gdb/minsyms.h

   1 /* Minimal symbol table definitions for GDB.
   2
   3    Copyright (C) 2011-2013 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    BFD_SECTION - the symbol's BFD section; used to find the
  92    appropriate obj_section for the minimal symbol.  This can be NULL.
  93    OBJFILE - the objfile associated with the minimal symbol.  */
  94
  95 struct minimal_symbol *prim_record_minimal_symbol_full
  96     (const char *name,
  97      int name_len,
  98      int copy_name,
  99      CORE_ADDR address,
 100      enum minimal_symbol_type ms_type,
 101      int section,
 102      asection *bfd_section,
 103      struct objfile *objfile);
 104
 105 /* Like prim_record_minimal_symbol_full, but:
 106    - uses strlen to compute NAME_LEN,
 107    - passes COPY_NAME = 0,
 108    - passes SECTION = 0,
 109    - and passes BFD_SECTION = NULL.
 110
 111    This variant does not return the new symbol.  */
 112
 113 void prim_record_minimal_symbol (const char *, CORE_ADDR,
 114                                  enum minimal_symbol_type,
 115                                  struct objfile *);
 116
 117 /* Like prim_record_minimal_symbol_full, but:
 118    - uses strlen to compute NAME_LEN,
 119    - passes COPY_NAME = 0.  */
 120
 121 struct minimal_symbol *prim_record_minimal_symbol_and_info
 122     (const char *,
 123      CORE_ADDR,
 124      enum minimal_symbol_type,
 125      int section,
 126      asection *bfd_section,
 127      struct objfile *);
 128
 129 /* Install the minimal symbols that have been collected into the given
 130    objfile.  After this is called, the cleanup returned by
 131    make_cleanup_discard_minimal_symbols should be run in order to
 132    clean up global state.  */
 133
 134 void install_minimal_symbols (struct objfile *);
 135
 136 /* Create the terminating entry of OBJFILE's minimal symbol table.
 137    If OBJFILE->msymbols is zero, allocate a single entry from
 138    OBJFILE->objfile_obstack; otherwise, just initialize
 139    OBJFILE->msymbols[OBJFILE->minimal_symbol_count].  */
 140
 141 void terminate_minimal_symbol_table (struct objfile *objfile);
 142
 143 /* Sort all the minimal symbols in OBJFILE.  This should be only be
 144    called after relocating symbols; it ensures that the minimal
 145    symbols are properly sorted by address.  */
 146
 147 void msymbols_sort (struct objfile *objfile);
 148
 149 \f
 150
 151 /* Compute a hash code for the string argument.  */
 152
 153 unsigned int msymbol_hash (const char *);
 154
 155 /* Like msymbol_hash, but compute a hash code that is compatible with
 156    strcmp_iw.  */
 157
 158 unsigned int msymbol_hash_iw (const char *);
 159
 160 /* Compute the next hash value from previous HASH and the character C.  This
 161    is only a GDB in-memory computed value with no external files compatibility
 162    requirements.  */
 163
 164 #define SYMBOL_HASH_NEXT(hash, c)                       \
 165   ((hash) * 67 + tolower ((unsigned char) (c)) - 113)
 166
 167 \f
 168
 169 /* Return the objfile that holds the minimal symbol SYM.  Every
 170    minimal symbols is held by some objfile; this will never return
 171    NULL.  */
 172
 173 struct objfile *msymbol_objfile (struct minimal_symbol *sym);
 174
 175 \f
 176
 177 /* Look through all the current minimal symbol tables and find the
 178    first minimal symbol that matches NAME.  If OBJF is non-NULL, limit
 179    the search to that objfile.  If SFILE is non-NULL, the only file-scope
 180    symbols considered will be from that source file (global symbols are
 181    still preferred).  Returns a pointer to the minimal symbol that
 182    matches, or NULL if no match is found.  */
 183
 184 struct minimal_symbol *lookup_minimal_symbol (const char *,
 185                                               const char *,
 186                                               struct objfile *);
 187
 188 /* Find the minimal symbol named NAME, and return both the minsym
 189    struct and its objfile.  This only checks the linkage name.  */
 190
 191 struct bound_minimal_symbol lookup_minimal_symbol_and_objfile (const char *);
 192
 193 /* Look through all the current minimal symbol tables and find the
 194    first minimal symbol that matches NAME and has text type.  If OBJF
 195    is non-NULL, limit the search to that objfile.  Returns a pointer
 196    to the minimal symbol that matches, or NULL if no match is found.
 197
 198    This function only searches the mangled (linkage) names.  */
 199
 200 struct minimal_symbol *lookup_minimal_symbol_text (const char *,
 201                                                    struct objfile *);
 202
 203 /* Look through all the current minimal symbol tables and find the
 204    first minimal symbol that matches NAME and is a solib trampoline.
 205    If OBJF is non-NULL, limit the search to that objfile.  Returns a
 206    pointer to the minimal symbol that matches, or NULL if no match is
 207    found.
 208
 209    This function only searches the mangled (linkage) names.  */
 210
 211 struct minimal_symbol *lookup_minimal_symbol_solib_trampoline
 212     (const char *,
 213      struct objfile *);
 214
 215 /* Look through all the current minimal symbol tables and find the
 216    first minimal symbol that matches NAME and PC.  If OBJF is non-NULL,
 217    limit the search to that objfile.  Returns a pointer to the minimal
 218    symbol that matches, or NULL if no match is found.  */
 219
 220 struct minimal_symbol *lookup_minimal_symbol_by_pc_name
 221     (CORE_ADDR, const char *, struct objfile *);
 222
 223 /* Search through the minimal symbol table for each objfile and find
 224    the symbol whose address is the largest address that is still less
 225    than or equal to PC, and which matches SECTION.
 226
 227    If SECTION is NULL, this uses the result of find_pc_section
 228    instead.
 229
 230    The result has a non-NULL 'minsym' member if such a symbol is
 231    found, or NULL if PC is not in a suitable range.  */
 232
 233 struct bound_minimal_symbol lookup_minimal_symbol_by_pc_section
 234     (CORE_ADDR,
 235      struct obj_section *);
 236
 237 /* Backward compatibility: search through the minimal symbol table
 238    for a matching PC (no section given).
 239
 240    This is a wrapper that calls lookup_minimal_symbol_by_pc_section
 241    with a NULL section argument.  */
 242
 243 struct bound_minimal_symbol lookup_minimal_symbol_by_pc (CORE_ADDR);
 244
 245 /* Iterate over all the minimal symbols in the objfile OBJF which
 246    match NAME.  Both the ordinary and demangled names of each symbol
 247    are considered.  The caller is responsible for canonicalizing NAME,
 248    should that need to be done.
 249
 250    For each matching symbol, CALLBACK is called with the symbol and
 251    USER_DATA as arguments.  */
 252
 253 void iterate_over_minimal_symbols (struct objfile *objf,
 254                                    const char *name,
 255                                    void (*callback) (struct minimal_symbol *,
 256                                                      void *),
 257                                    void *user_data);
 258
 259 #endif /* MINSYMS_H */