1 /* This module handles expression trees.
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 Free Software Foundation, Inc.
7 This file is part of GLD, the Gnu Linker.
9 GLD is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2, or (at your option)
14 GLD is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GLD; see the file COPYING. If not, write to the Free
21 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
24 /* This module is in charge of working out the contents of expressions.
26 It has to keep track of the relative/absness of a symbol etc. This
27 is done by keeping all values in a struct (an etree_value_type)
28 which contains a value, a section to which it is relative and a
41 #include "libiberty.h"
43 static void exp_print_token PARAMS ((token_code_type code));
44 static void make_abs PARAMS ((etree_value_type *ptr));
45 static etree_value_type new_abs PARAMS ((bfd_vma value));
46 static void check PARAMS ((lang_output_section_statement_type *os,
47 const char *name, const char *op));
48 static etree_value_type new_rel
49 PARAMS ((bfd_vma value, lang_output_section_statement_type *section));
50 static etree_value_type new_rel_from_section
51 PARAMS ((bfd_vma value, lang_output_section_statement_type *section));
52 static etree_value_type fold_binary
53 PARAMS ((etree_type *tree,
54 lang_output_section_statement_type *current_section,
55 lang_phase_type allocation_done,
56 bfd_vma dot, bfd_vma *dotp));
57 static etree_value_type fold_name
58 PARAMS ((etree_type *tree,
59 lang_output_section_statement_type *current_section,
60 lang_phase_type allocation_done,
62 static etree_value_type exp_fold_tree_no_dot
63 PARAMS ((etree_type *tree,
64 lang_output_section_statement_type *current_section,
65 lang_phase_type allocation_done));
68 exp_print_token (code)
103 { SECTIONS, "SECTIONS" },
104 { SIZEOF_HEADERS, "SIZEOF_HEADERS" },
105 { MEMORY, "MEMORY" },
106 { DEFINED, "DEFINED" },
107 { TARGET_K, "TARGET" },
108 { SEARCH_DIR, "SEARCH_DIR" },
112 { SIZEOF, "SIZEOF" },
114 { LOADADDR, "LOADADDR" },
116 { REL, "relocateable" },
120 for (idx = ARRAY_SIZE (table); idx--;)
122 if (table[idx].code == code)
124 fprintf (config.map_file, " %s ", table[idx].name);
129 /* Not in table, just print it alone. */
131 fprintf (config.map_file, " %c ", code);
133 fprintf (config.map_file, " <code %d> ", code);
138 etree_value_type *ptr;
140 asection *s = ptr->section->bfd_section;
141 ptr->value += s->vma;
142 ptr->section = abs_output_section;
145 static etree_value_type
149 etree_value_type new;
151 new.section = abs_output_section;
158 lang_output_section_statement_type *os;
163 einfo (_("%F%P: %s uses undefined section %s\n"), op, name);
165 einfo (_("%F%P: %s forward reference of section %s\n"), op, name);
172 etree_type *new = (etree_type *) stat_alloc (sizeof (new->value));
173 new->type.node_code = INT;
174 new->value.value = value;
175 new->type.node_class = etree_value;
180 /* Build an expression representing an unnamed relocateable value. */
183 exp_relop (section, value)
187 etree_type *new = (etree_type *) stat_alloc (sizeof (new->rel));
188 new->type.node_code = REL;
189 new->type.node_class = etree_rel;
190 new->rel.section = section;
191 new->rel.value = value;
195 static etree_value_type
196 new_rel (value, section)
198 lang_output_section_statement_type *section;
200 etree_value_type new;
203 new.section = section;
207 static etree_value_type
208 new_rel_from_section (value, section)
210 lang_output_section_statement_type *section;
212 etree_value_type new;
215 new.section = section;
217 new.value -= section->bfd_section->vma;
222 static etree_value_type
223 fold_binary (tree, current_section, allocation_done, dot, dotp)
225 lang_output_section_statement_type *current_section;
226 lang_phase_type allocation_done;
230 etree_value_type result;
232 result = exp_fold_tree (tree->binary.lhs, current_section,
233 allocation_done, dot, dotp);
236 etree_value_type other;
238 other = exp_fold_tree (tree->binary.rhs,
240 allocation_done, dot, dotp);
243 /* If the values are from different sections, or this is an
244 absolute expression, make both the source arguments
245 absolute. However, adding or subtracting an absolute
246 value from a relative value is meaningful, and is an
248 if (current_section != abs_output_section
249 && (other.section == abs_output_section
250 || (result.section == abs_output_section
251 && tree->type.node_code == '+'))
252 && (tree->type.node_code == '+'
253 || tree->type.node_code == '-'))
255 etree_value_type hold;
257 /* If there is only one absolute term, make sure it is the
259 if (other.section != abs_output_section)
266 else if (result.section != other.section
267 || current_section == abs_output_section)
273 switch (tree->type.node_code)
276 if (other.value == 0)
277 einfo (_("%F%S %% by zero\n"));
278 result.value = ((bfd_signed_vma) result.value
279 % (bfd_signed_vma) other.value);
283 if (other.value == 0)
284 einfo (_("%F%S / by zero\n"));
285 result.value = ((bfd_signed_vma) result.value
286 / (bfd_signed_vma) other.value);
289 #define BOP(x,y) case x : result.value = result.value y other.value; break;
308 if (result.value < other.value)
313 if (result.value > other.value)
323 result.valid_p = false;
333 etree_value_type new;
338 static etree_value_type
339 fold_name (tree, current_section, allocation_done, dot)
341 lang_output_section_statement_type *current_section;
342 lang_phase_type allocation_done;
345 etree_value_type result;
347 switch (tree->type.node_code)
350 if (allocation_done != lang_first_phase_enum)
352 result = new_abs ((bfd_vma)
353 bfd_sizeof_headers (output_bfd,
354 link_info.relocateable));
358 result.valid_p = false;
362 if (allocation_done == lang_first_phase_enum)
363 result.valid_p = false;
366 struct bfd_link_hash_entry *h;
368 h = bfd_wrapped_link_hash_lookup (output_bfd, &link_info,
371 result.value = (h != (struct bfd_link_hash_entry *) NULL
372 && (h->type == bfd_link_hash_defined
373 || h->type == bfd_link_hash_defweak
374 || h->type == bfd_link_hash_common));
376 result.valid_p = true;
380 result.valid_p = false;
381 if (tree->name.name[0] == '.' && tree->name.name[1] == 0)
383 if (allocation_done != lang_first_phase_enum)
384 result = new_rel_from_section (dot, current_section);
388 else if (allocation_done != lang_first_phase_enum)
390 struct bfd_link_hash_entry *h;
392 h = bfd_wrapped_link_hash_lookup (output_bfd, &link_info,
396 && (h->type == bfd_link_hash_defined
397 || h->type == bfd_link_hash_defweak))
399 if (bfd_is_abs_section (h->u.def.section))
400 result = new_abs (h->u.def.value);
401 else if (allocation_done == lang_final_phase_enum
402 || allocation_done == lang_allocating_phase_enum)
404 asection *output_section;
406 output_section = h->u.def.section->output_section;
407 if (output_section == NULL)
408 einfo (_("%X%S: unresolvable symbol `%s' referenced in expression\n"),
412 lang_output_section_statement_type *os;
414 os = (lang_output_section_statement_lookup
415 (bfd_get_section_name (output_bfd,
418 /* FIXME: Is this correct if this section is
419 being linked with -R? */
420 result = new_rel ((h->u.def.value
421 + h->u.def.section->output_offset),
426 else if (allocation_done == lang_final_phase_enum)
427 einfo (_("%F%S: undefined symbol `%s' referenced in expression\n"),
433 if (allocation_done != lang_first_phase_enum)
435 lang_output_section_statement_type *os;
437 os = lang_output_section_find (tree->name.name);
438 check (os, tree->name.name, "ADDR");
439 result = new_rel (0, os);
446 if (allocation_done != lang_first_phase_enum)
448 lang_output_section_statement_type *os;
450 os = lang_output_section_find (tree->name.name);
451 check (os, tree->name.name, "LOADADDR");
452 if (os->load_base == NULL)
453 result = new_rel (0, os);
455 result = exp_fold_tree_no_dot (os->load_base,
464 if (allocation_done != lang_first_phase_enum)
466 int opb = bfd_octets_per_byte (output_bfd);
467 lang_output_section_statement_type *os;
469 os = lang_output_section_find (tree->name.name);
470 check (os, tree->name.name, "SIZEOF");
471 result = new_abs (os->bfd_section->_raw_size / opb);
486 exp_fold_tree (tree, current_section, allocation_done, dot, dotp)
488 lang_output_section_statement_type *current_section;
489 lang_phase_type allocation_done;
493 etree_value_type result;
497 result.valid_p = false;
501 switch (tree->type.node_class)
504 result = new_rel (tree->value.value, current_section);
508 if (allocation_done != lang_final_phase_enum)
509 result.valid_p = false;
511 result = new_rel ((tree->rel.value
512 + tree->rel.section->output_section->vma
513 + tree->rel.section->output_offset),
518 result = exp_fold_tree (tree->assert_s.child,
520 allocation_done, dot, dotp);
524 einfo ("%F%P: %s\n", tree->assert_s.message);
530 result = exp_fold_tree (tree->unary.child,
532 allocation_done, dot, dotp);
535 switch (tree->type.node_code)
538 if (allocation_done != lang_first_phase_enum)
539 result = new_rel_from_section (ALIGN_N (dot, result.value),
542 result.valid_p = false;
546 if (allocation_done != lang_first_phase_enum && result.valid_p)
548 result.value += result.section->bfd_section->vma;
549 result.section = abs_output_section;
552 result.valid_p = false;
557 result.value = ~result.value;
562 result.value = !result.value;
567 result.value = -result.value;
571 /* Return next place aligned to value. */
572 if (allocation_done == lang_allocating_phase_enum)
575 result.value = ALIGN_N (dot, result.value);
578 result.valid_p = false;
589 result = exp_fold_tree (tree->trinary.cond, current_section,
590 allocation_done, dot, dotp);
592 result = exp_fold_tree ((result.value
594 : tree->trinary.rhs),
596 allocation_done, dot, dotp);
600 result = fold_binary (tree, current_section, allocation_done,
607 if (tree->assign.dst[0] == '.' && tree->assign.dst[1] == 0)
609 /* Assignment to dot can only be done during allocation. */
610 if (tree->type.node_class != etree_assign)
611 einfo (_("%F%S can not PROVIDE assignment to location counter\n"));
612 if (allocation_done == lang_allocating_phase_enum
613 || (allocation_done == lang_final_phase_enum
614 && current_section == abs_output_section))
616 result = exp_fold_tree (tree->assign.src,
618 lang_allocating_phase_enum, dot,
620 if (! result.valid_p)
621 einfo (_("%F%S invalid assignment to location counter\n"));
624 if (current_section == NULL)
625 einfo (_("%F%S assignment to location counter invalid outside of SECTION\n"));
630 nextdot = (result.value
631 + current_section->bfd_section->vma);
633 && current_section != abs_output_section)
634 einfo (_("%F%S cannot move location counter backwards (from %V to %V)\n"),
644 result = exp_fold_tree (tree->assign.src,
645 current_section, allocation_done,
650 struct bfd_link_hash_entry *h;
652 if (tree->type.node_class == etree_assign)
656 h = bfd_link_hash_lookup (link_info.hash, tree->assign.dst,
657 create, false, false);
658 if (h == (struct bfd_link_hash_entry *) NULL)
660 if (tree->type.node_class == etree_assign)
661 einfo (_("%P%F:%s: hash creation failed\n"),
664 else if (tree->type.node_class == etree_provide
665 && h->type != bfd_link_hash_undefined
666 && h->type != bfd_link_hash_common)
668 /* Do nothing. The symbol was defined by some
673 /* FIXME: Should we worry if the symbol is already
675 h->type = bfd_link_hash_defined;
676 h->u.def.value = result.value;
677 h->u.def.section = result.section->bfd_section;
678 if (tree->type.node_class == etree_provide)
679 tree->type.node_class = etree_provided;
686 result = fold_name (tree, current_section, allocation_done, dot);
697 static etree_value_type
698 exp_fold_tree_no_dot (tree, current_section, allocation_done)
700 lang_output_section_statement_type *current_section;
701 lang_phase_type allocation_done;
703 return exp_fold_tree (tree, current_section, allocation_done,
704 (bfd_vma) 0, (bfd_vma *) NULL);
708 exp_binop (code, lhs, rhs)
713 etree_type value, *new;
716 value.type.node_code = code;
717 value.binary.lhs = lhs;
718 value.binary.rhs = rhs;
719 value.type.node_class = etree_binary;
720 r = exp_fold_tree_no_dot (&value,
722 lang_first_phase_enum);
725 return exp_intop (r.value);
727 new = (etree_type *) stat_alloc (sizeof (new->binary));
728 memcpy ((char *) new, (char *) &value, sizeof (new->binary));
733 exp_trinop (code, cond, lhs, rhs)
739 etree_type value, *new;
741 value.type.node_code = code;
742 value.trinary.lhs = lhs;
743 value.trinary.cond = cond;
744 value.trinary.rhs = rhs;
745 value.type.node_class = etree_trinary;
746 r = exp_fold_tree_no_dot (&value,
747 (lang_output_section_statement_type *) NULL,
748 lang_first_phase_enum);
750 return exp_intop (r.value);
752 new = (etree_type *) stat_alloc (sizeof (new->trinary));
753 memcpy ((char *) new, (char *) &value, sizeof (new->trinary));
758 exp_unop (code, child)
762 etree_type value, *new;
765 value.unary.type.node_code = code;
766 value.unary.child = child;
767 value.unary.type.node_class = etree_unary;
768 r = exp_fold_tree_no_dot (&value, abs_output_section,
769 lang_first_phase_enum);
771 return exp_intop (r.value);
773 new = (etree_type *) stat_alloc (sizeof (new->unary));
774 memcpy ((char *) new, (char *) &value, sizeof (new->unary));
779 exp_nameop (code, name)
783 etree_type value, *new;
785 value.name.type.node_code = code;
786 value.name.name = name;
787 value.name.type.node_class = etree_name;
789 r = exp_fold_tree_no_dot (&value,
790 (lang_output_section_statement_type *) NULL,
791 lang_first_phase_enum);
793 return exp_intop (r.value);
795 new = (etree_type *) stat_alloc (sizeof (new->name));
796 memcpy ((char *) new, (char *) &value, sizeof (new->name));
802 exp_assop (code, dst, src)
807 etree_type value, *new;
809 value.assign.type.node_code = code;
811 value.assign.src = src;
812 value.assign.dst = dst;
813 value.assign.type.node_class = etree_assign;
816 if (exp_fold_tree_no_dot (&value, &result))
817 return exp_intop (result);
819 new = (etree_type *) stat_alloc (sizeof (new->assign));
820 memcpy ((char *) new, (char *) &value, sizeof (new->assign));
824 /* Handle PROVIDE. */
827 exp_provide (dst, src)
833 n = (etree_type *) stat_alloc (sizeof (n->assign));
834 n->assign.type.node_code = '=';
835 n->assign.type.node_class = etree_provide;
844 exp_assert (exp, message)
850 n = (etree_type *) stat_alloc (sizeof (n->assert_s));
851 n->assert_s.type.node_code = '!';
852 n->assert_s.type.node_class = etree_assert;
853 n->assert_s.child = exp;
854 n->assert_s.message = message;
859 exp_print_tree (tree)
862 if (config.map_file == NULL)
863 config.map_file = stderr;
867 minfo ("NULL TREE\n");
871 switch (tree->type.node_class)
874 minfo ("0x%v", tree->value.value);
877 if (tree->rel.section->owner != NULL)
878 minfo ("%B:", tree->rel.section->owner);
879 minfo ("%s+0x%v", tree->rel.section->name, tree->rel.value);
883 if (tree->assign.dst->sdefs != (asymbol *) NULL)
884 fprintf (config.map_file, "%s (%x) ", tree->assign.dst->name,
885 tree->assign.dst->sdefs->value);
887 fprintf (config.map_file, "%s (UNDEFINED)", tree->assign.dst->name);
889 fprintf (config.map_file, "%s", tree->assign.dst);
890 exp_print_token (tree->type.node_code);
891 exp_print_tree (tree->assign.src);
895 fprintf (config.map_file, "PROVIDE (%s, ", tree->assign.dst);
896 exp_print_tree (tree->assign.src);
897 fprintf (config.map_file, ")");
900 fprintf (config.map_file, "(");
901 exp_print_tree (tree->binary.lhs);
902 exp_print_token (tree->type.node_code);
903 exp_print_tree (tree->binary.rhs);
904 fprintf (config.map_file, ")");
907 exp_print_tree (tree->trinary.cond);
908 fprintf (config.map_file, "?");
909 exp_print_tree (tree->trinary.lhs);
910 fprintf (config.map_file, ":");
911 exp_print_tree (tree->trinary.rhs);
914 exp_print_token (tree->unary.type.node_code);
915 if (tree->unary.child)
917 fprintf (config.map_file, "(");
918 exp_print_tree (tree->unary.child);
919 fprintf (config.map_file, ")");
924 fprintf (config.map_file, "ASSERT (");
925 exp_print_tree (tree->assert_s.child);
926 fprintf (config.map_file, ", %s)", tree->assert_s.message);
930 fprintf (config.map_file, "????????");
933 if (tree->type.node_code == NAME)
935 fprintf (config.map_file, "%s", tree->name.name);
939 exp_print_token (tree->type.node_code);
941 fprintf (config.map_file, "(%s)", tree->name.name);
951 exp_get_vma (tree, def, name, allocation_done)
955 lang_phase_type allocation_done;
961 r = exp_fold_tree_no_dot (tree, abs_output_section, allocation_done);
962 if (! r.valid_p && name != NULL)
963 einfo (_("%F%S nonconstant expression for %s\n"), name);
971 exp_get_value_int (tree, def, name, allocation_done)
975 lang_phase_type allocation_done;
977 return (int) exp_get_vma (tree, (bfd_vma) def, name, allocation_done);
981 exp_get_abs_int (tree, def, name, allocation_done)
983 int def ATTRIBUTE_UNUSED;
985 lang_phase_type allocation_done;
987 etree_value_type res;
988 res = exp_fold_tree_no_dot (tree, abs_output_section, allocation_done);
991 res.value += res.section->bfd_section->vma;
993 einfo (_("%F%S non constant expression for %s\n"), name);