phdr_list '}'
 913         ;
 914
 915 phdr_list:
 916                 /* empty */
 917         |       phdr_list phdr
 918         ;
 919
 920 phdr:
 921                 NAME { ldlex_expression (); }
 922                   phdr_type phdr_qualifiers { ldlex_popstate (); }
 923                   ';'
 924                 {
 925                   lang_new_phdr ($1, $3, $4.filehdr, $4.phdrs, $4.at,
 926                                  $4.flags);
 927                 }
 928         ;
 929
 930 phdr_type:
 931                 exp
 932                 {
 933                   $$ = $1;
 934
 935                   if ($1->type.node_class == etree_name
 936                       && $1->type.node_code == NAME)
 937                     {
 938                       const char *s;
 939                       unsigned int i;
 940                       static const char * const phdr_types[] =
 941                         {
 942                           "PT_NULL", "PT_LOAD", "PT_DYNAMIC",
 943                           "PT_INTERP", "PT_NOTE", "PT_SHLIB",
 944                           "PT_PHDR"
 945                         };
 946
 947                       s = $1->name.name;
 948                       for (i = 0;
 949                            i < sizeof phdr_types / sizeof phdr_types[0];
 950                            i++)
 951                         if (strcmp (s, phdr_types[i]) == 0)
 952                           {
 953                             $$ = exp_intop (i);
 954                             break;
 955                           }
 956                     }
 957                 }
 958         ;
 959
 960 phdr_qualifiers:
 961                 /* empty */
 962                 {
 963                   memset (&$$, 0, sizeof (struct phdr_info));
 964                 }
 965         |       NAME phdr_val phdr_qualifiers
 966                 {
 967                   $$ = $3;
 968                   if (strcmp ($1, "FILEHDR") == 0 && $2 == NULL)
 969                     $$.filehdr = true;
 970                   else if (strcmp ($1, "PHDRS") == 0 && $2 == NULL)
 971                     $$.phdrs = true;
 972                   else if (strcmp ($1, "FLAGS") == 0 && $2 != NULL)
 973                     $$.flags = $2;
 974                   else
 975                     einfo (_("%X%P:%S: PHDRS syntax error at `%s'\n"), $1);
 976                 }
 977         |       AT '(' exp ')' phdr_qualifiers
 978                 {
 979                   $$ = $5;
 980                   $$.at = $3;
 981                 }
 982         ;
 983
 984 phdr_val:
 985                 /* empty */
 986                 {
 987                   $$ = NULL;
 988                 }
 989         | '(' exp ')'
 990                 {
 991                   $$ = $2;
 992                 }
 993         ;
 994
 995 /* This syntax is used within an external version script file.  */
 996
 997 version_script_file:
 998                 {
 999                   ldlex_version_file ();
1000                   PUSH_ERROR (_("VERSION script"));
1001                 }
1002                 vers_nodes
1003                 {
1004                   ldlex_popstate ();
1005                   POP_ERROR ();
1006                 }
1007         ;
1008
1009 /* This is used within a normal linker script file.  */
1010
1011 version:
1012                 {
1013                   ldlex_version_script ();
1014                 }
1015                 VERSIONK '{' vers_nodes '}'
1016                 {
1017                   ldlex_popstate ();
1018                 }
1019         ;
1020
1021 vers_nodes:
1022                 vers_node
1023         |       vers_nodes vers_node
1024         ;
1025
1026 vers_node:
1027                 VERS_TAG '{' vers_tag '}' ';'
1028                 {
1029                   lang_register_vers_node ($1, $3, NULL);
1030                 }
1031         |       VERS_TAG '{' vers_tag '}' verdep ';'
1032                 {
1033                   lang_register_vers_node ($1, $3, $5);
1034                 }
1035         ;
1036
1037 verdep:
1038                 VERS_TAG
1039                 {
1040                   $$ = lang_add_vers_depend (NULL, $1);
1041                 }
1042         |       verdep VERS_TAG
1043                 {
1044                   $$ = lang_add_vers_depend ($1, $2);
1045                 }
1046         ;
1047
1048 vers_tag:
1049                 /* empty */
1050                 {
1051                   $$ = lang_new_vers_node (NULL, NULL);
1052                 }
1053         |       vers_defns ';'
1054                 {
1055                   $$ = lang_new_vers_node ($1, NULL);
1056                 }
1057         |       GLOBAL ':' vers_defns ';'
1058                 {
1059                   $$ = lang_new_vers_node ($3, NULL);
1060                 }
1061         |       LOCAL ':' vers_defns ';'
1062                 {
1063                   $$ = lang_new_vers_node (NULL, $3);
1064                 }
1065         |       GLOBAL ':' vers_defns ';' LOCAL ':' vers_defns ';'
1066                 {
1067                   $$ = lang_new_vers_node ($3, $7);
1068                 }
1069         ;
1070
1071 vers_defns:
1072                 VERS_IDENTIFIER
1073                 {
1074                   $$ = lang_new_vers_regex (NULL, $1, ldgram_vers_current_lang);
1075                 }
1076         |       vers_defns ';' VERS_IDENTIFIER
1077                 {
1078                   $$ = lang_new_vers_regex ($1, $3, ldgram_vers_current_lang);
1079                 }
1080         |       EXTERN NAME '{'
1081                         {
1082                           $<name>$ = ldgram_vers_current_lang;
1083                           ldgram_vers_current_lang = $2;
1084                         }
1085                 vers_defns '}'
1086                         {
1087                           ldgram_vers_current_lang = $<name>4;
1088                         }
1089         ;
1090
1091 %%
1092 void
1093 yyerror(arg)
1094      const char *arg;
1095 {
1096   if (ldfile_assumed_script)
1097     einfo (_("%P:%s: file format not recognized; treating as linker script\n"),
1098            ldfile_input_filename);
1099   if (error_index > 0 && error_index < ERROR_NAME_MAX)
1100      einfo ("%P%F:%S: %s in %s\n", arg, error_names[error_index-1]);
1101   else
1102      einfo ("%P%F:%S: %s\n", arg);
1103 }