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 /* Structure found in the .debug_line section.  */
  24 typedef struct
  25 {
  26   uint64_t       li_length;
  27   unsigned short li_version;
  28   unsigned char  li_address_size;
  29   unsigned char  li_segment_size;
  30   uint64_t       li_prologue_length;
  31   unsigned char  li_min_insn_length;
  32   unsigned char  li_max_ops_per_insn;
  33   unsigned char  li_default_is_stmt;
  34   int            li_line_base;
  35   unsigned char  li_line_range;
  36   unsigned char  li_opcode_base;
  37   unsigned int   li_offset_size;
  38 }
  39 DWARF2_Internal_LineInfo;
  40
  41 /* Structure found in .debug_pubnames section.  */
  42 typedef struct
  43 {
  44   uint64_t       pn_length;
  45   unsigned short pn_version;
  46   uint64_t       pn_offset;
  47   uint64_t       pn_size;
  48 }
  49 DWARF2_Internal_PubNames;
  50
  51 /* Structure found in .debug_info section.  */
  52 typedef struct
  53 {
  54   uint64_t       cu_length;
  55   unsigned short cu_version;
  56   uint64_t       cu_abbrev_offset;
  57   unsigned char  cu_pointer_size;
  58   enum dwarf_unit_type cu_unit_type;
  59 }
  60 DWARF2_Internal_CompUnit;
  61
  62 /* Structure found in .debug_aranges section.  */
  63 typedef struct
  64 {
  65   uint64_t       ar_length;
  66   unsigned short ar_version;
  67   uint64_t       ar_info_offset;
  68   unsigned char  ar_pointer_size;
  69   unsigned char  ar_segment_size;
  70 }
  71 DWARF2_Internal_ARange;
  72
  73 /* N.B. The order here must match the order in debug_displays.  */
  74
  75 enum dwarf_section_display_enum
  76 {
  77   abbrev = 0,
  78   aranges,
  79   frame,
  80   info,
  81   line,
  82   pubnames,
  83   gnu_pubnames,
  84   eh_frame,
  85   macinfo,
  86   macro,
  87   str,
  88   line_str,
  89   loc,
  90   loclists,
  91   loclists_dwo,
  92   pubtypes,
  93   gnu_pubtypes,
  94   ranges,
  95   rnglists,
  96   rnglists_dwo,
  97   static_func,
  98   static_vars,
  99   types,
 100   weaknames,
 101   gdb_index,
 102   debug_names,
 103   trace_info,
 104   trace_abbrev,
 105   trace_aranges,
 106   info_dwo,
 107   abbrev_dwo,
 108   types_dwo,
 109   line_dwo,
 110   loc_dwo,
 111   macro_dwo,
 112   macinfo_dwo,
 113   str_dwo,
 114   str_index,
 115   str_index_dwo,
 116   debug_addr,
 117   dwp_cu_index,
 118   dwp_tu_index,
 119   gnu_debuglink,
 120   gnu_debugaltlink,
 121   debug_sup,
 122   separate_debug_str,
 123   note_gnu_build_id,
 124   max
 125 };
 126
 127 struct dwarf_section
 128 {
 129   /* A debug section has a different name when it's stored compressed
 130      or not.  XCOFF DWARF section also have a special name.
 131      COMPRESSED_NAME, UNCOMPRESSED_NAME and XCOFF_NAME are the three
 132      possibilities.  NAME is set to whichever one is used for this
 133      input file, as determined by load_debug_section().  */
 134   const char *                     uncompressed_name;
 135   const char *                     compressed_name;
 136   const char *                     xcoff_name;
 137   const char *                     name;
 138   /* If non-NULL then FILENAME is the name of the separate debug info
 139      file containing the section.  */
 140   const char *                     filename;
 141   unsigned char *                  start;
 142   uint64_t                         address;
 143   uint64_t                         size;
 144   enum dwarf_section_display_enum  abbrev_sec;
 145   /* Used by clients to help them implement the reloc_at callback.  */
 146   void *                           reloc_info;
 147   unsigned long                    num_relocs;
 148 };
 149
 150 /* A structure containing the name of a debug section
 151    and a pointer to a function that can decode it.  */
 152 struct dwarf_section_display
 153 {
 154   struct dwarf_section section;
 155   int (*display) (struct dwarf_section *, void *);
 156   int *enabled;
 157   bool relocate;
 158 };
 159
 160 extern struct dwarf_section_display debug_displays [];
 161
 162 /* This structure records the information that
 163    we extract from the.debug_info section.  */
 164 typedef struct
 165 {
 166   unsigned int   pointer_size;
 167   unsigned int   offset_size;
 168   int            dwarf_version;
 169   uint64_t       cu_offset;
 170   uint64_t       base_address;
 171   /* This field is filled in when reading the attribute DW_AT_GNU_addr_base and
 172      is used with the form DW_FORM_GNU_addr_index.  */
 173   uint64_t       addr_base;
 174   /* This field is filled in when reading the attribute DW_AT_GNU_ranges_base and
 175      is used when calculating ranges.  */
 176   uint64_t       ranges_base;
 177   /* This is an array of offsets to the location list table.  */
 178   uint64_t *     loc_offsets;
 179   /* This is an array of offsets to the location view table.  */
 180   uint64_t *     loc_views;
 181   int *          have_frame_base;
 182
 183   /* Information for associating location lists with CUs.  */
 184   unsigned int   num_loc_offsets;
 185   unsigned int   max_loc_offsets;
 186   unsigned int   num_loc_views;
 187   uint64_t       loclists_base;
 188
 189   /* List of .debug_ranges offsets seen in this .debug_info.  */
 190   uint64_t *     range_lists;
 191   unsigned int   num_range_lists;
 192   unsigned int   max_range_lists;
 193   uint64_t       rnglists_base;
 194   uint64_t       str_offsets_base;
 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 int dwarf_select_sections_by_names (const char *);
 254 extern int 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 *, uint64_t);
 268
 269 extern uint64_t 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       uint64_t _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       int64_t _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)