1 /* Definitions for reading symbol files into GDB.
3 Copyright (C) 1990-2024 Free Software Foundation, Inc.
5 This file is part of GDB.
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 3 of the License, or
10 (at your option) any later version.
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.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #if !defined (SYMFILE_H)
23 /* This file requires that you first include "bfd.h". */
26 #include "symfile-add-flags.h"
27 #include "objfile-flags.h"
29 #include "gdbsupport/function-view.h"
30 #include "target-section.h"
31 #include "quick-symbol.h"
33 /* Opaque declarations. */
34 struct target_section
;
47 other_sections (CORE_ADDR addr_
, std::string
&&name_
, int sectindex_
)
49 name (std::move (name_
)),
50 sectindex (sectindex_
)
54 other_sections (other_sections
&&other
) = default;
56 DISABLE_COPY_AND_ASSIGN (other_sections
);
61 /* SECTINDEX must be valid for associated BFD or set to -1.
62 See syms_from_objfile_1 for an exception to this rule.
67 /* Define an array of addresses to accommodate non-contiguous dynamic
68 loading of modules. This is for use when entering commands, so we
69 can keep track of the section names until we read the file and can
70 map them to bfd sections. This structure is also used by solib.c
71 to communicate the section addresses in shared objects to
72 symbol_file_add (). */
74 typedef std::vector
<other_sections
> section_addr_info
;
76 /* A table listing the load segments in a symfile, and which segment
77 each BFD section belongs to. */
78 struct symfile_segment_data
82 segment (CORE_ADDR base
, CORE_ADDR size
)
83 : base (base
), size (size
)
86 /* The original base address the segment. */
89 /* The memory size of the segment. */
93 /* The segments present in this file. If there are
94 two, the text segment is the first one and the data segment
96 std::vector
<segment
> segments
;
98 /* This is an array of entries recording which segment contains each BFD
99 section. SEGMENT_INFO[I] is S+1 if the I'th BFD section belongs to segment
100 S, or zero if it is not in any segment. */
101 std::vector
<int> segment_info
;
104 using symfile_segment_data_up
= std::unique_ptr
<symfile_segment_data
>;
106 /* Structure of functions used for probe support. If one of these functions
107 is provided, all must be. */
111 /* If non-NULL, return a reference to vector of probe objects. */
112 const std::vector
<std::unique_ptr
<probe
>> &(*sym_get_probes
)
116 /* Structure to keep track of symbol reading functions for various
117 object file types. */
121 /* Initializes anything that is global to the entire symbol table.
122 It is called during symbol_file_add, when we begin debugging an
123 entirely new program. */
125 void (*sym_new_init
) (struct objfile
*);
127 /* Reads any initial information from a symbol file, and initializes
128 the struct sym_fns SF in preparation for sym_read(). It is
129 called every time we read a symbol file for any reason. */
131 void (*sym_init
) (struct objfile
*);
133 /* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
134 (or possibly a symtab). OBJFILE is the objfile struct for the
135 file we are reading. SYMFILE_FLAGS are the flags passed to
136 symbol_file_add & co. */
138 void (*sym_read
) (struct objfile
*, symfile_add_flags
);
140 /* Called when we are finished with an objfile. Should do all
141 cleanup that is specific to the object file format for the
142 particular objfile. */
144 void (*sym_finish
) (struct objfile
*);
147 /* This function produces a file-dependent section_offsets
148 structure, allocated in the objfile's storage.
150 The section_addr_info structure contains the offset of loadable and
151 allocated sections, relative to the absolute offsets found in the BFD. */
153 void (*sym_offsets
) (struct objfile
*, const section_addr_info
&);
155 /* This function produces a format-independent description of
156 the segments of ABFD. Each segment is a unit of the file
157 which may be relocated independently. */
159 symfile_segment_data_up (*sym_segments
) (bfd
*abfd
);
161 /* This function should read the linetable from the objfile when
162 the line table cannot be read while processing the debugging
165 void (*sym_read_linetable
) (struct objfile
*);
167 /* Relocate the contents of a debug section SECTP. The
168 contents are stored in BUF if it is non-NULL, or returned in a
169 malloc'd buffer otherwise. */
171 bfd_byte
*(*sym_relocate
) (struct objfile
*, asection
*sectp
, bfd_byte
*buf
);
173 /* If non-NULL, this objfile has probe support, and all the probe
174 functions referred to here will be non-NULL. */
175 const struct sym_probe_fns
*sym_probe_fns
;
178 extern section_addr_info
179 build_section_addr_info_from_objfile (const struct objfile
*objfile
);
181 extern void relative_addr_info_to_section_offsets
182 (section_offsets
§ion_offsets
, const section_addr_info
&addrs
);
184 extern void addr_info_make_relative (section_addr_info
*addrs
,
187 /* The default version of sym_fns.sym_offsets for readers that don't
188 do anything special. */
190 extern void default_symfile_offsets (struct objfile
*objfile
,
191 const section_addr_info
&);
193 /* The default version of sym_fns.sym_segments for readers that don't
194 do anything special. */
196 extern symfile_segment_data_up
default_symfile_segments (bfd
*abfd
);
198 /* The default version of sym_fns.sym_relocate for readers that don't
199 do anything special. */
201 extern bfd_byte
*default_symfile_relocate (struct objfile
*objfile
,
202 asection
*sectp
, bfd_byte
*buf
);
204 extern struct symtab
*allocate_symtab
205 (struct compunit_symtab
*cust
, const char *filename
, const char *id
)
206 ATTRIBUTE_NONNULL (1);
208 /* Same as the above, but passes FILENAME for ID. */
210 static inline struct symtab
*
211 allocate_symtab (struct compunit_symtab
*cust
, const char *filename
)
213 return allocate_symtab (cust
, filename
, filename
);
216 extern struct compunit_symtab
*allocate_compunit_symtab (struct objfile
*,
218 ATTRIBUTE_NONNULL (1);
220 extern void add_compunit_symtab_to_objfile (struct compunit_symtab
*cu
);
222 extern void add_symtab_fns (enum bfd_flavour flavour
, const struct sym_fns
*);
224 extern void clear_symtab_users (symfile_add_flags add_flags
);
226 extern enum language
deduce_language_from_filename (const char *);
228 /* Map the filename extension EXT to the language LANG. Any previous
229 association of EXT will be removed. EXT will be copied by this
231 extern void add_filename_language (const char *ext
, enum language lang
);
233 extern struct objfile
*symbol_file_add (const char *, symfile_add_flags
,
234 section_addr_info
*, objfile_flags
);
236 extern struct objfile
*symbol_file_add_from_bfd (const gdb_bfd_ref_ptr
&,
237 const char *, symfile_add_flags
,
239 objfile_flags
, struct objfile
*parent
);
241 extern void symbol_file_add_separate (const gdb_bfd_ref_ptr
&, const char *,
242 symfile_add_flags
, struct objfile
*);
244 /* Find separate debuginfo for OBJFILE (using .gnu_debuglink section).
245 Returns pathname, or an empty string.
247 Any warnings generated as part of this lookup are added to WARNINGS. If
248 some other mechanism can be used to lookup the debug information then
249 the warning will not be shown, however, if GDB fails to find suitable
250 debug information using any approach, then any warnings will be
253 extern std::string find_separate_debug_file_by_debuglink
254 (struct objfile
*objfile
, deferred_warnings
*warnings
);
256 /* Build (allocate and populate) a section_addr_info struct from an
257 existing section table. */
259 extern section_addr_info
260 build_section_addr_info_from_section_table (const std::vector
<target_section
> &table
);
264 /* If true, shared library symbols will be added automatically
265 when the inferior is created, new libraries are loaded, or when
266 attaching to the inferior. This is almost always what users will
267 want to have happen; but for very large programs, the startup time
268 will be excessive, and so if this is a problem, the user can clear
269 this flag and then add the shared library symbols as needed. Note
270 that there is a potential for confusion, since if the shared
271 library symbols are not loaded, commands like "info fun" will *not*
272 report all the functions that are actually present. */
274 extern bool auto_solib_add
;
278 extern void set_initial_language (void);
280 extern gdb_bfd_ref_ptr
symfile_bfd_open (const char *);
282 /* Like symfile_bfd_open, but will not throw an exception on error.
283 Instead, it issues a warning and returns nullptr. */
285 extern gdb_bfd_ref_ptr
symfile_bfd_open_no_error (const char *) noexcept
;
287 extern int get_section_index (struct objfile
*, const char *);
289 extern int print_symbol_loading_p (int from_tty
, int mainline
, int full
);
291 /* Utility functions for overlay sections: */
292 extern enum overlay_debugging_state
298 extern int overlay_cache_invalid
;
300 /* Return the "mapped" overlay section containing the PC. */
301 extern struct obj_section
*find_pc_mapped_section (CORE_ADDR
);
303 /* Return any overlay section containing the PC (even in its LMA
305 extern struct obj_section
*find_pc_overlay (CORE_ADDR
);
307 /* Return true if the section is an overlay. */
308 extern int section_is_overlay (struct obj_section
*);
310 /* Return true if the overlay section is currently "mapped". */
311 extern int section_is_mapped (struct obj_section
*);
313 /* Return true if pc belongs to section's VMA. */
314 extern bool pc_in_mapped_range (CORE_ADDR
, struct obj_section
*);
316 /* Return true if pc belongs to section's LMA. */
317 extern bool pc_in_unmapped_range (CORE_ADDR
, struct obj_section
*);
319 /* Map an address from a section's LMA to its VMA. */
320 extern CORE_ADDR
overlay_mapped_address (CORE_ADDR
, struct obj_section
*);
322 /* Map an address from a section's VMA to its LMA. */
323 extern CORE_ADDR
overlay_unmapped_address (CORE_ADDR
, struct obj_section
*);
325 /* Convert an address in an overlay section (force into VMA range). */
326 extern CORE_ADDR
symbol_overlayed_address (CORE_ADDR
, struct obj_section
*);
328 /* Load symbols from a file. */
329 extern void symbol_file_add_main (const char *args
,
330 symfile_add_flags add_flags
);
332 /* Clear GDB symbol tables. */
333 extern void symbol_file_clear (int from_tty
);
335 /* Default overlay update function. */
336 extern void simple_overlay_update (struct obj_section
*);
338 extern bfd_byte
*symfile_relocate_debug_section (struct objfile
*, asection
*,
341 extern int symfile_map_offsets_to_segments (bfd
*,
342 const struct symfile_segment_data
*,
344 int, const CORE_ADDR
*);
345 symfile_segment_data_up
get_symfile_segment_data (bfd
*abfd
);
347 extern scoped_restore_tmpl
<int> increment_reading_symtab (void);
349 bool expand_symtabs_matching
350 (gdb::function_view
<expand_symtabs_file_matcher_ftype
> file_matcher
,
351 const lookup_name_info
&lookup_name
,
352 gdb::function_view
<expand_symtabs_symbol_matcher_ftype
> symbol_matcher
,
353 gdb::function_view
<expand_symtabs_exp_notify_ftype
> expansion_notify
,
354 block_search_flags search_flags
,
355 domain_search_flags kind
);
357 void map_symbol_filenames (gdb::function_view
<symbol_filename_ftype
> fun
,
360 /* Target-agnostic function to load the sections of an executable into memory.
362 ARGS should be in the form "EXECUTABLE [OFFSET]", where OFFSET is an
363 optional offset to apply to each section. */
364 extern void generic_load (const char *args
, int from_tty
);
366 /* From minidebug.c. */
368 extern gdb_bfd_ref_ptr
find_separate_debug_file_in_section (struct objfile
*);
370 /* True if we are printing debug output about separate debug info files. */
372 extern bool separate_debug_file_debug
;
374 /* Read full symbols immediately. */
376 extern int readnow_symbol_files
;
378 /* Never read full symbols. */
380 extern int readnever_symbol_files
;
382 /* This is the symbol-file command. Read the file, analyze its
383 symbols, and add a struct symtab to a symtab list. The syntax of
384 the command is rather bizarre:
386 1. The function buildargv implements various quoting conventions
387 which are undocumented and have little or nothing in common with
388 the way things are quoted (or not quoted) elsewhere in GDB.
390 2. Options are used, which are not generally used in GDB (perhaps
391 "set mapped on", "set readnow on" would be better)
393 3. The order of options matters, which is contrary to GNU
394 conventions (because it is confusing and inconvenient). */
396 extern void symbol_file_command (const char *, int);
398 #endif /* !defined(SYMFILE_H) */