gas/dwarf2dbg.h

   1 /* dwarf2dbg.h - DWARF2 debug support
   2    Copyright (C) 1999-2017 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 AS_DWARF2DBG_H
  22 #define AS_DWARF2DBG_H
  23
  24 #include "as.h"
  25
  26 #define DWARF2_FLAG_IS_STMT             (1 << 0)
  27 #define DWARF2_FLAG_BASIC_BLOCK         (1 << 1)
  28 #define DWARF2_FLAG_PROLOGUE_END        (1 << 2)
  29 #define DWARF2_FLAG_EPILOGUE_BEGIN      (1 << 3)
  30
  31 struct dwarf2_line_info
  32 {
  33   unsigned int filenum;
  34   unsigned int line;
  35   unsigned int column;
  36   unsigned int isa;
  37   unsigned int flags;
  38   unsigned int discriminator;
  39   symbolS *view;
  40 };
  41
  42 /* Implements the .file FILENO "FILENAME" directive.  FILENO can be 0
  43    to indicate that no file number has been assigned.  All real file
  44    number must be >0.  */
  45 extern char *dwarf2_directive_file (int);
  46
  47 /* Implements the .loc FILENO LINENO [COLUMN] directive.  FILENO is
  48    the file number, LINENO the line number and the (optional) COLUMN
  49    the column of the source code that the following instruction
  50    corresponds to.  FILENO can be 0 to indicate that the filename
  51    specified by the textually most recent .file directive should be
  52    used.  */
  53 extern void dwarf2_directive_loc (int);
  54
  55 /* Implements the .loc_mark_labels {0,1} directive.  */
  56 extern void dwarf2_directive_loc_mark_labels (int);
  57
  58 /* Returns the current source information.  If .file directives have
  59    been encountered, the info for the corresponding source file is
  60    returned.  Otherwise, the info for the assembly source file is
  61    returned.  */
  62 extern void dwarf2_where (struct dwarf2_line_info *);
  63
  64 /* A hook to allow the target backend to inform the line number state
  65    machine of isa changes when assembler debug info is enabled.  */
  66 extern void dwarf2_set_isa (unsigned int);
  67
  68 /* This function generates .debug_line info based on the address and
  69    source information passed in the arguments.  ADDR should be the
  70    frag-relative offset of the instruction the information is for and
  71    L is the source information that should be associated with that
  72    address.  */
  73 extern void dwarf2_gen_line_info (addressT, struct dwarf2_line_info *);
  74
  75 /* Must be called for each generated instruction.  */
  76 extern void dwarf2_emit_insn (int);
  77
  78 void dwarf2_move_insn (int);
  79
  80 /* Reset the state of the line number information to reflect that
  81    it has been used.  */
  82 extern void dwarf2_consume_line_info (void);
  83
  84 /* Should be called for each code label.  */
  85 extern void dwarf2_emit_label (symbolS *);
  86
  87 /* True when we've seen a .loc directive recently.  Used to avoid
  88    doing work when there's nothing to do.  */
  89 extern bfd_boolean dwarf2_loc_directive_seen;
  90
  91 /* True when we're supposed to set the basic block mark whenever a label
  92    is seen.  Unless the target is doing Something Weird, just call
  93    dwarf2_emit_label.  */
  94 extern bfd_boolean dwarf2_loc_mark_labels;
  95
  96 extern void dwarf2_init (void);
  97
  98 extern void dwarf2_finish (void);
  99
 100 extern int dwarf2dbg_estimate_size_before_relax (fragS *);
 101 extern int dwarf2dbg_relax_frag (fragS *);
 102 extern void dwarf2dbg_convert_frag (fragS *);
 103
 104 extern void dwarf2dbg_final_check (void);
 105
 106 /* An enumeration which describes the sizes of offsets (to DWARF sections)
 107    and the mechanism by which the size is indicated.  */
 108 enum dwarf2_format
 109 {
 110   /* 32-bit format: the initial length field is 4 bytes long.  */
 111   dwarf2_format_32bit,
 112   /* DWARF3 64-bit format: the representation of the initial length
 113      (of a DWARF section) is 0xffffffff (4 bytes) followed by eight
 114      bytes indicating the actual length.  */
 115   dwarf2_format_64bit,
 116   /* SGI extension to DWARF2: The initial length is eight bytes.  */
 117   dwarf2_format_64bit_irix
 118 };
 119
 120 #endif /* AS_DWARF2DBG_H */