* emulparams/hppa64linux.sh: Define PLT_BEFORE_GOT.
[binutils.git] / gas / subsegs.h
blob331c55709f5dde3604f29d3ad472c4b5a985590b
1 /* subsegs.h -> subsegs.c
2 Copyright 1987, 1992, 1993, 1994, 1995, 1996, 1998, 2000
3 Free Software Foundation, Inc.
5 This file is part of GAS, the GNU Assembler.
7 GAS 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 2, or (at your option)
10 any later version.
12 GAS 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.
17 You should have received a copy of the GNU General Public License
18 along with GAS; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
20 02111-1307, USA. */
23 * For every sub-segment the user mentions in the ASsembler program,
24 * we make one struct frchain. Each sub-segment has exactly one struct frchain
25 * and vice versa.
27 * Struct frchain's are forward chained (in ascending order of sub-segment
28 * code number). The chain runs through frch_next of each subsegment.
29 * This makes it hard to find a subsegment's frags
30 * if programmer uses a lot of them. Most programs only use text0 and
31 * data0, so they don't suffer. At least this way:
32 * (1) There are no "arbitrary" restrictions on how many subsegments
33 * can be programmed;
34 * (2) Subsegments' frchain-s are (later) chained together in the order in
35 * which they are emitted for object file viz text then data.
37 * From each struct frchain dangles a chain of struct frags. The frags
38 * represent code fragments, for that sub-segment, forward chained.
41 #include "obstack.h"
43 struct frchain /* control building of a frag chain */
44 { /* FRCH = FRagment CHain control */
45 struct frag *frch_root; /* 1st struct frag in chain, or NULL */
46 struct frag *frch_last; /* last struct frag in chain, or NULL */
47 struct frchain *frch_next; /* next in chain of struct frchain-s */
48 segT frch_seg; /* SEG_TEXT or SEG_DATA. */
49 subsegT frch_subseg; /* subsegment number of this chain */
50 #ifdef BFD_ASSEMBLER
51 fixS *fix_root; /* Root of fixups for this subsegment. */
52 fixS *fix_tail; /* Last fixup for this subsegment. */
53 #endif
54 struct obstack frch_obstack; /* for objects in this frag chain */
55 fragS *frch_frag_now; /* frag_now for this subsegment */
58 typedef struct frchain frchainS;
60 /* All subsegments' chains hang off here. NULL means no frchains yet. */
61 extern frchainS *frchain_root;
63 /* Frchain we are assembling into now. That is, the current segment's
64 frag chain, even if it contains no (complete) frags. */
65 extern frchainS *frchain_now;
67 typedef struct segment_info_struct {
68 frchainS *frchainP;
69 unsigned int hadone : 1;
71 /* This field is set if this is a .bss section which does not really
72 have any contents. Once upon a time a .bss section did not have
73 any frags, but that is no longer true. This field prevent the
74 SEC_HAS_CONTENTS flag from being set for the section even if
75 there are frags. */
76 unsigned int bss : 1;
78 int user_stuff;
80 /* Fixups for this segment. If BFD_ASSEMBLER, this is only valid
81 after the frchains are run together. */
82 fixS *fix_root;
83 fixS *fix_tail;
85 #if defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
86 struct internal_scnhdr scnhdr;
87 enum linkonce_type linkonce;
88 const char *name;
89 #endif
91 symbolS *dot;
93 struct lineno_list *lineno_list_head;
94 struct lineno_list *lineno_list_tail;
96 #ifdef BFD_ASSEMBLER
97 /* Which BFD section does this gas segment correspond to? */
98 asection *bfd_section;
100 /* NULL, or pointer to the gas symbol that is the section symbol for
101 this section. sym->bsym and bfd_section->symbol should be the same. */
102 symbolS *sym;
103 #endif
105 union {
106 /* Current size of section holding stabs strings. */
107 unsigned long stab_string_size;
108 /* Initial frag for ELF. */
109 char *p;
111 stabu;
113 #ifdef NEED_LITERAL_POOL
114 unsigned long literal_pool_size;
115 #endif
117 #ifdef TC_SEGMENT_INFO_TYPE
118 TC_SEGMENT_INFO_TYPE tc_segment_info_data;
119 #endif
120 } segment_info_type;
122 #ifdef BFD_ASSEMBLER
124 extern segment_info_type *seg_info (segT);
125 extern symbolS *section_symbol (segT);
127 #else /* ! BFD_ASSEMBLER */
129 #ifdef MANY_SEGMENTS
131 extern segment_info_type segment_info[];
133 #define seg_info(SEC) (&segment_info[SEC])
135 #else
137 /* Sentinel for frchain crawling. Points to the 1st data-segment
138 frchain. (Which is pointed to by the last text-segment frchain.) */
139 extern frchainS *data0_frchainP;
140 extern frchainS *bss0_frchainP;
142 /* Dummy so stuff can compile. Should never be used. */
143 struct seg_info_trash {
144 struct {
145 unsigned stab_string_size : 1;
146 } stabu;
147 unsigned hadone : 1;
149 #define seg_info(S) (abort (), (struct seg_info_trash *) 0)
151 #endif
153 #endif /* ! BFD_ASSEMBLER */
155 extern void subsegs_print_statistics (FILE *);