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  1. /* subsegs.h -> subsegs.c
  2.    Copyright (C) 1987-2015 Free Software Foundation, Inc.
  3.  
  4.    This file is part of GAS, the GNU Assembler.
  5.  
  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.
  10.  
  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.
  15.  
  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.  */
  20.  
  21. /*
  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.
  25.  *
  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.
  35.  *
  36.  * From each struct frchain dangles a chain of struct frags. The frags
  37.  * represent code fragments, for that sub-segment, forward chained.
  38.  */
  39.  
  40. #include "obstack.h"
  41.  
  42. struct frch_cfi_data;
  43.  
  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;
  55. };
  56.  
  57. typedef struct frchain frchainS;
  58.  
  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;
  62.  
  63. typedef struct segment_info_struct {
  64.   frchainS *frchainP;
  65.   unsigned int hadone : 1;
  66.  
  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;
  73.  
  74.   int user_stuff;
  75.  
  76.   /* Fixups for this segment.  This is only valid after the frchains
  77.      are run together.  */
  78.   fixS *fix_root;
  79.   fixS *fix_tail;
  80.  
  81.   symbolS *dot;
  82.  
  83.   struct lineno_list *lineno_list_head;
  84.   struct lineno_list *lineno_list_tail;
  85.  
  86.   /* Which BFD section does this gas segment correspond to?  */
  87.   asection *bfd_section;
  88.  
  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;
  92.  
  93.   /* Used by dwarf2dbg.c for this section's line table entries.  */
  94.   void *dwarf2_line_seg;
  95.  
  96.   union {
  97.     /* Current size of section holding stabs strings.  */
  98.     unsigned long stab_string_size;
  99.     /* Initial frag for ELF.  */
  100.     char *p;
  101.   }
  102.   stabu;
  103.  
  104. #ifdef NEED_LITERAL_POOL
  105.   unsigned long literal_pool_size;
  106. #endif
  107.  
  108. #ifdef TC_SEGMENT_INFO_TYPE
  109.   TC_SEGMENT_INFO_TYPE tc_segment_info_data;
  110. #endif
  111. } segment_info_type;
  112.  
  113.  
  114. #define seg_info(sec) \
  115.   ((segment_info_type *) bfd_get_section_userdata (stdoutput, sec))
  116.  
  117. extern symbolS *section_symbol (segT);
  118.  
  119. extern void subsegs_print_statistics (FILE *);
  120.