gdb/quick-symbol.h

   1 /* "Quick" symbol functions
   2
   3    Copyright (C) 2021-2022 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 GDB_QUICK_SYMBOL_H
  21 #define GDB_QUICK_SYMBOL_H
  22
  23 /* Like block_enum, but used as flags to pass to lookup functions.  */
  24
  25 enum block_search_flag_values
  26 {
  27   SEARCH_GLOBAL_BLOCK = 1,
  28   SEARCH_STATIC_BLOCK = 2
  29 };
  30
  31 DEF_ENUM_FLAGS_TYPE (enum block_search_flag_values, block_search_flags);
  32
  33 /* Comparison function for symbol look ups.  */
  34
  35 typedef int (symbol_compare_ftype) (const char *string1,
  36                                     const char *string2);
  37
  38 /* Callback for quick_symbol_functions->map_symbol_filenames.  */
  39
  40 typedef void (symbol_filename_ftype) (const char *filename,
  41                                       const char *fullname);
  42
  43 /* Callback for quick_symbol_functions->expand_symtabs_matching
  44    to match a file name.  */
  45
  46 typedef bool (expand_symtabs_file_matcher_ftype) (const char *filename,
  47                                                   bool basenames);
  48
  49 /* Callback for quick_symbol_functions->expand_symtabs_matching
  50    to match a symbol name.  */
  51
  52 typedef bool (expand_symtabs_symbol_matcher_ftype) (const char *name);
  53
  54 /* Callback for quick_symbol_functions->expand_symtabs_matching
  55    to be called after a symtab has been expanded.  If this returns
  56    true, more symtabs are checked; if it returns false, iteration
  57    stops.  */
  58
  59 typedef bool (expand_symtabs_exp_notify_ftype) (compunit_symtab *symtab);
  60
  61 /* The "quick" symbol functions exist so that symbol readers can
  62    avoiding an initial read of all the symbols.  For example, symbol
  63    readers might choose to use the "partial symbol table" utilities,
  64    which is one implementation of the quick symbol functions.
  65
  66    The quick symbol functions are generally opaque: the underlying
  67    representation is hidden from the caller.
  68
  69    In general, these functions should only look at whatever special
  70    index the symbol reader creates -- looking through the symbol
  71    tables themselves is handled by generic code.  If a function is
  72    defined as returning a "symbol table", this means that the function
  73    should only return a newly-created symbol table; it should not
  74    examine pre-existing ones.
  75
  76    The exact list of functions here was determined in an ad hoc way
  77    based on gdb's history.  */
  78
  79 struct quick_symbol_functions
  80 {
  81   virtual ~quick_symbol_functions ()
  82   {
  83   }
  84
  85   /* Return true if this objfile has any "partial" symbols
  86      available.  */
  87   virtual bool has_symbols (struct objfile *objfile) = 0;
  88
  89   /* Return true if OBJFILE has any unexpanded symtabs.  A return value of
  90      false indicates there are no unexpanded symtabs, this might mean that
  91      all of the symtabs have been expanded (full debug has been read in),
  92      or it might been that OBJFILE has no debug information.  */
  93   virtual bool has_unexpanded_symtabs (struct objfile *objfile) = 0;
  94
  95   /* Return the symbol table for the "last" file appearing in
  96      OBJFILE.  */
  97   virtual struct symtab *find_last_source_symtab (struct objfile *objfile) = 0;
  98
  99   /* Forget all cached full file names for OBJFILE.  */
 100   virtual void forget_cached_source_info (struct objfile *objfile) = 0;
 101
 102   /* Check to see if the global symbol is defined in a "partial" symbol table
 103      of OBJFILE. NAME is the name of the symbol to look for.  DOMAIN
 104      indicates what sort of symbol to search for.
 105
 106      If found, sets *symbol_found_p to true and returns the symbol language.
 107      defined, or NULL if no such symbol table exists.  */
 108   virtual enum language lookup_global_symbol_language
 109        (struct objfile *objfile,
 110         const char *name,
 111         domain_enum domain,
 112         bool *symbol_found_p) = 0;
 113
 114   /* Print statistics about any indices loaded for OBJFILE.  The
 115      statistics should be printed to gdb_stdout.  This is used for
 116      "maint print statistics".  Statistics are printed in two
 117      sections.  PRINT_BCACHE is false when printing the first section
 118      of general statistics, and true when printing bcache statistics.  */
 119   virtual void print_stats (struct objfile *objfile, bool print_bcache) = 0;
 120
 121   /* Dump any indices loaded for OBJFILE.  The dump should go to
 122      gdb_stdout.  This is used for "maint print objfiles".  */
 123   virtual void dump (struct objfile *objfile) = 0;
 124
 125   /* Read all symbol tables associated with OBJFILE.  */
 126   virtual void expand_all_symtabs (struct objfile *objfile) = 0;
 127
 128   /* Find global or static symbols in all tables that are in DOMAIN
 129      and for which MATCH (symbol name, NAME) == 0, reading in partial
 130      symbol tables as needed.  Look through global symbols if GLOBAL
 131      and otherwise static symbols.
 132
 133      MATCH must be weaker than strcmp_iw_ordered in the sense that
 134      strcmp_iw_ordered(x,y) == 0 --> MATCH(x,y) == 0.  ORDERED_COMPARE,
 135      if non-null, must be an ordering relation compatible with
 136      strcmp_iw_ordered in the sense that
 137             strcmp_iw_ordered(x,y) == 0 --> ORDERED_COMPARE(x,y) == 0
 138      and
 139             strcmp_iw_ordered(x,y) <= 0 --> ORDERED_COMPARE(x,y) <= 0
 140      (allowing strcmp_iw_ordered(x,y) < 0 while ORDERED_COMPARE(x, y) == 0).
 141   */
 142
 143   virtual void expand_matching_symbols
 144     (struct objfile *,
 145      const lookup_name_info &lookup_name,
 146      domain_enum domain,
 147      int global,
 148      symbol_compare_ftype *ordered_compare) = 0;
 149
 150   /* Expand all symbol tables in OBJFILE matching some criteria.
 151
 152      FILE_MATCHER is called for each file in OBJFILE.  The file name
 153      is passed to it.  If the matcher returns false, the file is
 154      skipped.  If FILE_MATCHER is NULL the file is not skipped.  If
 155      BASENAMES is true the matcher should consider only file base
 156      names (the passed file name is already only the lbasename'd
 157      part).
 158
 159      If the file is not skipped, and SYMBOL_MATCHER and LOOKUP_NAME are NULL,
 160      the symbol table is expanded.
 161
 162      Otherwise, individual symbols are considered.
 163
 164      If DOMAIN or KIND do not match, the symbol is skipped.
 165      If DOMAIN is UNDEF_DOMAIN, that is treated as a wildcard.
 166
 167      If the symbol name does not match LOOKUP_NAME, the symbol is skipped.
 168
 169      If SYMBOL_MATCHER returns false, then the symbol is skipped.
 170      Note that if SYMBOL_MATCHER is non-NULL, then LOOKUP_NAME must
 171      also be provided.
 172
 173      Otherwise, the symbol's symbol table is expanded and the
 174      notification function is called.  If the notification function
 175      returns false, execution stops and this method returns false.
 176      Otherwise, more files are considered.  This method will return
 177      true if all calls to the notification function return true.  */
 178   virtual bool expand_symtabs_matching
 179     (struct objfile *objfile,
 180      gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
 181      const lookup_name_info *lookup_name,
 182      gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
 183      gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
 184      block_search_flags search_flags,
 185      domain_enum domain,
 186      enum search_domain kind) = 0;
 187
 188   /* Return the comp unit from OBJFILE that contains PC and
 189      SECTION.  Return NULL if there is no such compunit.  This
 190      should return the compunit that contains a symbol whose
 191      address exactly matches PC, or, if there is no exact match, the
 192      compunit that contains a symbol whose address is closest to
 193      PC.  */
 194   virtual struct compunit_symtab *find_pc_sect_compunit_symtab
 195     (struct objfile *objfile, struct bound_minimal_symbol msymbol,
 196      CORE_ADDR pc, struct obj_section *section, int warn_if_readin) = 0;
 197
 198   /* Return the comp unit from OBJFILE that contains a symbol at
 199      ADDRESS.  Return NULL if there is no such comp unit.  Unlike
 200      find_pc_sect_compunit_symtab, any sort of symbol (not just text
 201      symbols) can be considered, and only exact address matches are
 202      considered.  */
 203   virtual struct compunit_symtab *find_compunit_symtab_by_address
 204     (struct objfile *objfile, CORE_ADDR address) = 0;
 205
 206   /* Call a callback for every file defined in OBJFILE whose symtab is
 207      not already read in.  FUN is the callback.  It is passed the
 208      file's FILENAME and the file's FULLNAME (if need_fullname is
 209      non-zero).  */
 210   virtual void map_symbol_filenames
 211        (struct objfile *objfile,
 212         gdb::function_view<symbol_filename_ftype> fun,
 213         bool need_fullname) = 0;
 214
 215   /* This is called when the objfile is relocated.  It can be used to
 216      clean up any internal caches.  */
 217   virtual void relocated ()
 218   {
 219     /* Do nothing.  */
 220   }
 221
 222   /* Return true if this class can lazily read the symbols.  This may
 223      only return true if there are in fact symbols to be read, because
 224      this is used in the implementation of 'has_partial_symbols'.  */
 225   virtual bool can_lazily_read_symbols ()
 226   {
 227     return false;
 228   }
 229
 230   /* Read the partial symbols for OBJFILE.  This will only ever be
 231      called if can_lazily_read_symbols returns true.  */
 232   virtual void read_partial_symbols (struct objfile *objfile)
 233   {
 234   }
 235 };
 236
 237 typedef std::unique_ptr<quick_symbol_functions> quick_symbol_functions_up;
 238
 239 #endif /* GDB_QUICK_SYMBOL_H */