binutils/dwarf.h

   1 /* dwarf.h - DWARF support header file
   2    Copyright (C) 2005-2022 Free Software Foundation, Inc.
   3
   4    This file is part of GNU Binutils.
   5
   6    This program 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 of the License, or
   9    (at your option) any later version.
  10
  11    This program 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 this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 #include "dwarf2.h" /* for enum dwarf_unit_type */
  22
  23 typedef unsigned HOST_WIDEST_INT  dwarf_vma;
  24 typedef HOST_WIDEST_INT           dwarf_signed_vma;
  25 typedef unsigned HOST_WIDEST_INT  dwarf_size_type;
  26
  27 /* Structure found in the .debug_line section.  */
  28 typedef struct
  29 {
  30   dwarf_vma      li_length;
  31   unsigned short li_version;
  32   unsigned char  li_address_size;
  33   unsigned char  li_segment_size;
  34   dwarf_vma      li_prologue_length;
  35   unsigned char  li_min_insn_length;
  36   unsigned char  li_max_ops_per_insn;
  37   unsigned char  li_default_is_stmt;
  38   int            li_line_base;
  39   unsigned char  li_line_range;
  40   unsigned char  li_opcode_base;
  41   unsigned int   li_offset_size;
  42 }
  43 DWARF2_Internal_LineInfo;
  44
  45 /* Structure found in .debug_pubnames section.  */
  46 typedef struct
  47 {
  48   dwarf_vma      pn_length;
  49   unsigned short pn_version;
  50   dwarf_vma      pn_offset;
  51   dwarf_vma      pn_size;
  52 }
  53 DWARF2_Internal_PubNames;
  54
  55 /* Structure found in .debug_info section.  */
  56 typedef struct
  57 {
  58   dwarf_vma      cu_length;
  59   unsigned short cu_version;
  60   dwarf_vma      cu_abbrev_offset;
  61   unsigned char  cu_pointer_size;
  62   enum dwarf_unit_type cu_unit_type;
  63 }
  64 DWARF2_Internal_CompUnit;
  65
  66 /* Structure found in .debug_aranges section.  */
  67 typedef struct
  68 {
  69   dwarf_vma      ar_length;
  70   unsigned short ar_version;
  71   dwarf_vma      ar_info_offset;
  72   unsigned char  ar_pointer_size;
  73   unsigned char  ar_segment_size;
  74 }
  75 DWARF2_Internal_ARange;
  76
  77 /* N.B. The order here must match the order in debug_displays.  */
  78
  79 enum dwarf_section_display_enum
  80 {
  81   abbrev = 0,
  82   aranges,
  83   frame,
  84   info,
  85   line,
  86   pubnames,
  87   gnu_pubnames,
  88   eh_frame,
  89   macinfo,
  90   macro,
  91   str,
  92   line_str,
  93   loc,
  94   loclists,
  95   pubtypes,
  96   gnu_pubtypes,
  97   ranges,
  98   rnglists,
  99   static_func,
 100   static_vars,
 101   types,
 102   weaknames,
 103   gdb_index,
 104   debug_names,
 105   trace_info,
 106   trace_abbrev,
 107   trace_aranges,
 108   info_dwo,
 109   abbrev_dwo,
 110   types_dwo,
 111   line_dwo,
 112   loc_dwo,
 113   macro_dwo,
 114   macinfo_dwo,
 115   str_dwo,
 116   str_index,
 117   str_index_dwo,
 118   debug_addr,
 119   dwp_cu_index,
 120   dwp_tu_index,
 121   gnu_debuglink,
 122   gnu_debugaltlink,
 123   debug_sup,
 124   separate_debug_str,
 125   note_gnu_build_id,
 126   max
 127 };
 128
 129 struct dwarf_section
 130 {
 131   /* A debug section has a different name when it's stored compressed
 132      or not.  XCOFF DWARF section also have a special name.
 133      COMPRESSED_NAME, UNCOMPRESSED_NAME and XCOFF_NAME are the three
 134      possibilities.  NAME is set to whichever one is used for this
 135      input file, as determined by load_debug_section().  */
 136   const char *                     uncompressed_name;
 137   const char *                     compressed_name;
 138   const char *                     xcoff_name;
 139   const char *                     name;
 140   /* If non-NULL then FILENAME is the name of the separate debug info
 141      file containing the section.  */
 142   const char *                     filename;
 143   unsigned char *                  start;
 144   dwarf_vma                        address;
 145   dwarf_size_type                  size;
 146   enum dwarf_section_display_enum  abbrev_sec;
 147   /* Used by clients to help them implement the reloc_at callback.  */
 148   void *                           reloc_info;
 149   unsigned long                    num_relocs;
 150 };
 151
 152 /* A structure containing the name of a debug section
 153    and a pointer to a function that can decode it.  */
 154 struct dwarf_section_display
 155 {
 156   struct dwarf_section section;
 157   int (*display) (struct dwarf_section *, void *);
 158   int *enabled;
 159   bool relocate;
 160 };
 161
 162 extern struct dwarf_section_display debug_displays [];
 163
 164 /* This structure records the information that
 165    we extract from the.debug_info section.  */
 166 typedef struct
 167 {
 168   unsigned int   pointer_size;
 169   unsigned int   offset_size;
 170   int            dwarf_version;
 171   dwarf_vma      cu_offset;
 172   dwarf_vma      base_address;
 173   /* This field is filled in when reading the attribute DW_AT_GNU_addr_base and
 174      is used with the form DW_FORM_GNU_addr_index.  */
 175   dwarf_vma      addr_base;
 176   /* This field is filled in when reading the attribute DW_AT_GNU_ranges_base and
 177      is used when calculating ranges.  */
 178   dwarf_vma      ranges_base;
 179   /* This is an array of offsets to the location list table.  */
 180   dwarf_vma *    loc_offsets;
 181   /* This is an array of offsets to the location view table.  */
 182   dwarf_vma *    loc_views;
 183   int *          have_frame_base;
 184
 185   /* Information for associating location lists with CUs.  */
 186   unsigned int   num_loc_offsets;
 187   unsigned int   max_loc_offsets;
 188   unsigned int   num_loc_views;
 189   dwarf_vma      loclists_base;
 190
 191   /* List of .debug_ranges offsets seen in this .debug_info.  */
 192   dwarf_vma *    range_lists;
 193   unsigned int   num_range_lists;
 194   unsigned int   max_range_lists;
 195 }
 196 debug_info;
 197
 198 typedef struct separate_info
 199 {
 200   void *                  handle;    /* The pointer returned by open_debug_file().  */
 201   const char *            filename;
 202   struct separate_info *  next;
 203 } separate_info;
 204
 205 extern separate_info * first_separate_info;
 206
 207 extern unsigned int eh_addr_size;
 208
 209 extern int do_debug_info;
 210 extern int do_debug_abbrevs;
 211 extern int do_debug_lines;
 212 extern int do_debug_pubnames;
 213 extern int do_debug_pubtypes;
 214 extern int do_debug_aranges;
 215 extern int do_debug_ranges;
 216 extern int do_debug_frames;
 217 extern int do_debug_frames_interp;
 218 extern int do_debug_macinfo;
 219 extern int do_debug_str;
 220 extern int do_debug_str_offsets;
 221 extern int do_debug_loc;
 222 extern int do_gdb_index;
 223 extern int do_trace_info;
 224 extern int do_trace_abbrevs;
 225 extern int do_trace_aranges;
 226 extern int do_debug_addr;
 227 extern int do_debug_cu_index;
 228 extern int do_wide;
 229 extern int do_debug_links;
 230 extern int do_follow_links;
 231 #ifdef HAVE_LIBDEBUGINFOD
 232 extern int use_debuginfod;
 233 #endif
 234 extern bool do_checks;
 235
 236 extern int dwarf_cutoff_level;
 237 extern unsigned long dwarf_start_die;
 238
 239 extern int dwarf_check;
 240
 241 extern void init_dwarf_regnames_by_elf_machine_code (unsigned int);
 242 extern void init_dwarf_regnames_by_bfd_arch_and_mach (enum bfd_architecture arch,
 243                                                       unsigned long mach);
 244
 245 extern bool load_debug_section (enum dwarf_section_display_enum, void *);
 246 extern void free_debug_section (enum dwarf_section_display_enum);
 247 extern bool load_separate_debug_files (void *, const char *);
 248 extern void close_debug_file (void *);
 249 extern void *open_debug_file (const char *);
 250
 251 extern void free_debug_memory (void);
 252
 253 extern void dwarf_select_sections_by_names (const char *);
 254 extern void dwarf_select_sections_by_letters (const char *);
 255 extern void dwarf_select_sections_all (void);
 256
 257 extern unsigned int * find_cu_tu_set (void *, unsigned int);
 258
 259 extern void * cmalloc (size_t, size_t);
 260 extern void * xcalloc2 (size_t, size_t);
 261 extern void * xcmalloc (size_t, size_t);
 262 extern void * xcrealloc (void *, size_t, size_t);
 263
 264 /* A callback into the client.  Returns TRUE if there is a
 265    relocation against the given debug section at the given
 266    offset.  */
 267 extern bool reloc_at (struct dwarf_section *, dwarf_vma);
 268
 269 extern dwarf_vma read_leb128 (unsigned char *, const unsigned char *const,
 270                               bool, unsigned int *, int *);
 271
 272 #if HAVE_LIBDEBUGINFOD
 273 extern unsigned char * get_build_id (void *);
 274 #endif
 275
 276 static inline void
 277 report_leb_status (int status)
 278 {
 279   if ((status & 1) != 0)
 280     error (_("end of data encountered whilst reading LEB\n"));
 281   else if ((status & 2) != 0)
 282     error (_("read LEB value is too large to store in destination variable\n"));
 283 }
 284
 285 #define SKIP_ULEB(start, end)                                   \
 286   do                                                            \
 287     {                                                           \
 288       unsigned int _len;                                        \
 289       read_leb128 (start, end, false, &_len, NULL);             \
 290       start += _len;                                            \
 291     }                                                           \
 292   while (0)
 293
 294 #define SKIP_SLEB(start, end)                                   \
 295   do                                                            \
 296     {                                                           \
 297       unsigned int _len;                                        \
 298       read_leb128 (start, end, true, &_len, NULL);              \
 299       start += _len;                                            \
 300     }                                                           \
 301   while (0)
 302
 303 #define READ_ULEB(var, start, end)                              \
 304   do                                                            \
 305     {                                                           \
 306       dwarf_vma _val;                                           \
 307       unsigned int _len;                                        \
 308       int _status;                                              \
 309                                                                 \
 310       _val = read_leb128 (start, end, false, &_len, &_status);  \
 311       start += _len;                                            \
 312       (var) = _val;                                             \
 313       if ((var) != _val)                                        \
 314         _status |= 2;                                           \
 315       report_leb_status (_status);                              \
 316     }                                                           \
 317   while (0)
 318
 319 #define READ_SLEB(var, start, end)                              \
 320   do                                                            \
 321     {                                                           \
 322       dwarf_signed_vma _val;                                    \
 323       unsigned int _len;                                        \
 324       int _status;                                              \
 325                                                                 \
 326       _val = read_leb128 (start, end, true, &_len, &_status);   \
 327       start += _len;                                            \
 328       (var) = _val;                                             \
 329       if ((var) != _val)                                        \
 330         _status |= 2;                                           \
 331       report_leb_status (_status);                              \
 332     }                                                           \
 333   while (0)