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131 lines
4.0 KiB
C
131 lines
4.0 KiB
C
/* subsegs.h -> subsegs.c
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Copyright (C) 1987, 1992 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/*
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* For every sub-segment the user mentions in the ASsembler program,
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* we make one struct frchain. Each sub-segment has exactly one struct frchain
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* and vice versa.
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*
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* Struct frchain's are forward chained (in ascending order of sub-segment
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* code number). The chain runs through frch_next of each subsegment.
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* This makes it hard to find a subsegment's frags
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* if programmer uses a lot of them. Most programs only use text0 and
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* data0, so they don't suffer. At least this way:
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* (1) There are no "arbitrary" restrictions on how many subsegments
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* can be programmed;
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* (2) Subsegments' frchain-s are (later) chained together in the order in
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* which they are emitted for object file viz text then data.
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*
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* From each struct frchain dangles a chain of struct frags. The frags
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* represent code fragments, for that sub-segment, forward chained.
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*/
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struct frchain /* control building of a frag chain */
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{ /* FRCH = FRagment CHain control */
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struct frag *frch_root; /* 1st struct frag in chain, or NULL */
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struct frag *frch_last; /* last struct frag in chain, or NULL */
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struct frchain *frch_next; /* next in chain of struct frchain-s */
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segT frch_seg; /* SEG_TEXT or SEG_DATA. */
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subsegT frch_subseg; /* subsegment number of this chain */
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};
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typedef struct frchain frchainS;
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/* All subsegments' chains hang off here. NULL means no frchains yet. */
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extern frchainS *frchain_root;
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/* Frchain we are assembling into now That is, the current segment's
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frag chain, even if it contains no (complete) frags. */
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extern frchainS *frchain_now;
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typedef struct
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{
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frchainS *frchainP;
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int hadone : 1;
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/* This field is set if this is a .bss section which does not really
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have any contents. Once upon a time a .bss section did not have
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any frags, but that is no longer true. This field prevent the
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SEC_HAS_CONTENTS flag from being set for the section even if
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there are frags. */
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int bss : 1;
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int user_stuff;
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fixS *fix_root;
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fixS *fix_tail;
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#if defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
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struct internal_scnhdr scnhdr;
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#endif
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symbolS *dot;
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struct lineno_list *lineno_list_head;
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struct lineno_list *lineno_list_tail;
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#ifdef BFD_ASSEMBLER
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/* Which BFD section does this gas segment correspond to? */
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asection *bfd_section;
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/* NULL, or pointer to the gas symbol that is the section symbol for
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this section. sym->bsym and bfd_section->symbol should be the same. */
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symbolS *sym;
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#endif
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union
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{
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/* Current size of section holding stabs strings. */
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unsigned long stab_string_size;
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/* Initial frag for ELF. */
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char *p;
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}
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stabu;
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#ifdef NEED_LITERAL_POOL
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unsigned long literal_pool_size;
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#endif
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} segment_info_type;
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#ifdef BFD_ASSEMBLER
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#define seg_info(SEC) \
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((segment_info_type *) bfd_get_section_userdata (stdoutput, (SEC)))
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extern symbolS *section_symbol PARAMS ((segT));
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#else /* ! BFD_ASSEMBLER */
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#ifdef MANY_SEGMENTS
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extern segment_info_type segment_info[];
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#define seg_info(SEC) (&segment_info[SEC])
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#else
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/* Sentinel for frchain crawling. Points to the 1st data-segment
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frchain. (Which is pointed to by the last text-segment frchain.) */
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extern frchainS *data0_frchainP;
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extern frchainS *bss0_frchainP;
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#endif
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#endif /* ! BFD_ASSEMBLER */
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/* end of subsegs.h */
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