gdb/symfile.h

   1 /* Definitions for reading symbol files into GDB.
   2    Copyright (C) 1990, 1991, 1992, 1993, 1994, 1996
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #if !defined (SYMFILE_H)
  23 #define SYMFILE_H
  24
  25 /* This file requires that you first include "bfd.h".  */
  26
  27 /* Partial symbols are stored in the psymbol_cache and pointers to them
  28    are kept in a dynamically grown array that is obtained from malloc and
  29    grown as necessary via realloc.  Each objfile typically has two of these,
  30    one for global symbols and one for static symbols.  Although this adds
  31    a level of indirection for storing or accessing the partial symbols,
  32    it allows us to throw away duplicate psymbols and set all pointers
  33    to the single saved instance. */
  34
  35 struct psymbol_allocation_list
  36   {
  37
  38     /* Pointer to beginning of dynamically allocated array of pointers to
  39        partial symbols.  The array is dynamically expanded as necessary to
  40        accommodate more pointers. */
  41
  42     struct partial_symbol **list;
  43
  44     /* Pointer to next available slot in which to store a pointer to a partial
  45        symbol. */
  46
  47     struct partial_symbol **next;
  48
  49     /* Number of allocated pointer slots in current dynamic array (not the
  50        number of bytes of storage).  The "next" pointer will always point
  51        somewhere between list[0] and list[size], and when at list[size] the
  52        array will be expanded on the next attempt to store a pointer. */
  53
  54     int size;
  55   };
  56
  57 /* Define an array of addresses to accommodate non-contiguous dynamic
  58    loading of modules.  This is for use when entering commands, so we
  59    can keep track of the section names until we read the file and
  60    can map them to bfd sections.  This structure is also used by
  61    solib.c to communicate the section addresses in shared objects to
  62    symbol_file_add (). */
  63
  64 #define MAX_SECTIONS 40
  65 struct section_addr_info
  66 {
  67   /* Sections whose names are file format dependant. */
  68   struct other_sections
  69   {
  70     CORE_ADDR addr;
  71     char *name;
  72     int sectindex;
  73   } other[MAX_SECTIONS];
  74 };
  75
  76 /* Structure to keep track of symbol reading functions for various
  77    object file types.  */
  78
  79 struct sym_fns
  80   {
  81
  82     /* BFD flavour that we handle, or (as a special kludge, see xcoffread.c,
  83        (enum bfd_flavour)-1 for xcoff).  */
  84
  85     enum bfd_flavour sym_flavour;
  86
  87     /* Initializes anything that is global to the entire symbol table.  It is
  88        called during symbol_file_add, when we begin debugging an entirely new
  89        program. */
  90
  91     void (*sym_new_init) PARAMS ((struct objfile *));
  92
  93     /* Reads any initial information from a symbol file, and initializes the
  94        struct sym_fns SF in preparation for sym_read().  It is called every
  95        time we read a symbol file for any reason. */
  96
  97     void (*sym_init) PARAMS ((struct objfile *));
  98
  99     /* sym_read (objfile, mainline)
 100        Reads a symbol file into a psymtab (or possibly a symtab).
 101        OBJFILE is the objfile struct for the file we are reading.
 102        MAINLINE is 1 if this is the
 103        main symbol table being read, and 0 if a secondary
 104        symbol file (e.g. shared library or dynamically loaded file)
 105        is being read.  */
 106
 107     void (*sym_read) PARAMS ((struct objfile *, int));
 108
 109     /* Called when we are finished with an objfile.  Should do all cleanup
 110        that is specific to the object file format for the particular objfile. */
 111
 112     void (*sym_finish) PARAMS ((struct objfile *));
 113
 114     /* This function produces a file-dependent section_offsets structure,
 115        allocated in the objfile's storage, and based on the parameter.
 116        The parameter is currently a CORE_ADDR (FIXME!) for backward compatibility
 117        with the higher levels of GDB.  It should probably be changed to
 118        a string, where NULL means the default, and others are parsed in a file
 119        dependent way. */
 120
 121     void (*sym_offsets) PARAMS ((struct objfile *, struct section_addr_info *));
 122
 123     /* Finds the next struct sym_fns.  They are allocated and initialized
 124        in whatever module implements the functions pointed to; an
 125        initializer calls add_symtab_fns to add them to the global chain.  */
 126
 127     struct sym_fns *next;
 128
 129   };
 130
 131 /* The default version of sym_fns.sym_offsets for readers that don't
 132    do anything special.  */
 133
 134 extern void
 135 default_symfile_offsets (struct objfile *objfile, struct section_addr_info *);
 136
 137
 138 extern void
 139 extend_psymbol_list (struct psymbol_allocation_list *, struct objfile *);
 140
 141 /* Add any kind of symbol to a psymbol_allocation_list. */
 142
 143 /* #include "demangle.h" */
 144
 145 extern void
 146 add_psymbol_to_list (char *, int, namespace_enum, enum address_class,
 147                      struct psymbol_allocation_list *, long, CORE_ADDR,
 148                      enum language, struct objfile *);
 149
 150 extern void
 151 add_psymbol_with_dem_name_to_list (char *, int, char *, int, namespace_enum,
 152                                    enum address_class,
 153                                    struct psymbol_allocation_list *,
 154                                    long, CORE_ADDR,
 155                                    enum language, struct objfile *);
 156
 157
 158 extern void init_psymbol_list (struct objfile *, int);
 159
 160 extern void sort_pst_symbols (struct partial_symtab *);
 161
 162 extern struct symtab *allocate_symtab (char *, struct objfile *);
 163
 164 extern int free_named_symtabs (char *);
 165
 166 extern void fill_in_vptr_fieldno (struct type *);
 167
 168 extern void add_symtab_fns (struct sym_fns *);
 169
 170 extern void init_entry_point_info (struct objfile *);
 171
 172 extern void
 173 syms_from_objfile (struct objfile *, struct section_addr_info *, int, int);
 174
 175 extern void new_symfile_objfile (struct objfile *, int, int);
 176
 177 extern struct objfile *symbol_file_add (char *, int,
 178                                         struct section_addr_info *, int, int);
 179
 180 /* Build (allocate and populate) a section_addr_info struct from
 181    an existing section table. */
 182
 183 struct section_table;
 184 extern struct section_addr_info *
 185 build_section_addr_info_from_section_table (const struct section_table *start,
 186                                             const struct section_table *end);
 187
 188 /* Free all memory allocated by build_section_addr_info_from_section_table. */
 189
 190 extern void
 191 free_section_addr_info (struct section_addr_info *);
 192
 193
 194 extern struct partial_symtab *start_psymtab_common (struct objfile *,
 195                                                     struct section_offsets *,
 196                                                     char *, CORE_ADDR,
 197                                                     struct partial_symbol **,
 198                                                     struct partial_symbol **);
 199
 200 /* Sorting your symbols for fast lookup or alphabetical printing.  */
 201
 202 extern void sort_block_syms (struct block *);
 203
 204 extern void sort_symtab_syms (struct symtab *);
 205
 206 /* Make a copy of the string at PTR with SIZE characters in the symbol obstack
 207    (and add a null character at the end in the copy).
 208    Returns the address of the copy.  */
 209
 210 extern char *obsavestring (char *, int, struct obstack *);
 211
 212 /* Concatenate strings S1, S2 and S3; return the new string.
 213    Space is found in the symbol_obstack.  */
 214
 215 extern char *obconcat (struct obstack *obstackp, const char *, const char *,
 216                        const char *);
 217
 218                         /*   Variables   */
 219
 220 /* whether to auto load solibs at startup time:  0/1.
 221
 222    On all platforms, 0 means "don't auto load".
 223
 224    On HP-UX, > 0 means a threshhold, in megabytes, of symbol table which will
 225    be auto loaded.  When the cumulative size of solib symbol table exceeds
 226    this threshhold, solibs' symbol tables will not be loaded.
 227
 228    On other platforms, > 0 means, "always auto load".
 229  */
 230
 231 extern int auto_solib_add;
 232
 233 /* From symfile.c */
 234
 235 extern CORE_ADDR entry_point_address (void);
 236
 237 extern struct partial_symtab *allocate_psymtab (char *, struct objfile *);
 238
 239 extern void discard_psymtab (struct partial_symtab *);
 240
 241 extern void find_lowest_section (bfd *, asection *, PTR);
 242
 243 extern bfd *symfile_bfd_open (char *);
 244
 245 /* Utility functions for overlay sections: */
 246 extern int overlay_debugging;
 247 extern int overlay_cache_invalid;
 248
 249 /* return the "mapped" overlay section  containing the PC */
 250 extern asection *find_pc_mapped_section (CORE_ADDR);
 251
 252 /* return any overlay section containing the PC (even in its LMA region) */
 253 extern asection *find_pc_overlay (CORE_ADDR);
 254
 255 /* return true if the section is an overlay */
 256 extern int section_is_overlay (asection *);
 257
 258 /* return true if the overlay section is currently "mapped" */
 259 extern int section_is_mapped (asection *);
 260
 261 /* return true if pc belongs to section's VMA */
 262 extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, asection *);
 263
 264 /* return true if pc belongs to section's LMA */
 265 extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, asection *);
 266
 267 /* map an address from a section's LMA to its VMA */
 268 extern CORE_ADDR overlay_mapped_address (CORE_ADDR, asection *);
 269
 270 /* map an address from a section's VMA to its LMA */
 271 extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, asection *);
 272
 273 /* convert an address in an overlay section (force into VMA range) */
 274 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, asection *);
 275
 276 /* From dwarfread.c */
 277
 278 extern void
 279 dwarf_build_psymtabs (struct objfile *, int, file_ptr, unsigned int,
 280                       file_ptr, unsigned int);
 281
 282 /* From dwarf2read.c */
 283
 284 extern int dwarf2_has_info (bfd * abfd);
 285
 286 extern void dwarf2_build_psymtabs (struct objfile *, int);
 287
 288 /* From mdebugread.c */
 289
 290 /* Hack to force structures to exist before use in parameter list.  */
 291 struct ecoff_debug_hack
 292   {
 293     struct ecoff_debug_swap *a;
 294     struct ecoff_debug_info *b;
 295   };
 296 extern void
 297 mdebug_build_psymtabs (struct objfile *,
 298                        const struct ecoff_debug_swap *,
 299                        struct ecoff_debug_info *);
 300
 301 extern void
 302 elfmdebug_build_psymtabs (struct objfile *,
 303                           const struct ecoff_debug_swap *, asection *);
 304
 305 #endif /* !defined(SYMFILE_H) */