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[binutils-gdb.git] / gas / subsegs.h
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1 /* subsegs.h -> subsegs.c
2 Copyright (C) 1987-2022 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option)
9 any later version.
11 GAS is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GAS; see the file COPYING. If not, write to the Free
18 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
19 02110-1301, USA. */
22 * For every sub-segment the user mentions in the ASsembler program,
23 * we make one struct frchain. Each sub-segment has exactly one struct frchain
24 * and vice versa.
26 * Struct frchain's are forward chained (in ascending order of sub-segment
27 * code number). The chain runs through frch_next of each subsegment.
28 * This makes it hard to find a subsegment's frags
29 * if programmer uses a lot of them. Most programs only use text0 and
30 * data0, so they don't suffer. At least this way:
31 * (1) There are no "arbitrary" restrictions on how many subsegments
32 * can be programmed;
33 * (2) Subsegments' frchain-s are (later) chained together in the order in
34 * which they are emitted for object file viz text then data.
36 * From each struct frchain dangles a chain of struct frags. The frags
37 * represent code fragments, for that sub-segment, forward chained.
40 #include "obstack.h"
42 struct frch_cfi_data;
44 struct frchain /* control building of a frag chain */
45 { /* FRCH = FRagment CHain control */
46 struct frag *frch_root; /* 1st struct frag in chain, or NULL */
47 struct frag *frch_last; /* last struct frag in chain, or NULL */
48 struct frchain *frch_next; /* next in chain of struct frchain-s */
49 subsegT frch_subseg; /* subsegment number of this chain */
50 fixS *fix_root; /* Root of fixups for this subsegment. */
51 fixS *fix_tail; /* Last fixup for this subsegment. */
52 struct obstack frch_obstack; /* for objects in this frag chain */
53 fragS *frch_frag_now; /* frag_now for this subsegment */
54 struct frch_cfi_data *frch_cfi_data;
57 typedef struct frchain frchainS;
59 /* Frchain we are assembling into now. That is, the current segment's
60 frag chain, even if it contains no (complete) frags. */
61 extern frchainS *frchain_now;
63 typedef struct segment_info_struct {
64 frchainS *frchainP;
65 unsigned int hadone : 1;
67 /* This field is set if this is a .bss section which does not really
68 have any contents. Once upon a time a .bss section did not have
69 any frags, but that is no longer true. This field prevent the
70 SEC_HAS_CONTENTS flag from being set for the section even if
71 there are frags. */
72 unsigned int bss : 1;
74 int user_stuff;
76 /* Fixups for this segment. This is only valid after the frchains
77 are run together. */
78 fixS *fix_root;
79 fixS *fix_tail;
81 symbolS *dot;
83 struct lineno_list *lineno_list_head;
84 struct lineno_list *lineno_list_tail;
86 /* Which BFD section does this gas segment correspond to? */
87 asection *bfd_section;
89 /* NULL, or pointer to the gas symbol that is the section symbol for
90 this section. sym->bsym and bfd_section->symbol should be the same. */
91 symbolS *sym;
93 /* Used by dwarf2dbg.c for this section's line table entries. */
94 void *dwarf2_line_seg;
96 union {
97 /* Current size of section holding stabs strings. */
98 unsigned long stab_string_size;
99 /* Initial frag for ELF. */
100 char *p;
102 stabu;
104 #ifdef NEED_LITERAL_POOL
105 unsigned long literal_pool_size;
106 #endif
108 #ifdef TC_SEGMENT_INFO_TYPE
109 TC_SEGMENT_INFO_TYPE tc_segment_info_data;
110 #endif
111 } segment_info_type;
114 #define seg_info(sec) \
115 ((segment_info_type *) bfd_section_userdata (sec))
117 extern symbolS *section_symbol (segT);
119 extern void subsegs_print_statistics (FILE *);