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[/] [scarts/] [trunk/] [toolchain/] [scarts-binutils/] [binutils-2.19.1/] [gas/] [subsegs.h] - Blame information for rev 6

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1 6 jlechner
/* subsegs.h -> subsegs.c
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   Copyright 1987, 1992, 1993, 1994, 1995, 1996, 1998, 2000, 2003, 2005,
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   2006, 2007 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 3, 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 the Free
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   Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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   02110-1301, 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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#include "obstack.h"
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struct frch_cfi_data;
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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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  subsegT frch_subseg;          /* subsegment number of this chain */
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  fixS *fix_root;               /* Root of fixups for this subsegment.  */
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  fixS *fix_tail;               /* Last fixup for this subsegment.  */
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  struct obstack frch_obstack;  /* for objects in this frag chain */
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  fragS *frch_frag_now;         /* frag_now for this subsegment */
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  struct frch_cfi_data *frch_cfi_data;
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};
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typedef struct frchain frchainS;
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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 segment_info_struct {
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  frchainS *frchainP;
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  unsigned 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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  unsigned int bss : 1;
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  int user_stuff;
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  /* Fixups for this segment.  This is only valid after the frchains
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     are run together.  */
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  fixS *fix_root;
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  fixS *fix_tail;
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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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  /* 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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  union {
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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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#ifdef TC_SEGMENT_INFO_TYPE
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  TC_SEGMENT_INFO_TYPE tc_segment_info_data;
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#endif
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} segment_info_type;
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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 (segT);
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extern void subsegs_print_statistics (FILE *);

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