118 lines
4.0 KiB
C
118 lines
4.0 KiB
C
/* subsegs.h -> subsegs.c
|
|
Copyright 1987, 1992, 1993, 1994, 1995, 1996, 1998, 2000, 2003, 2005,
|
|
2006, 2007, 2009 Free Software Foundation, Inc.
|
|
|
|
This file is part of GAS, the GNU Assembler.
|
|
|
|
GAS is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3, or (at your option)
|
|
any later version.
|
|
|
|
GAS is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GAS; see the file COPYING. If not, write to the Free
|
|
Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
|
|
02110-1301, USA. */
|
|
|
|
/*
|
|
* For every sub-segment the user mentions in the ASsembler program,
|
|
* we make one struct frchain. Each sub-segment has exactly one struct frchain
|
|
* and vice versa.
|
|
*
|
|
* Struct frchain's are forward chained (in ascending order of sub-segment
|
|
* code number). The chain runs through frch_next of each subsegment.
|
|
* This makes it hard to find a subsegment's frags
|
|
* if programmer uses a lot of them. Most programs only use text0 and
|
|
* data0, so they don't suffer. At least this way:
|
|
* (1) There are no "arbitrary" restrictions on how many subsegments
|
|
* can be programmed;
|
|
* (2) Subsegments' frchain-s are (later) chained together in the order in
|
|
* which they are emitted for object file viz text then data.
|
|
*
|
|
* From each struct frchain dangles a chain of struct frags. The frags
|
|
* represent code fragments, for that sub-segment, forward chained.
|
|
*/
|
|
|
|
#include "obstack.h"
|
|
|
|
struct frch_cfi_data;
|
|
|
|
struct frchain /* control building of a frag chain */
|
|
{ /* FRCH = FRagment CHain control */
|
|
struct frag *frch_root; /* 1st struct frag in chain, or NULL */
|
|
struct frag *frch_last; /* last struct frag in chain, or NULL */
|
|
struct frchain *frch_next; /* next in chain of struct frchain-s */
|
|
subsegT frch_subseg; /* subsegment number of this chain */
|
|
fixS *fix_root; /* Root of fixups for this subsegment. */
|
|
fixS *fix_tail; /* Last fixup for this subsegment. */
|
|
struct obstack frch_obstack; /* for objects in this frag chain */
|
|
fragS *frch_frag_now; /* frag_now for this subsegment */
|
|
struct frch_cfi_data *frch_cfi_data;
|
|
};
|
|
|
|
typedef struct frchain frchainS;
|
|
|
|
/* Frchain we are assembling into now. That is, the current segment's
|
|
frag chain, even if it contains no (complete) frags. */
|
|
extern frchainS *frchain_now;
|
|
|
|
typedef struct segment_info_struct {
|
|
frchainS *frchainP;
|
|
unsigned int hadone : 1;
|
|
|
|
/* This field is set if this is a .bss section which does not really
|
|
have any contents. Once upon a time a .bss section did not have
|
|
any frags, but that is no longer true. This field prevent the
|
|
SEC_HAS_CONTENTS flag from being set for the section even if
|
|
there are frags. */
|
|
unsigned int bss : 1;
|
|
|
|
int user_stuff;
|
|
|
|
/* Fixups for this segment. This is only valid after the frchains
|
|
are run together. */
|
|
fixS *fix_root;
|
|
fixS *fix_tail;
|
|
|
|
symbolS *dot;
|
|
|
|
struct lineno_list *lineno_list_head;
|
|
struct lineno_list *lineno_list_tail;
|
|
|
|
/* Which BFD section does this gas segment correspond to? */
|
|
asection *bfd_section;
|
|
|
|
/* NULL, or pointer to the gas symbol that is the section symbol for
|
|
this section. sym->bsym and bfd_section->symbol should be the same. */
|
|
symbolS *sym;
|
|
|
|
union {
|
|
/* Current size of section holding stabs strings. */
|
|
unsigned long stab_string_size;
|
|
/* Initial frag for ELF. */
|
|
char *p;
|
|
}
|
|
stabu;
|
|
|
|
#ifdef NEED_LITERAL_POOL
|
|
unsigned long literal_pool_size;
|
|
#endif
|
|
|
|
#ifdef TC_SEGMENT_INFO_TYPE
|
|
TC_SEGMENT_INFO_TYPE tc_segment_info_data;
|
|
#endif
|
|
} segment_info_type;
|
|
|
|
|
|
#define seg_info(sec) \
|
|
((segment_info_type *) bfd_get_section_userdata (stdoutput, sec))
|
|
|
|
extern symbolS *section_symbol (segT);
|
|
|
|
extern void subsegs_print_statistics (FILE *);
|