gdb/minsyms.h

   1 /* Minimal symbol table definitions for GDB.
   2
   3    Copyright (C) 2011-2014 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 3 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, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef MINSYMS_H
  21 #define MINSYMS_H
  22
  23 /* Several lookup functions return both a minimal symbol and the
  24    objfile in which it is found.  This structure is used in these
  25    cases.  */
  26
  27 struct bound_minimal_symbol
  28 {
  29   /* The minimal symbol that was found, or NULL if no minimal symbol
  30      was found.  */
  31
  32   struct minimal_symbol *minsym;
  33
  34   /* If MINSYM is not NULL, then this is the objfile in which the
  35      symbol is defined.  */
  36
  37   struct objfile *objfile;
  38 };
  39
  40 /* This header declares most of the API for dealing with minimal
  41    symbols and minimal symbol tables.  A few things are declared
  42    elsewhere; see below.
  43
  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.
  47
  48    For the definition of the minimal symbol structure, see struct
  49    minimal_symbol in symtab.h.
  50
  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.
  54 */
  55
  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.  */
  60
  61 void init_minimal_symbol_collection (void);
  62
  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.  */
  69
  70 struct cleanup *make_cleanup_discard_minimal_symbols (void);
  71
  72 /* Record a new minimal symbol.  This is the "full" entry point;
  73    simpler convenience entry points are also provided below.
  74
  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.
  80
  81    Arguments are:
  82
  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.  */
  93
  94 struct minimal_symbol *prim_record_minimal_symbol_full
  95     (const char *name,
  96      int name_len,
  97      int copy_name,
  98      CORE_ADDR address,
  99      enum minimal_symbol_type ms_type,
 100      int section,
 101      struct objfile *objfile);
 102
 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
 107
 108    This variant does not return the new symbol.  */
 109
 110 void prim_record_minimal_symbol (const char *, CORE_ADDR,
 111                                  enum minimal_symbol_type,
 112                                  struct objfile *);
 113
 114 /* Like prim_record_minimal_symbol_full, but:
 115    - uses strlen to compute NAME_LEN,
 116    - passes COPY_NAME = 0.  */
 117
 118 struct minimal_symbol *prim_record_minimal_symbol_and_info
 119     (const char *,
 120      CORE_ADDR,
 121      enum minimal_symbol_type,
 122      int section,
 123      struct objfile *);
 124
 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.  */
 129
 130 void install_minimal_symbols (struct objfile *);
 131
 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].  */
 136
 137 void terminate_minimal_symbol_table (struct objfile *objfile);
 138
 139 /* Sort all the minimal symbols in OBJFILE.  This should be only be
 140    called after relocating symbols; it ensures that the minimal
 141    symbols are properly sorted by address.  */
 142
 143 void msymbols_sort (struct objfile *objfile);
 144
 145 \f
 146
 147 /* Compute a hash code for the string argument.  */
 148
 149 unsigned int msymbol_hash (const char *);
 150
 151 /* Like msymbol_hash, but compute a hash code that is compatible with
 152    strcmp_iw.  */
 153
 154 unsigned int msymbol_hash_iw (const char *);
 155
 156 /* Compute the next hash value from previous HASH and the character C.  This
 157    is only a GDB in-memory computed value with no external files compatibility
 158    requirements.  */
 159
 160 #define SYMBOL_HASH_NEXT(hash, c)                       \
 161   ((hash) * 67 + tolower ((unsigned char) (c)) - 113)
 162
 163 \f
 164
 165 /* Look through all the current minimal symbol tables and find the
 166    first minimal symbol that matches NAME.  If OBJF is non-NULL, limit
 167    the search to that objfile.  If SFILE is non-NULL, the only file-scope
 168    symbols considered will be from that source file (global symbols are
 169    still preferred).  Returns a pointer to the minimal symbol that
 170    matches, or NULL if no match is found.  */
 171
 172 struct minimal_symbol *lookup_minimal_symbol (const char *,
 173                                               const char *,
 174                                               struct objfile *);
 175
 176 /* Like lookup_minimal_symbol, but searches all files and objfiles
 177    and returns a bound minimal symbol.  */
 178
 179 struct bound_minimal_symbol lookup_bound_minimal_symbol (const char *);
 180
 181 /* Find the minimal symbol named NAME, and return both the minsym
 182    struct and its objfile.  This only checks the linkage name.  */
 183
 184 struct bound_minimal_symbol lookup_minimal_symbol_and_objfile (const char *);
 185
 186 /* Look through all the current minimal symbol tables and find the
 187    first minimal symbol that matches NAME and has text type.  If OBJF
 188    is non-NULL, limit the search to that objfile.  Returns a pointer
 189    to the minimal symbol that matches, or NULL if no match is found.
 190
 191    This function only searches the mangled (linkage) names.  */
 192
 193 struct minimal_symbol *lookup_minimal_symbol_text (const char *,
 194                                                    struct objfile *);
 195
 196 /* Look through all the current minimal symbol tables and find the
 197    first minimal symbol that matches NAME and is a solib trampoline.
 198    If OBJF is non-NULL, limit the search to that objfile.  Returns a
 199    pointer to the minimal symbol that matches, or NULL if no match is
 200    found.
 201
 202    This function only searches the mangled (linkage) names.  */
 203
 204 struct minimal_symbol *lookup_minimal_symbol_solib_trampoline
 205     (const char *,
 206      struct objfile *);
 207
 208 /* Look through all the current minimal symbol tables and find the
 209    first minimal symbol that matches NAME and PC.  If OBJF is non-NULL,
 210    limit the search to that objfile.  Returns a pointer to the minimal
 211    symbol that matches, or NULL if no match is found.  */
 212
 213 struct minimal_symbol *lookup_minimal_symbol_by_pc_name
 214     (CORE_ADDR, const char *, struct objfile *);
 215
 216 /* Search through the minimal symbol table for each objfile and find
 217    the symbol whose address is the largest address that is still less
 218    than or equal to PC, and which matches SECTION.
 219
 220    If SECTION is NULL, this uses the result of find_pc_section
 221    instead.
 222
 223    The result has a non-NULL 'minsym' member if such a symbol is
 224    found, or NULL if PC is not in a suitable range.  */
 225
 226 struct bound_minimal_symbol lookup_minimal_symbol_by_pc_section
 227     (CORE_ADDR,
 228      struct obj_section *);
 229
 230 /* Backward compatibility: search through the minimal symbol table
 231    for a matching PC (no section given).
 232
 233    This is a wrapper that calls lookup_minimal_symbol_by_pc_section
 234    with a NULL section argument.  */
 235
 236 struct bound_minimal_symbol lookup_minimal_symbol_by_pc (CORE_ADDR);
 237
 238 /* Iterate over all the minimal symbols in the objfile OBJF which
 239    match NAME.  Both the ordinary and demangled names of each symbol
 240    are considered.  The caller is responsible for canonicalizing NAME,
 241    should that need to be done.
 242
 243    For each matching symbol, CALLBACK is called with the symbol and
 244    USER_DATA as arguments.  */
 245
 246 void iterate_over_minimal_symbols (struct objfile *objf,
 247                                    const char *name,
 248                                    void (*callback) (struct minimal_symbol *,
 249                                                      void *),
 250                                    void *user_data);
 251
 252 /* Compute the upper bound of MINSYM.  The upper bound is the last
 253    address thought to be part of the symbol.  If the symbol has a
 254    size, it is used.  Otherwise use the lesser of the next minimal
 255    symbol in the same section, or the end of the section, as the end
 256    of the function.  */
 257
 258 CORE_ADDR minimal_symbol_upper_bound (struct bound_minimal_symbol minsym);
 259
 260 #endif /* MINSYMS_H */