gdb/symfile.h

   1 /* Definitions for reading symbol files into GDB.
   2
   3    Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   4    1999, 2000, 2001, 2002, 2003 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 2 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, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #if !defined (SYMFILE_H)
  24 #define SYMFILE_H
  25
  26 /* This file requires that you first include "bfd.h".  */
  27
  28 /* Opaque declarations.  */
  29 struct section_table;
  30 struct objfile;
  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 /* Structure to keep track of symbol reading functions for various
  87    object file types.  */
  88
  89 struct sym_fns
  90 {
  91
  92   /* BFD flavour that we handle, or (as a special kludge, see
  93      xcoffread.c, (enum bfd_flavour)-1 for xcoff).  */
  94
  95   enum bfd_flavour sym_flavour;
  96
  97   /* Initializes anything that is global to the entire symbol table.
  98      It is called during symbol_file_add, when we begin debugging an
  99      entirely new program.  */
 100
 101   void (*sym_new_init) (struct objfile *);
 102
 103   /* Reads any initial information from a symbol file, and initializes
 104      the struct sym_fns SF in preparation for sym_read().  It is
 105      called every time we read a symbol file for any reason.  */
 106
 107   void (*sym_init) (struct objfile *);
 108
 109   /* sym_read (objfile, mainline) Reads a symbol file into a psymtab
 110      (or possibly a symtab).  OBJFILE is the objfile struct for the
 111      file we are reading.  MAINLINE is 1 if this is the main symbol
 112      table being read, and 0 if a secondary symbol file (e.g. shared
 113      library or dynamically loaded file) is being read.  */
 114
 115   void (*sym_read) (struct objfile *, int);
 116
 117   /* Called when we are finished with an objfile.  Should do all
 118      cleanup that is specific to the object file format for the
 119      particular objfile.  */
 120
 121   void (*sym_finish) (struct objfile *);
 122
 123   /* This function produces a file-dependent section_offsets
 124      structure, allocated in the objfile's storage, and based on the
 125      parameter.  The parameter is currently a CORE_ADDR (FIXME!) for
 126      backward compatibility with the higher levels of GDB.  It should
 127      probably be changed to a string, where NULL means the default,
 128      and others are parsed in a file dependent way.  */
 129
 130   void (*sym_offsets) (struct objfile *, struct section_addr_info *);
 131
 132   /* Finds the next struct sym_fns.  They are allocated and
 133      initialized in whatever module implements the functions pointed
 134      to; an initializer calls add_symtab_fns to add them to the global
 135      chain.  */
 136
 137   struct sym_fns *next;
 138
 139 };
 140
 141 /* The default version of sym_fns.sym_offsets for readers that don't
 142    do anything special.  */
 143
 144 extern void default_symfile_offsets (struct objfile *objfile,
 145                                      struct section_addr_info *);
 146
 147
 148 extern void extend_psymbol_list (struct psymbol_allocation_list *,
 149                                  struct objfile *);
 150
 151 /* Add any kind of symbol to a psymbol_allocation_list.  */
 152
 153 /* #include "demangle.h" */
 154
 155 extern void add_psymbol_to_list (char *, int, domain_enum, enum address_class,
 156                                  struct psymbol_allocation_list *, long,
 157                                  CORE_ADDR, enum language, struct objfile *);
 158
 159 extern void add_psymbol_with_dem_name_to_list (char *, int, char *, int,
 160                                                domain_enum,
 161                                                enum address_class,
 162                                                struct psymbol_allocation_list
 163                                                *, long, CORE_ADDR,
 164                                                enum language,
 165                                                struct objfile *);
 166
 167
 168 extern void init_psymbol_list (struct objfile *, int);
 169
 170 extern void sort_pst_symbols (struct partial_symtab *);
 171
 172 extern struct symtab *allocate_symtab (char *, struct objfile *);
 173
 174 extern int free_named_symtabs (char *);
 175
 176 extern void fill_in_vptr_fieldno (struct type *);
 177
 178 extern void add_symtab_fns (struct sym_fns *);
 179
 180 extern void init_entry_point_info (struct objfile *);
 181
 182 extern void syms_from_objfile (struct objfile *,
 183                                struct section_addr_info *,
 184                                struct section_offsets *, int, int, int);
 185
 186 extern void new_symfile_objfile (struct objfile *, int, int);
 187
 188 extern struct objfile *symbol_file_add (char *, int,
 189                                         struct section_addr_info *, int, int);
 190
 191 /* Create a new section_addr_info, with room for NUM_SECTIONS.  */
 192
 193 extern struct section_addr_info *alloc_section_addr_info (size_t
 194                                                           num_sections);
 195
 196 /* Build (allocate and populate) a section_addr_info struct from an
 197    existing section table.  */
 198
 199 extern struct section_addr_info
 200   *build_section_addr_info_from_section_table (const struct section_table
 201                                                *start,
 202                                                const struct section_table
 203                                                *end);
 204
 205 /* Free all memory allocated by
 206    build_section_addr_info_from_section_table.  */
 207
 208 extern void free_section_addr_info (struct section_addr_info *);
 209
 210
 211 extern struct partial_symtab *start_psymtab_common (struct objfile *,
 212                                                     struct section_offsets *,
 213                                                     char *, CORE_ADDR,
 214                                                     struct partial_symbol **,
 215                                                     struct partial_symbol **);
 216
 217 /* Make a copy of the string at PTR with SIZE characters in the symbol
 218    obstack (and add a null character at the end in the copy).  Returns
 219    the address of the copy.  */
 220
 221 extern char *obsavestring (const char *, int, struct obstack *);
 222
 223 /* Concatenate strings S1, S2 and S3; return the new string.  Space is
 224    found in the symbol_obstack.  */
 225
 226 extern char *obconcat (struct obstack *obstackp, const char *, const char *,
 227                        const char *);
 228
 229                         /*   Variables   */
 230
 231 /* If non-zero, shared library symbols will be added automatically
 232    when the inferior is created, new libraries are loaded, or when
 233    attaching to the inferior.  This is almost always what users will
 234    want to have happen; but for very large programs, the startup time
 235    will be excessive, and so if this is a problem, the user can clear
 236    this flag and then add the shared library symbols as needed.  Note
 237    that there is a potential for confusion, since if the shared
 238    library symbols are not loaded, commands like "info fun" will *not*
 239    report all the functions that are actually present.  */
 240
 241 extern int auto_solib_add;
 242
 243 /* For systems that support it, a threshold size in megabytes.  If
 244    automatically adding a new library's symbol table to those already
 245    known to the debugger would cause the total shared library symbol
 246    size to exceed this threshhold, then the shlib's symbols are not
 247    added.  The threshold is ignored if the user explicitly asks for a
 248    shlib to be added, such as when using the "sharedlibrary" command.  */
 249
 250 extern int auto_solib_limit;
 251
 252 /* From symfile.c */
 253
 254 extern CORE_ADDR entry_point_address (void);
 255
 256 extern struct partial_symtab *allocate_psymtab (char *, struct objfile *);
 257
 258 extern void discard_psymtab (struct partial_symtab *);
 259
 260 extern void find_lowest_section (bfd *, asection *, void *);
 261
 262 extern bfd *symfile_bfd_open (char *);
 263
 264 extern int get_section_index (struct objfile *, char *);
 265
 266 /* Utility functions for overlay sections: */
 267 extern enum overlay_debugging_state
 268 {
 269   ovly_off,
 270   ovly_on,
 271   ovly_auto
 272 } overlay_debugging;
 273 extern int overlay_cache_invalid;
 274
 275 /* Return the "mapped" overlay section containing the PC.  */
 276 extern asection *find_pc_mapped_section (CORE_ADDR);
 277
 278 /* Return any overlay section containing the PC (even in its LMA
 279    region).  */
 280 extern asection *find_pc_overlay (CORE_ADDR);
 281
 282 /* Return true if the section is an overlay.  */
 283 extern int section_is_overlay (asection *);
 284
 285 /* Return true if the overlay section is currently "mapped".  */
 286 extern int section_is_mapped (asection *);
 287
 288 /* Return true if pc belongs to section's VMA.  */
 289 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, asection *);
 290
 291 /* Return true if pc belongs to section's LMA.  */
 292 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, asection *);
 293
 294 /* Map an address from a section's LMA to its VMA.  */
 295 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, asection *);
 296
 297 /* Map an address from a section's VMA to its LMA.  */
 298 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, asection *);
 299
 300 /* Convert an address in an overlay section (force into VMA range).  */
 301 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, asection *);
 302
 303 /* Load symbols from a file.  */
 304 extern void symbol_file_add_main (char *args, int from_tty);
 305
 306 /* Clear GDB symbol tables.  */
 307 extern void symbol_file_clear (int from_tty);
 308
 309 extern bfd_byte *symfile_relocate_debug_section (bfd *abfd, asection *sectp,
 310                                                  bfd_byte * buf);
 311
 312 /* From dwarfread.c */
 313
 314 extern void dwarf_build_psymtabs (struct objfile *, int, file_ptr,
 315                                   unsigned int, file_ptr, unsigned int);
 316
 317 /* From dwarf2read.c */
 318
 319 extern int dwarf2_has_info (bfd *abfd);
 320
 321 extern void dwarf2_build_psymtabs (struct objfile *, int);
 322 extern void dwarf2_build_frame_info (struct objfile *);
 323
 324 /* From mdebugread.c */
 325
 326 /* Hack to force structures to exist before use in parameter list.  */
 327 struct ecoff_debug_hack
 328 {
 329   struct ecoff_debug_swap *a;
 330   struct ecoff_debug_info *b;
 331 };
 332
 333 extern void mdebug_build_psymtabs (struct objfile *,
 334                                    const struct ecoff_debug_swap *,
 335                                    struct ecoff_debug_info *);
 336
 337 extern void elfmdebug_build_psymtabs (struct objfile *,
 338                                       const struct ecoff_debug_swap *,
 339                                       asection *);
 340
 341 #endif /* !defined(SYMFILE_H) */