1 /* Minimal symbol table definitions for GDB.
3 Copyright (C) 2011-2014 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/>. */
23 /* Several lookup functions return both a minimal symbol and the
24 objfile in which it is found. This structure is used in these
27 struct bound_minimal_symbol
29 /* The minimal symbol that was found, or NULL if no minimal symbol
32 struct minimal_symbol *minsym;
34 /* If MINSYM is not NULL, then this is the objfile in which the
37 struct objfile *objfile;
40 /* This header declares most of the API for dealing with minimal
41 symbols and minimal symbol tables. A few things are declared
44 A minimal symbol is a symbol for which there is no direct debug
45 information. For example, for an ELF binary, minimal symbols are
46 created from the ELF symbol table.
48 For the definition of the minimal symbol structure, see struct
49 minimal_symbol in symtab.h.
51 Minimal symbols are stored in tables attached to an objfile; see
52 objfiles.h for details. Code should generally treat these tables
53 as opaque and use functions provided by minsyms.c to inspect them.
56 /* Prepare to start collecting minimal symbols. This should be called
57 by a symbol reader to initialize the minimal symbol module.
58 Currently, minimal symbol table creation is not reentrant; it
59 relies on global (static) variables in minsyms.c. */
61 void init_minimal_symbol_collection (void);
63 /* Return a cleanup which is used to clean up the global state left
64 over by minimal symbol creation. After calling
65 init_minimal_symbol_collection, a symbol reader should call this
66 function. Then, after all minimal symbols have been read,
67 regardless of whether they are installed or not, the cleanup
68 returned by this function should be run. */
70 struct cleanup *make_cleanup_discard_minimal_symbols (void);
72 /* Record a new minimal symbol. This is the "full" entry point;
73 simpler convenience entry points are also provided below.
75 This returns a new minimal symbol. It is ok to modify the returned
76 minimal symbol (though generally not necessary). It is not ok,
77 though, to stash the pointer anywhere; as minimal symbols may be
78 moved after creation. The memory for the returned minimal symbol
79 is still owned by the minsyms.c code, and should not be freed.
83 NAME - the symbol's name
84 NAME_LEN - the length of the name
85 COPY_NAME - if true, the minsym code must make a copy of NAME. If
86 false, then NAME must be NUL-terminated, and must have a lifetime
87 that is at least as long as OBJFILE's lifetime.
88 ADDRESS - the address of the symbol
89 MS_TYPE - the type of the symbol
90 SECTION - the symbol's section
91 appropriate obj_section for the minimal symbol. This can be NULL.
92 OBJFILE - the objfile associated with the minimal symbol. */
94 struct minimal_symbol *prim_record_minimal_symbol_full
99 enum minimal_symbol_type ms_type,
101 struct objfile *objfile);
103 /* Like prim_record_minimal_symbol_full, but:
104 - uses strlen to compute NAME_LEN,
105 - passes COPY_NAME = 0,
106 - and passes a default SECTION, depending on the type
108 This variant does not return the new symbol. */
110 void prim_record_minimal_symbol (const char *, CORE_ADDR,
111 enum minimal_symbol_type,
114 /* Like prim_record_minimal_symbol_full, but:
115 - uses strlen to compute NAME_LEN,
116 - passes COPY_NAME = 0. */
118 struct minimal_symbol *prim_record_minimal_symbol_and_info
121 enum minimal_symbol_type,
125 /* Install the minimal symbols that have been collected into the given
126 objfile. After this is called, the cleanup returned by
127 make_cleanup_discard_minimal_symbols should be run in order to
128 clean up global state. */
130 void install_minimal_symbols (struct objfile *);
132 /* Create the terminating entry of OBJFILE's minimal symbol table.
133 If OBJFILE->msymbols is zero, allocate a single entry from
134 OBJFILE->objfile_obstack; otherwise, just initialize
135 OBJFILE->msymbols[OBJFILE->minimal_symbol_count]. */
137 void terminate_minimal_symbol_table (struct objfile *objfile);
141 /* Compute a hash code for the string argument. */
143 unsigned int msymbol_hash (const char *);
145 /* Like msymbol_hash, but compute a hash code that is compatible with
148 unsigned int msymbol_hash_iw (const char *);
150 /* Compute the next hash value from previous HASH and the character C. This
151 is only a GDB in-memory computed value with no external files compatibility
154 #define SYMBOL_HASH_NEXT(hash, c) \
155 ((hash) * 67 + tolower ((unsigned char) (c)) - 113)
159 /* Look through all the current minimal symbol tables and find the
160 first minimal symbol that matches NAME. If OBJF is non-NULL, limit
161 the search to that objfile. If SFILE is non-NULL, the only
162 file-scope symbols considered will be from that source file (global
163 symbols are still preferred). Returns a bound minimal symbol that
164 matches, or an empty bound minimal symbol if no match is found. */
166 struct bound_minimal_symbol lookup_minimal_symbol (const char *,
170 /* Like lookup_minimal_symbol, but searches all files and
173 struct bound_minimal_symbol lookup_bound_minimal_symbol (const char *);
175 /* Find the minimal symbol named NAME, and return both the minsym
176 struct and its objfile. This only checks the linkage name. */
178 struct bound_minimal_symbol lookup_minimal_symbol_and_objfile (const char *);
180 /* Look through all the current minimal symbol tables and find the
181 first minimal symbol that matches NAME and has text type. If OBJF
182 is non-NULL, limit the search to that objfile. Returns a bound
183 minimal symbol that matches, or an "empty" bound minimal symbol
186 This function only searches the mangled (linkage) names. */
188 struct bound_minimal_symbol lookup_minimal_symbol_text (const char *,
191 /* Look through all the current minimal symbol tables and find the
192 first minimal symbol that matches NAME and is a solib trampoline.
193 If OBJF is non-NULL, limit the search to that objfile. Returns a
194 pointer to the minimal symbol that matches, or NULL if no match is
197 This function only searches the mangled (linkage) names. */
199 struct bound_minimal_symbol lookup_minimal_symbol_solib_trampoline
203 /* Look through all the current minimal symbol tables and find the
204 first minimal symbol that matches NAME and PC. If OBJF is non-NULL,
205 limit the search to that objfile. Returns a pointer to the minimal
206 symbol that matches, or NULL if no match is found. */
208 struct minimal_symbol *lookup_minimal_symbol_by_pc_name
209 (CORE_ADDR, const char *, struct objfile *);
211 /* Search through the minimal symbol table for each objfile and find
212 the symbol whose address is the largest address that is still less
213 than or equal to PC, and which matches SECTION.
215 If SECTION is NULL, this uses the result of find_pc_section
218 The result has a non-NULL 'minsym' member if such a symbol is
219 found, or NULL if PC is not in a suitable range. */
221 struct bound_minimal_symbol lookup_minimal_symbol_by_pc_section
223 struct obj_section *);
225 /* Backward compatibility: search through the minimal symbol table
226 for a matching PC (no section given).
228 This is a wrapper that calls lookup_minimal_symbol_by_pc_section
229 with a NULL section argument. */
231 struct bound_minimal_symbol lookup_minimal_symbol_by_pc (CORE_ADDR);
233 /* Iterate over all the minimal symbols in the objfile OBJF which
234 match NAME. Both the ordinary and demangled names of each symbol
235 are considered. The caller is responsible for canonicalizing NAME,
236 should that need to be done.
238 For each matching symbol, CALLBACK is called with the symbol and
239 USER_DATA as arguments. */
241 void iterate_over_minimal_symbols (struct objfile *objf,
243 void (*callback) (struct minimal_symbol *,
247 /* Compute the upper bound of MINSYM. The upper bound is the last
248 address thought to be part of the symbol. If the symbol has a
249 size, it is used. Otherwise use the lesser of the next minimal
250 symbol in the same section, or the end of the section, as the end
253 CORE_ADDR minimal_symbol_upper_bound (struct bound_minimal_symbol minsym);
255 #endif /* MINSYMS_H */