gdb/minsyms.h

   1 /* Minimal symbol table definitions for GDB.
   2
   3    Copyright (C) 2011-2016 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 = 1,
 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 = 1.  */
 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 \f
 140
 141 /* Compute a hash code for the string argument.  */
 142
 143 unsigned int msymbol_hash (const char *);
 144
 145 /* Like msymbol_hash, but compute a hash code that is compatible with
 146    strcmp_iw.  */
 147
 148 unsigned int msymbol_hash_iw (const char *);
 149
 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
 152    requirements.  */
 153
 154 #define SYMBOL_HASH_NEXT(hash, c)                       \
 155   ((hash) * 67 + tolower ((unsigned char) (c)) - 113)
 156
 157 \f
 158
 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.  */
 165
 166 struct bound_minimal_symbol lookup_minimal_symbol (const char *,
 167                                                    const char *,
 168                                                    struct objfile *);
 169
 170 /* Like lookup_minimal_symbol, but searches all files and
 171    objfiles.  */
 172
 173 struct bound_minimal_symbol lookup_bound_minimal_symbol (const char *);
 174
 175 /* Find the minimal symbol named NAME, and return both the minsym
 176    struct and its objfile.  This only checks the linkage name.  */
 177
 178 struct bound_minimal_symbol lookup_minimal_symbol_and_objfile (const char *);
 179
 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
 184    otherwise.
 185
 186    This function only searches the mangled (linkage) names.  */
 187
 188 struct bound_minimal_symbol lookup_minimal_symbol_text (const char *,
 189                                                         struct objfile *);
 190
 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
 195    found.
 196
 197    This function only searches the mangled (linkage) names.  */
 198
 199 struct bound_minimal_symbol lookup_minimal_symbol_solib_trampoline
 200     (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 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.  */
 207
 208 struct minimal_symbol *lookup_minimal_symbol_by_pc_name
 209     (CORE_ADDR, const char *, struct objfile *);
 210
 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.
 214
 215    If SECTION is NULL, this uses the result of find_pc_section
 216    instead.
 217
 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.  */
 220
 221 struct bound_minimal_symbol lookup_minimal_symbol_by_pc_section
 222     (CORE_ADDR,
 223      struct obj_section *);
 224
 225 /* Backward compatibility: search through the minimal symbol table
 226    for a matching PC (no section given).
 227
 228    This is a wrapper that calls lookup_minimal_symbol_by_pc_section
 229    with a NULL section argument.  */
 230
 231 struct bound_minimal_symbol lookup_minimal_symbol_by_pc (CORE_ADDR);
 232
 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.
 237
 238    For each matching symbol, CALLBACK is called with the symbol and
 239    USER_DATA as arguments.  */
 240
 241 void iterate_over_minimal_symbols (struct objfile *objf,
 242                                    const char *name,
 243                                    void (*callback) (struct minimal_symbol *,
 244                                                      void *),
 245                                    void *user_data);
 246
 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
 251    of the function.  */
 252
 253 CORE_ADDR minimal_symbol_upper_bound (struct bound_minimal_symbol minsym);
 254
 255 #endif /* MINSYMS_H */