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  1. /* frags.h - Header file for the frag concept.
  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. #ifndef FRAGS_H
  22. #define FRAGS_H
  23.  
  24. struct obstack;
  25.  
  26. /* A code fragment (frag) is some known number of chars, followed by some
  27.    unknown number of chars. Typically the unknown number of chars is an
  28.    instruction address whose size is yet unknown. We always know the greatest
  29.    possible size the unknown number of chars may become, and reserve that
  30.    much room at the end of the frag.
  31.    Once created, frags do not change address during assembly.
  32.    We chain the frags in (a) forward-linked list(s). The object-file address
  33.    of the 1st char of a frag is generally not known until after relax().
  34.    Many things at assembly time describe an address by {object-file-address
  35.    of a particular frag}+offset.
  36.  
  37.    BUG: it may be smarter to have a single pointer off to various different
  38.    notes for different frag kinds.  See how code pans.  */
  39.  
  40. struct frag {
  41.   /* Object file address (as an octet offset).  */
  42.   addressT fr_address;
  43.   /* When relaxing multiple times, remember the address the frag had
  44.      in the last relax pass.  */
  45.   addressT last_fr_address;
  46.  
  47.   /* (Fixed) number of octets we know we have.  May be 0.  */
  48.   offsetT fr_fix;
  49.   /* May be used for (Variable) number of octets after above.
  50.      The generic frag handling code no longer makes any use of fr_var.  */
  51.   offsetT fr_var;
  52.   /* For variable-length tail.  */
  53.   offsetT fr_offset;
  54.   /* For variable-length tail.  */
  55.   symbolS *fr_symbol;
  56.   /* Points to opcode low addr byte, for relaxation.  */
  57.   char *fr_opcode;
  58.  
  59.   /* Chain forward; ascending address order.  Rooted in frch_root.  */
  60.   struct frag *fr_next;
  61.  
  62.   /* Where the frag was created, or where it became a variant frag.  */
  63.   char *fr_file;
  64.   unsigned int fr_line;
  65.  
  66. #ifndef NO_LISTING
  67.   struct list_info_struct *line;
  68. #endif
  69.  
  70.   /* A serial number for a sequence of frags having at most one alignment
  71.      or org frag, and that at the tail of the sequence.  */
  72.   unsigned int region:16;
  73.  
  74.   /* Flipped each relax pass so we can easily determine whether
  75.      fr_address has been adjusted.  */
  76.   unsigned int relax_marker:1;
  77.  
  78.   /* Used to ensure that all insns are emitted on proper address
  79.      boundaries.  */
  80.   unsigned int has_code:1;
  81.   unsigned int insn_addr:6;
  82.  
  83.   /* What state is my tail in? */
  84.   relax_stateT fr_type;
  85.   relax_substateT fr_subtype;
  86.  
  87. #ifdef USING_CGEN
  88.   /* Don't include this unless using CGEN to keep frag size down.  */
  89.   struct {
  90.     /* CGEN_INSN entry for this instruction.  */
  91.     const struct cgen_insn *insn;
  92.     /* Index into operand table.  */
  93.     int opindex;
  94.     /* Target specific data, usually reloc number.  */
  95.     int opinfo;
  96.   } fr_cgen;
  97. #endif
  98.  
  99. #ifdef TC_FRAG_TYPE
  100.   TC_FRAG_TYPE tc_frag_data;
  101. #endif
  102. #ifdef OBJ_FRAG_TYPE
  103.   OBJ_FRAG_TYPE obj_frag_data;
  104. #endif
  105.  
  106.   /* Data begins here.  */
  107.   char fr_literal[1];
  108. };
  109.  
  110. #define SIZEOF_STRUCT_FRAG \
  111. ((char *) zero_address_frag.fr_literal - (char *) &zero_address_frag)
  112. /* We want to say fr_literal[0] above.  */
  113.  
  114. /* Current frag we are building.  This frag is incomplete.  It is,
  115.    however, included in frchain_now.  The fr_fix field is bogus;
  116.    instead, use frag_now_fix ().  */
  117. COMMON fragS *frag_now;
  118. extern addressT frag_now_fix (void);
  119. extern addressT frag_now_fix_octets (void);
  120.  
  121. /* For foreign-segment symbol fixups.  */
  122. COMMON fragS zero_address_frag;
  123. COMMON fragS predefined_address_frag;
  124.  
  125. extern void frag_append_1_char (int);
  126. #define FRAG_APPEND_1_CHAR(X) frag_append_1_char (X)
  127.  
  128. void frag_init (void);
  129. fragS *frag_alloc (struct obstack *);
  130. void frag_grow (size_t nchars);
  131. char *frag_more (size_t nchars);
  132. void frag_align (int alignment, int fill_character, int max);
  133. void frag_align_pattern (int alignment, const char *fill_pattern,
  134.                          size_t n_fill, int max);
  135. void frag_align_code (int alignment, int max);
  136. void frag_new (size_t old_frags_var_max_size);
  137. void frag_wane (fragS * fragP);
  138. size_t frag_room (void);
  139.  
  140. char *frag_variant (relax_stateT type,
  141.                     size_t max_chars,
  142.                     size_t var,
  143.                     relax_substateT subtype,
  144.                     symbolS * symbol,
  145.                     offsetT offset,
  146.                     char *opcode);
  147.  
  148. char *frag_var (relax_stateT type,
  149.                 size_t max_chars,
  150.                 size_t var,
  151.                 relax_substateT subtype,
  152.                 symbolS * symbol,
  153.                 offsetT offset,
  154.                 char *opcode);
  155.  
  156. bfd_boolean frag_offset_fixed_p (const fragS *, const fragS *, offsetT *);
  157.  
  158. int get_frag_count (void);
  159. void clear_frag_count (void);
  160.  
  161. #endif /* FRAGS_H */
  162.