gdb/symfile.h

   1 /* Definitions for reading symbol files into GDB.
   2    Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   3    2000, 2001
   4    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
  30 struct obstack;
  31
  32 /* Partial symbols are stored in the psymbol_cache and pointers to them
  33    are kept in a dynamically grown array that is obtained from malloc and
  34    grown as necessary via realloc.  Each objfile typically has two of these,
  35    one for global symbols and one for static symbols.  Although this adds
  36    a level of indirection for storing or accessing the partial symbols,
  37    it allows us to throw away duplicate psymbols and set all pointers
  38    to the single saved instance. */
  39
  40 struct psymbol_allocation_list
  41   {
  42
  43     /* Pointer to beginning of dynamically allocated array of pointers to
  44        partial symbols.  The array is dynamically expanded as necessary to
  45        accommodate more pointers. */
  46
  47     struct partial_symbol **list;
  48
  49     /* Pointer to next available slot in which to store a pointer to a partial
  50        symbol. */
  51
  52     struct partial_symbol **next;
  53
  54     /* Number of allocated pointer slots in current dynamic array (not the
  55        number of bytes of storage).  The "next" pointer will always point
  56        somewhere between list[0] and list[size], and when at list[size] the
  57        array will be expanded on the next attempt to store a pointer. */
  58
  59     int size;
  60   };
  61
  62 /* Define an array of addresses to accommodate non-contiguous dynamic
  63    loading of modules.  This is for use when entering commands, so we
  64    can keep track of the section names until we read the file and
  65    can map them to bfd sections.  This structure is also used by
  66    solib.c to communicate the section addresses in shared objects to
  67    symbol_file_add (). */
  68
  69 #define MAX_SECTIONS 64
  70 struct section_addr_info
  71 {
  72   /* Sections whose names are file format dependent. */
  73   struct other_sections
  74   {
  75     CORE_ADDR addr;
  76     char *name;
  77     int sectindex;
  78   } other[MAX_SECTIONS];
  79 };
  80
  81 /* Structure to keep track of symbol reading functions for various
  82    object file types.  */
  83
  84 struct sym_fns
  85   {
  86
  87     /* BFD flavour that we handle, or (as a special kludge, see xcoffread.c,
  88        (enum bfd_flavour)-1 for xcoff).  */
  89
  90     enum bfd_flavour sym_flavour;
  91
  92     /* Initializes anything that is global to the entire symbol table.  It is
  93        called during symbol_file_add, when we begin debugging an entirely new
  94        program. */
  95
  96     void (*sym_new_init) (struct objfile *);
  97
  98     /* Reads any initial information from a symbol file, and initializes the
  99        struct sym_fns SF in preparation for sym_read().  It is called every
 100        time we read a symbol file for any reason. */
 101
 102     void (*sym_init) (struct objfile *);
 103
 104     /* sym_read (objfile, mainline)
 105        Reads a symbol file into a psymtab (or possibly a symtab).
 106        OBJFILE is the objfile struct for the file we are reading.
 107        MAINLINE is 1 if this is the
 108        main symbol table being read, and 0 if a secondary
 109        symbol file (e.g. shared library or dynamically loaded file)
 110        is being read.  */
 111
 112     void (*sym_read) (struct objfile *, int);
 113
 114     /* Called when we are finished with an objfile.  Should do all cleanup
 115        that is specific to the object file format for the particular objfile. */
 116
 117     void (*sym_finish) (struct objfile *);
 118
 119     /* This function produces a file-dependent section_offsets structure,
 120        allocated in the objfile's storage, and based on the parameter.
 121        The parameter is currently a CORE_ADDR (FIXME!) for backward compatibility
 122        with the higher levels of GDB.  It should probably be changed to
 123        a string, where NULL means the default, and others are parsed in a file
 124        dependent way. */
 125
 126     void (*sym_offsets) (struct objfile *, struct section_addr_info *);
 127
 128     /* Finds the next struct sym_fns.  They are allocated and initialized
 129        in whatever module implements the functions pointed to; an
 130        initializer calls add_symtab_fns to add them to the global chain.  */
 131
 132     struct sym_fns *next;
 133
 134   };
 135
 136 /* The default version of sym_fns.sym_offsets for readers that don't
 137    do anything special.  */
 138
 139 extern void
 140 default_symfile_offsets (struct objfile *objfile, struct section_addr_info *);
 141
 142
 143 extern void
 144 extend_psymbol_list (struct psymbol_allocation_list *, struct objfile *);
 145
 146 /* Add any kind of symbol to a psymbol_allocation_list. */
 147
 148 /* #include "demangle.h" */
 149
 150 extern void
 151 add_psymbol_to_list (char *, int, namespace_enum, enum address_class,
 152                      struct psymbol_allocation_list *, long, CORE_ADDR,
 153                      enum language, struct objfile *);
 154
 155 extern void
 156 add_psymbol_with_dem_name_to_list (char *, int, char *, int, namespace_enum,
 157                                    enum address_class,
 158                                    struct psymbol_allocation_list *,
 159                                    long, CORE_ADDR,
 160                                    enum language, struct objfile *);
 161
 162
 163 extern void init_psymbol_list (struct objfile *, int);
 164
 165 extern void sort_pst_symbols (struct partial_symtab *);
 166
 167 extern struct symtab *allocate_symtab (char *, struct objfile *);
 168
 169 extern int free_named_symtabs (char *);
 170
 171 extern void fill_in_vptr_fieldno (struct type *);
 172
 173 extern void add_symtab_fns (struct sym_fns *);
 174
 175 extern void init_entry_point_info (struct objfile *);
 176
 177 extern void
 178 syms_from_objfile (struct objfile *, struct section_addr_info *, int, int);
 179
 180 extern void new_symfile_objfile (struct objfile *, int, int);
 181
 182 extern struct objfile *symbol_file_add (char *, int,
 183                                         struct section_addr_info *, int, int);
 184
 185 /* Build (allocate and populate) a section_addr_info struct from
 186    an existing section table. */
 187
 188 struct section_table;
 189 extern struct section_addr_info *
 190 build_section_addr_info_from_section_table (const struct section_table *start,
 191                                             const struct section_table *end);
 192
 193 /* Free all memory allocated by build_section_addr_info_from_section_table. */
 194
 195 extern void
 196 free_section_addr_info (struct section_addr_info *);
 197
 198
 199 extern struct partial_symtab *start_psymtab_common (struct objfile *,
 200                                                     struct section_offsets *,
 201                                                     char *, CORE_ADDR,
 202                                                     struct partial_symbol **,
 203                                                     struct partial_symbol **);
 204
 205 /* Sorting your symbols for fast lookup or alphabetical printing.  */
 206
 207 extern void sort_block_syms (struct block *);
 208
 209 extern void sort_symtab_syms (struct symtab *);
 210
 211 /* Make a copy of the string at PTR with SIZE characters in the symbol obstack
 212    (and add a null character at the end in the copy).
 213    Returns the address of the copy.  */
 214
 215 extern char *obsavestring (const char *, int, struct obstack *);
 216
 217 /* Concatenate strings S1, S2 and S3; return the new string.
 218    Space is found in the symbol_obstack.  */
 219
 220 extern char *obconcat (struct obstack *obstackp, const char *, const char *,
 221                        const char *);
 222
 223                         /*   Variables   */
 224
 225 /* If non-zero, shared library symbols will be added automatically
 226    when the inferior is created, new libraries are loaded, or when
 227    attaching to the inferior.  This is almost always what users will
 228    want to have happen; but for very large programs, the startup time
 229    will be excessive, and so if this is a problem, the user can clear
 230    this flag and then add the shared library symbols as needed.  Note
 231    that there is a potential for confusion, since if the shared
 232    library symbols are not loaded, commands like "info fun" will *not*
 233    report all the functions that are actually present. */
 234
 235 extern int auto_solib_add;
 236
 237 /* For systems that support it, a threshold size in megabytes.  If
 238    automatically adding a new library's symbol table to those already
 239    known to the debugger would cause the total shared library symbol
 240    size to exceed this threshhold, then the shlib's symbols are not
 241    added.  The threshold is ignored if the user explicitly asks for a
 242    shlib to be added, such as when using the "sharedlibrary"
 243    command. */
 244
 245 extern int auto_solib_limit;
 246
 247 /* From symfile.c */
 248
 249 extern CORE_ADDR entry_point_address (void);
 250
 251 extern struct partial_symtab *allocate_psymtab (char *, struct objfile *);
 252
 253 extern void discard_psymtab (struct partial_symtab *);
 254
 255 extern void find_lowest_section (bfd *, asection *, PTR);
 256
 257 extern bfd *symfile_bfd_open (char *);
 258
 259 extern int get_section_index (struct objfile *, char *);
 260
 261 /* Utility functions for overlay sections: */
 262 extern enum overlay_debugging_state {
 263   ovly_off,
 264   ovly_on,
 265   ovly_auto
 266 } overlay_debugging;
 267 extern int overlay_cache_invalid;
 268
 269 /* return the "mapped" overlay section  containing the PC */
 270 extern asection *find_pc_mapped_section (CORE_ADDR);
 271
 272 /* return any overlay section containing the PC (even in its LMA region) */
 273 extern asection *find_pc_overlay (CORE_ADDR);
 274
 275 /* return true if the section is an overlay */
 276 extern int section_is_overlay (asection *);
 277
 278 /* return true if the overlay section is currently "mapped" */
 279 extern int section_is_mapped (asection *);
 280
 281 /* return true if pc belongs to section's VMA */
 282 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, asection *);
 283
 284 /* return true if pc belongs to section's LMA */
 285 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, asection *);
 286
 287 /* map an address from a section's LMA to its VMA */
 288 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, asection *);
 289
 290 /* map an address from a section's VMA to its LMA */
 291 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, asection *);
 292
 293 /* convert an address in an overlay section (force into VMA range) */
 294 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, asection *);
 295
 296 /* Load symbols from a file. */
 297 extern void symbol_file_add_main (char *args, int from_tty);
 298
 299 /* Clear GDB symbol tables. */
 300 extern void symbol_file_clear (int from_tty);
 301
 302 /* From dwarfread.c */
 303
 304 extern void
 305 dwarf_build_psymtabs (struct objfile *, int, file_ptr, unsigned int,
 306                       file_ptr, unsigned int);
 307
 308 /* From dwarf2read.c */
 309
 310 extern int dwarf2_has_info (bfd * abfd);
 311
 312 extern void dwarf2_build_psymtabs (struct objfile *, int);
 313 extern void dwarf2_build_frame_info (struct objfile *);
 314
 315 /* From mdebugread.c */
 316
 317 /* Hack to force structures to exist before use in parameter list.  */
 318 struct ecoff_debug_hack
 319   {
 320     struct ecoff_debug_swap *a;
 321     struct ecoff_debug_info *b;
 322   };
 323 extern void
 324 mdebug_build_psymtabs (struct objfile *,
 325                        const struct ecoff_debug_swap *,
 326                        struct ecoff_debug_info *);
 327
 328 extern void
 329 elfmdebug_build_psymtabs (struct objfile *,
 330                           const struct ecoff_debug_swap *, asection *);
 331
 332 #endif /* !defined(SYMFILE_H) */