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, 2004 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.  */
29struct section_table;
30struct objfile;
31struct obstack;
32struct 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
42struct 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
72struct 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
89struct 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
144extern void default_symfile_offsets (struct objfile *objfile,
145				     struct section_addr_info *);
146
147
148extern 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
155extern const
156struct partial_symbol *add_psymbol_to_list (char *, int, domain_enum,
157					    enum address_class,
158					    struct psymbol_allocation_list *,
159					    long, CORE_ADDR,
160					    enum language, struct objfile *);
161
162extern void add_psymbol_with_dem_name_to_list (char *, int, char *, int,
163					       domain_enum,
164					       enum address_class,
165					       struct psymbol_allocation_list
166					       *, long, CORE_ADDR,
167					       enum language,
168					       struct objfile *);
169
170
171extern void init_psymbol_list (struct objfile *, int);
172
173extern void sort_pst_symbols (struct partial_symtab *);
174
175extern struct symtab *allocate_symtab (char *, struct objfile *);
176
177extern int free_named_symtabs (char *);
178
179extern void fill_in_vptr_fieldno (struct type *);
180
181extern void add_symtab_fns (struct sym_fns *);
182
183extern void syms_from_objfile (struct objfile *,
184			       struct section_addr_info *,
185			       struct section_offsets *, int, int, int);
186
187extern void new_symfile_objfile (struct objfile *, int, int);
188
189extern struct objfile *symbol_file_add (char *, int,
190					struct section_addr_info *, int, int);
191
192/* Create a new section_addr_info, with room for NUM_SECTIONS.  */
193
194extern struct section_addr_info *alloc_section_addr_info (size_t
195							  num_sections);
196
197/* Build (allocate and populate) a section_addr_info struct from an
198   existing section table.  */
199
200extern struct section_addr_info
201  *build_section_addr_info_from_section_table (const struct section_table
202					       *start,
203					       const struct section_table
204					       *end);
205
206/* Free all memory allocated by
207   build_section_addr_info_from_section_table.  */
208
209extern void free_section_addr_info (struct section_addr_info *);
210
211
212extern struct partial_symtab *start_psymtab_common (struct objfile *,
213						    struct section_offsets *,
214						    char *, CORE_ADDR,
215						    struct partial_symbol **,
216						    struct partial_symbol **);
217
218/* Make a copy of the string at PTR with SIZE characters in the symbol
219   obstack (and add a null character at the end in the copy).  Returns
220   the address of the copy.  */
221
222extern char *obsavestring (const char *, int, struct obstack *);
223
224/* Concatenate strings S1, S2 and S3; return the new string.  Space is
225   found in the OBSTACKP  */
226
227extern char *obconcat (struct obstack *obstackp, const char *, const char *,
228		       const char *);
229
230			/*   Variables   */
231
232/* If non-zero, shared library symbols will be added automatically
233   when the inferior is created, new libraries are loaded, or when
234   attaching to the inferior.  This is almost always what users will
235   want to have happen; but for very large programs, the startup time
236   will be excessive, and so if this is a problem, the user can clear
237   this flag and then add the shared library symbols as needed.  Note
238   that there is a potential for confusion, since if the shared
239   library symbols are not loaded, commands like "info fun" will *not*
240   report all the functions that are actually present.  */
241
242extern int auto_solib_add;
243
244/* For systems that support it, a threshold size in megabytes.  If
245   automatically adding a new library's symbol table to those already
246   known to the debugger would cause the total shared library symbol
247   size to exceed this threshhold, then the shlib's symbols are not
248   added.  The threshold is ignored if the user explicitly asks for a
249   shlib to be added, such as when using the "sharedlibrary" command.  */
250
251extern int auto_solib_limit;
252
253/* From symfile.c */
254
255extern struct partial_symtab *allocate_psymtab (char *, struct objfile *);
256
257extern void discard_psymtab (struct partial_symtab *);
258
259extern void find_lowest_section (bfd *, asection *, void *);
260
261extern bfd *symfile_bfd_open (char *);
262
263extern int get_section_index (struct objfile *, char *);
264
265/* Utility functions for overlay sections: */
266extern enum overlay_debugging_state
267{
268  ovly_off,
269  ovly_on,
270  ovly_auto
271} overlay_debugging;
272extern int overlay_cache_invalid;
273
274/* Return the "mapped" overlay section containing the PC.  */
275extern asection *find_pc_mapped_section (CORE_ADDR);
276
277/* Return any overlay section containing the PC (even in its LMA
278   region).  */
279extern asection *find_pc_overlay (CORE_ADDR);
280
281/* Return true if the section is an overlay.  */
282extern int section_is_overlay (asection *);
283
284/* Return true if the overlay section is currently "mapped".  */
285extern int section_is_mapped (asection *);
286
287/* Return true if pc belongs to section's VMA.  */
288extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, asection *);
289
290/* Return true if pc belongs to section's LMA.  */
291extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, asection *);
292
293/* Map an address from a section's LMA to its VMA.  */
294extern CORE_ADDR overlay_mapped_address (CORE_ADDR, asection *);
295
296/* Map an address from a section's VMA to its LMA.  */
297extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, asection *);
298
299/* Convert an address in an overlay section (force into VMA range).  */
300extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, asection *);
301
302/* Load symbols from a file.  */
303extern void symbol_file_add_main (char *args, int from_tty);
304
305/* Clear GDB symbol tables.  */
306extern void symbol_file_clear (int from_tty);
307
308extern bfd_byte *symfile_relocate_debug_section (bfd *abfd, asection *sectp,
309						 bfd_byte * buf);
310
311/* From dwarfread.c */
312
313extern void dwarf_build_psymtabs (struct objfile *, int, file_ptr,
314				  unsigned int, file_ptr, unsigned int);
315
316/* From dwarf2read.c */
317
318extern int dwarf2_has_info (bfd *abfd);
319
320extern void dwarf2_build_psymtabs (struct objfile *, int);
321extern void dwarf2_build_frame_info (struct objfile *);
322
323/* From mdebugread.c */
324
325/* Hack to force structures to exist before use in parameter list.  */
326struct ecoff_debug_hack
327{
328  struct ecoff_debug_swap *a;
329  struct ecoff_debug_info *b;
330};
331
332extern void mdebug_build_psymtabs (struct objfile *,
333				   const struct ecoff_debug_swap *,
334				   struct ecoff_debug_info *);
335
336extern void elfmdebug_build_psymtabs (struct objfile *,
337				      const struct ecoff_debug_swap *,
338				      asection *);
339
340#endif /* !defined(SYMFILE_H) */
341