gdb/symfile.h

   1 /* Definitions for reading symbol files into GDB.
   2
   3    Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   4    2000, 2001, 2002, 2003, 2004, 2007 Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #if !defined (SYMFILE_H)
  22 #define SYMFILE_H
  23
  24 /* This file requires that you first include "bfd.h".  */
  25 #include "symtab.h"
  26
  27 /* Opaque declarations.  */
  28 struct section_table;
  29 struct objfile;
  30 struct obj_section;
  31 struct obstack;
  32 struct block;
  33
  34 /* Partial symbols are stored in the psymbol_cache and pointers to
  35    them are kept in a dynamically grown array that is obtained from
  36    malloc and grown as necessary via realloc.  Each objfile typically
  37    has two of these, one for global symbols and one for static
  38    symbols.  Although this adds a level of indirection for storing or
  39    accessing the partial symbols, it allows us to throw away duplicate
  40    psymbols and set all pointers to the single saved instance.  */
  41
  42 struct psymbol_allocation_list
  43 {
  44
  45   /* Pointer to beginning of dynamically allocated array of pointers
  46      to partial symbols.  The array is dynamically expanded as
  47      necessary to accommodate more pointers.  */
  48
  49   struct partial_symbol **list;
  50
  51   /* Pointer to next available slot in which to store a pointer to a
  52      partial symbol.  */
  53
  54   struct partial_symbol **next;
  55
  56   /* Number of allocated pointer slots in current dynamic array (not
  57      the number of bytes of storage).  The "next" pointer will always
  58      point somewhere between list[0] and list[size], and when at
  59      list[size] the array will be expanded on the next attempt to
  60      store a pointer.  */
  61
  62   int size;
  63 };
  64
  65 /* Define an array of addresses to accommodate non-contiguous dynamic
  66    loading of modules.  This is for use when entering commands, so we
  67    can keep track of the section names until we read the file and can
  68    map them to bfd sections.  This structure is also used by solib.c
  69    to communicate the section addresses in shared objects to
  70    symbol_file_add ().  */
  71
  72 struct section_addr_info
  73 {
  74   /* The number of sections for which address information is
  75      available.  */
  76   size_t num_sections;
  77   /* Sections whose names are file format dependent. */
  78   struct other_sections
  79   {
  80     CORE_ADDR addr;
  81     char *name;
  82     int sectindex;
  83   } other[1];
  84 };
  85
  86 struct symfile_segment_data
  87 {
  88   /* How many segments are present in this file.  If there are
  89      two, the text segment is the first one and the data segment
  90      is the second one.  */
  91   int num_segments;
  92
  93   /* If NUM_SEGMENTS is greater than zero, the original base address
  94      of each segment.  */
  95   CORE_ADDR *segment_bases;
  96
  97   /* If NUM_SEGMENTS is greater than zero, the memory size of each
  98      segment.  */
  99   CORE_ADDR *segment_sizes;
 100
 101   /* If NUM_SEGMENTS is greater than zero, this is an array of entries
 102      recording which segment contains each BFD section.  It is
 103      ordered by section index.  A zero means that the section is not
 104      in any segment.  */
 105   int *segment_info;
 106 };
 107
 108 /* Structure to keep track of symbol reading functions for various
 109    object file types.  */
 110
 111 struct sym_fns
 112 {
 113
 114   /* BFD flavour that we handle, or (as a special kludge, see
 115      xcoffread.c, (enum bfd_flavour)-1 for xcoff).  */
 116
 117   enum bfd_flavour sym_flavour;
 118
 119   /* Initializes anything that is global to the entire symbol table.
 120      It is called during symbol_file_add, when we begin debugging an
 121      entirely new program.  */
 122
 123   void (*sym_new_init) (struct objfile *);
 124
 125   /* Reads any initial information from a symbol file, and initializes
 126      the struct sym_fns SF in preparation for sym_read().  It is
 127      called every time we read a symbol file for any reason.  */
 128
 129   void (*sym_init) (struct objfile *);
 130
 131   /* sym_read (objfile, mainline) Reads a symbol file into a psymtab
 132      (or possibly a symtab).  OBJFILE is the objfile struct for the
 133      file we are reading.  MAINLINE is 1 if this is the main symbol
 134      table being read, and 0 if a secondary symbol file (e.g. shared
 135      library or dynamically loaded file) is being read.  */
 136
 137   void (*sym_read) (struct objfile *, int);
 138
 139   /* Called when we are finished with an objfile.  Should do all
 140      cleanup that is specific to the object file format for the
 141      particular objfile.  */
 142
 143   void (*sym_finish) (struct objfile *);
 144
 145   /* This function produces a file-dependent section_offsets
 146      structure, allocated in the objfile's storage, and based on the
 147      parameter.  The parameter is currently a CORE_ADDR (FIXME!) for
 148      backward compatibility with the higher levels of GDB.  It should
 149      probably be changed to a string, where NULL means the default,
 150      and others are parsed in a file dependent way.  */
 151
 152   void (*sym_offsets) (struct objfile *, struct section_addr_info *);
 153
 154   /* This function produces a format-independent description of
 155      the segments of ABFD.  Each segment is a unit of the file
 156      which may be relocated independently.  */
 157
 158   struct symfile_segment_data *(*sym_segments) (bfd *abfd);
 159
 160   /* This function should read the linetable from the objfile when
 161      the line table cannot be read while processing the debugging
 162      information.  */
 163   void (*sym_read_linetable) (void);
 164
 165   /* Finds the next struct sym_fns.  They are allocated and
 166      initialized in whatever module implements the functions pointed
 167      to; an initializer calls add_symtab_fns to add them to the global
 168      chain.  */
 169
 170   struct sym_fns *next;
 171
 172 };
 173
 174 /* The default version of sym_fns.sym_offsets for readers that don't
 175    do anything special.  */
 176
 177 extern void default_symfile_offsets (struct objfile *objfile,
 178                                      struct section_addr_info *);
 179
 180 /* The default version of sym_fns.sym_segments for readers that don't
 181    do anything special.  */
 182
 183 extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
 184
 185 extern void extend_psymbol_list (struct psymbol_allocation_list *,
 186                                  struct objfile *);
 187
 188 /* Add any kind of symbol to a psymbol_allocation_list.  */
 189
 190 /* #include "demangle.h" */
 191
 192 extern const
 193 struct partial_symbol *add_psymbol_to_list (char *, int, domain_enum,
 194                                             enum address_class,
 195                                             struct psymbol_allocation_list *,
 196                                             long, CORE_ADDR,
 197                                             enum language, struct objfile *);
 198
 199 extern void init_psymbol_list (struct objfile *, int);
 200
 201 extern void sort_pst_symbols (struct partial_symtab *);
 202
 203 extern struct symtab *allocate_symtab (char *, struct objfile *);
 204
 205 extern int free_named_symtabs (char *);
 206
 207 extern void fill_in_vptr_fieldno (struct type *);
 208
 209 extern void add_symtab_fns (struct sym_fns *);
 210
 211 extern void syms_from_objfile (struct objfile *,
 212                                struct section_addr_info *,
 213                                struct section_offsets *, int, int, int);
 214
 215 extern void new_symfile_objfile (struct objfile *, int, int);
 216
 217 extern struct objfile *symbol_file_add (char *, int,
 218                                         struct section_addr_info *, int, int);
 219
 220 extern struct objfile *symbol_file_add_from_bfd (bfd *, int,
 221                                                  struct section_addr_info *,
 222                                                  int, int);
 223
 224 /* Create a new section_addr_info, with room for NUM_SECTIONS.  */
 225
 226 extern struct section_addr_info *alloc_section_addr_info (size_t
 227                                                           num_sections);
 228
 229 /* Return a freshly allocated copy of ADDRS.  The section names, if
 230    any, are also freshly allocated copies of those in ADDRS.  */
 231 extern struct section_addr_info *(copy_section_addr_info
 232                                   (struct section_addr_info *addrs));
 233
 234 /* Build (allocate and populate) a section_addr_info struct from an
 235    existing section table.  */
 236
 237 extern struct section_addr_info
 238   *build_section_addr_info_from_section_table (const struct section_table
 239                                                *start,
 240                                                const struct section_table
 241                                                *end);
 242
 243 /* Free all memory allocated by
 244    build_section_addr_info_from_section_table.  */
 245
 246 extern void free_section_addr_info (struct section_addr_info *);
 247
 248
 249 extern struct partial_symtab *start_psymtab_common (struct objfile *,
 250                                                     struct section_offsets *,
 251                                                     char *, CORE_ADDR,
 252                                                     struct partial_symbol **,
 253                                                     struct partial_symbol **);
 254
 255 /* Make a copy of the string at PTR with SIZE characters in the symbol
 256    obstack (and add a null character at the end in the copy).  Returns
 257    the address of the copy.  */
 258
 259 extern char *obsavestring (const char *, int, struct obstack *);
 260
 261 /* Concatenate strings S1, S2 and S3; return the new string.  Space is
 262    found in the OBSTACKP  */
 263
 264 extern char *obconcat (struct obstack *obstackp, const char *, const char *,
 265                        const char *);
 266
 267                         /*   Variables   */
 268
 269 /* If non-zero, shared library symbols will be added automatically
 270    when the inferior is created, new libraries are loaded, or when
 271    attaching to the inferior.  This is almost always what users will
 272    want to have happen; but for very large programs, the startup time
 273    will be excessive, and so if this is a problem, the user can clear
 274    this flag and then add the shared library symbols as needed.  Note
 275    that there is a potential for confusion, since if the shared
 276    library symbols are not loaded, commands like "info fun" will *not*
 277    report all the functions that are actually present.  */
 278
 279 extern int auto_solib_add;
 280
 281 /* For systems that support it, a threshold size in megabytes.  If
 282    automatically adding a new library's symbol table to those already
 283    known to the debugger would cause the total shared library symbol
 284    size to exceed this threshhold, then the shlib's symbols are not
 285    added.  The threshold is ignored if the user explicitly asks for a
 286    shlib to be added, such as when using the "sharedlibrary" command.  */
 287
 288 extern int auto_solib_limit;
 289
 290 /* From symfile.c */
 291
 292 extern struct partial_symtab *allocate_psymtab (char *, struct objfile *);
 293
 294 extern void discard_psymtab (struct partial_symtab *);
 295
 296 extern void find_lowest_section (bfd *, asection *, void *);
 297
 298 extern bfd *symfile_bfd_open (char *);
 299
 300 extern int get_section_index (struct objfile *, char *);
 301
 302 /* Utility functions for overlay sections: */
 303 extern enum overlay_debugging_state
 304 {
 305   ovly_off,
 306   ovly_on,
 307   ovly_auto
 308 } overlay_debugging;
 309 extern int overlay_cache_invalid;
 310
 311 /* Return the "mapped" overlay section containing the PC.  */
 312 extern asection *find_pc_mapped_section (CORE_ADDR);
 313
 314 /* Return any overlay section containing the PC (even in its LMA
 315    region).  */
 316 extern asection *find_pc_overlay (CORE_ADDR);
 317
 318 /* Return true if the section is an overlay.  */
 319 extern int section_is_overlay (asection *);
 320
 321 /* Return true if the overlay section is currently "mapped".  */
 322 extern int section_is_mapped (asection *);
 323
 324 /* Return true if pc belongs to section's VMA.  */
 325 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, asection *);
 326
 327 /* Return true if pc belongs to section's LMA.  */
 328 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, asection *);
 329
 330 /* Map an address from a section's LMA to its VMA.  */
 331 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, asection *);
 332
 333 /* Map an address from a section's VMA to its LMA.  */
 334 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, asection *);
 335
 336 /* Convert an address in an overlay section (force into VMA range).  */
 337 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, asection *);
 338
 339 /* Load symbols from a file.  */
 340 extern void symbol_file_add_main (char *args, int from_tty);
 341
 342 /* Clear GDB symbol tables.  */
 343 extern void symbol_file_clear (int from_tty);
 344
 345 /* Default overlay update function.  */
 346 extern void simple_overlay_update (struct obj_section *);
 347
 348 extern bfd_byte *symfile_relocate_debug_section (bfd *abfd, asection *sectp,
 349                                                  bfd_byte * buf);
 350
 351 extern int symfile_map_offsets_to_segments (bfd *,
 352                                             struct symfile_segment_data *,
 353                                             struct section_offsets *,
 354                                             int, const CORE_ADDR *);
 355 struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
 356 void free_symfile_segment_data (struct symfile_segment_data *data);
 357
 358 /* From dwarf2read.c */
 359
 360 extern int dwarf2_has_info (struct objfile *);
 361
 362 extern void dwarf2_build_psymtabs (struct objfile *, int);
 363 extern void dwarf2_build_frame_info (struct objfile *);
 364
 365 /* From mdebugread.c */
 366
 367 /* Hack to force structures to exist before use in parameter list.  */
 368 struct ecoff_debug_hack
 369 {
 370   struct ecoff_debug_swap *a;
 371   struct ecoff_debug_info *b;
 372 };
 373
 374 extern void mdebug_build_psymtabs (struct objfile *,
 375                                    const struct ecoff_debug_swap *,
 376                                    struct ecoff_debug_info *);
 377
 378 extern void elfmdebug_build_psymtabs (struct objfile *,
 379                                       const struct ecoff_debug_swap *,
 380                                       asection *);
 381
 382 #endif /* !defined(SYMFILE_H) */