gdb/block.h

   1 /* Code dealing with blocks for GDB.
   2
   3    Copyright (C) 2003-2015 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 BLOCK_H
  21 #define BLOCK_H
  22
  23 #include "dictionary.h"
  24
  25 /* Opaque declarations.  */
  26
  27 struct symbol;
  28 struct compunit_symtab;
  29 struct block_namespace_info;
  30 struct using_direct;
  31 struct obstack;
  32 struct addrmap;
  33
  34 /* All of the name-scope contours of the program
  35    are represented by `struct block' objects.
  36    All of these objects are pointed to by the blockvector.
  37
  38    Each block represents one name scope.
  39    Each lexical context has its own block.
  40
  41    The blockvector begins with some special blocks.
  42    The GLOBAL_BLOCK contains all the symbols defined in this compilation
  43    whose scope is the entire program linked together.
  44    The STATIC_BLOCK contains all the symbols whose scope is the
  45    entire compilation excluding other separate compilations.
  46    Blocks starting with the FIRST_LOCAL_BLOCK are not special.
  47
  48    Each block records a range of core addresses for the code that
  49    is in the scope of the block.  The STATIC_BLOCK and GLOBAL_BLOCK
  50    give, for the range of code, the entire range of code produced
  51    by the compilation that the symbol segment belongs to.
  52
  53    The blocks appear in the blockvector
  54    in order of increasing starting-address,
  55    and, within that, in order of decreasing ending-address.
  56
  57    This implies that within the body of one function
  58    the blocks appear in the order of a depth-first tree walk.  */
  59
  60 struct block
  61 {
  62
  63   /* Addresses in the executable code that are in this block.  */
  64
  65   CORE_ADDR startaddr;
  66   CORE_ADDR endaddr;
  67
  68   /* The symbol that names this block, if the block is the body of a
  69      function (real or inlined); otherwise, zero.  */
  70
  71   struct symbol *function;
  72
  73   /* The `struct block' for the containing block, or 0 if none.
  74
  75      The superblock of a top-level local block (i.e. a function in the
  76      case of C) is the STATIC_BLOCK.  The superblock of the
  77      STATIC_BLOCK is the GLOBAL_BLOCK.  */
  78
  79   struct block *superblock;
  80
  81   /* This is used to store the symbols in the block.  */
  82
  83   struct dictionary *dict;
  84
  85   /* Contains information about namespace-related info relevant to this block:
  86      using directives and the current namespace scope.  */
  87
  88   struct block_namespace_info *namespace_info;
  89 };
  90
  91 /* The global block is singled out so that we can provide a back-link
  92    to the compunit symtab.  */
  93
  94 struct global_block
  95 {
  96   /* The block.  */
  97
  98   struct block block;
  99
 100   /* This holds a pointer to the compunit symtab holding this block.  */
 101
 102   struct compunit_symtab *compunit_symtab;
 103 };
 104
 105 #define BLOCK_START(bl)         (bl)->startaddr
 106 #define BLOCK_END(bl)           (bl)->endaddr
 107 #define BLOCK_FUNCTION(bl)      (bl)->function
 108 #define BLOCK_SUPERBLOCK(bl)    (bl)->superblock
 109 #define BLOCK_DICT(bl)          (bl)->dict
 110 #define BLOCK_NAMESPACE(bl)     (bl)->namespace_info
 111
 112 struct blockvector
 113 {
 114   /* Number of blocks in the list.  */
 115   int nblocks;
 116   /* An address map mapping addresses to blocks in this blockvector.
 117      This pointer is zero if the blocks' start and end addresses are
 118      enough.  */
 119   struct addrmap *map;
 120   /* The blocks themselves.  */
 121   struct block *block[1];
 122 };
 123
 124 #define BLOCKVECTOR_NBLOCKS(blocklist) (blocklist)->nblocks
 125 #define BLOCKVECTOR_BLOCK(blocklist,n) (blocklist)->block[n]
 126 #define BLOCKVECTOR_MAP(blocklist) ((blocklist)->map)
 127
 128 /* Return the objfile of BLOCK, which must be non-NULL.  */
 129
 130 extern struct objfile *block_objfile (const struct block *block);
 131
 132 /* Return the architecture of BLOCK, which must be non-NULL.  */
 133
 134 extern struct gdbarch *block_gdbarch (const struct block *block);
 135
 136 extern struct symbol *block_linkage_function (const struct block *);
 137
 138 extern struct symbol *block_containing_function (const struct block *);
 139
 140 extern int block_inlined_p (const struct block *block);
 141
 142 extern int contained_in (const struct block *, const struct block *);
 143
 144 extern const struct blockvector *blockvector_for_pc (CORE_ADDR,
 145                                                const struct block **);
 146
 147 extern const struct blockvector *
 148   blockvector_for_pc_sect (CORE_ADDR, struct obj_section *,
 149                            const struct block **, struct compunit_symtab *);
 150
 151 extern int blockvector_contains_pc (const struct blockvector *bv, CORE_ADDR pc);
 152
 153 extern struct call_site *call_site_for_pc (struct gdbarch *gdbarch,
 154                                            CORE_ADDR pc);
 155
 156 extern const struct block *block_for_pc (CORE_ADDR);
 157
 158 extern const struct block *block_for_pc_sect (CORE_ADDR, struct obj_section *);
 159
 160 extern const char *block_scope (const struct block *block);
 161
 162 extern void block_set_scope (struct block *block, const char *scope,
 163                              struct obstack *obstack);
 164
 165 extern struct using_direct *block_using (const struct block *block);
 166
 167 extern void block_set_using (struct block *block,
 168                              struct using_direct *using_decl,
 169                              struct obstack *obstack);
 170
 171 extern const struct block *block_static_block (const struct block *block);
 172
 173 extern const struct block *block_global_block (const struct block *block);
 174
 175 extern struct block *allocate_block (struct obstack *obstack);
 176
 177 extern struct block *allocate_global_block (struct obstack *obstack);
 178
 179 extern void set_block_compunit_symtab (struct block *,
 180                                        struct compunit_symtab *);
 181
 182 /* A block iterator.  This structure should be treated as though it
 183    were opaque; it is only defined here because we want to support
 184    stack allocation of iterators.  */
 185
 186 struct block_iterator
 187 {
 188   /* If we're iterating over a single block, this holds the block.
 189      Otherwise, it holds the canonical compunit.  */
 190
 191   union
 192   {
 193     struct compunit_symtab *compunit_symtab;
 194     const struct block *block;
 195   } d;
 196
 197   /* If we're iterating over a single block, this is always -1.
 198      Otherwise, it holds the index of the current "included" symtab in
 199      the canonical symtab (that is, d.symtab->includes[idx]), with -1
 200      meaning the canonical symtab itself.  */
 201
 202   int idx;
 203
 204   /* Which block, either static or global, to iterate over.  If this
 205      is FIRST_LOCAL_BLOCK, then we are iterating over a single block.
 206      This is used to select which field of 'd' is in use.  */
 207
 208   enum block_enum which;
 209
 210   /* The underlying dictionary iterator.  */
 211
 212   struct dict_iterator dict_iter;
 213 };
 214
 215 /* Initialize ITERATOR to point at the first symbol in BLOCK, and
 216    return that first symbol, or NULL if BLOCK is empty.  */
 217
 218 extern struct symbol *block_iterator_first (const struct block *block,
 219                                             struct block_iterator *iterator);
 220
 221 /* Advance ITERATOR, and return the next symbol, or NULL if there are
 222    no more symbols.  Don't call this if you've previously received
 223    NULL from block_iterator_first or block_iterator_next on this
 224    iteration.  */
 225
 226 extern struct symbol *block_iterator_next (struct block_iterator *iterator);
 227
 228 /* Initialize ITERATOR to point at the first symbol in BLOCK whose
 229    SYMBOL_SEARCH_NAME is NAME (as tested using strcmp_iw), and return
 230    that first symbol, or NULL if there are no such symbols.  */
 231
 232 extern struct symbol *block_iter_name_first (const struct block *block,
 233                                              const char *name,
 234                                              struct block_iterator *iterator);
 235
 236 /* Advance ITERATOR to point at the next symbol in BLOCK whose
 237    SYMBOL_SEARCH_NAME is NAME (as tested using strcmp_iw), or NULL if
 238    there are no more such symbols.  Don't call this if you've
 239    previously received NULL from block_iterator_first or
 240    block_iterator_next on this iteration.  And don't call it unless
 241    ITERATOR was created by a previous call to block_iter_name_first
 242    with the same NAME.  */
 243
 244 extern struct symbol *block_iter_name_next (const char *name,
 245                                             struct block_iterator *iterator);
 246
 247 /* Initialize ITERATOR to point at the first symbol in BLOCK whose
 248    SYMBOL_SEARCH_NAME is NAME, as tested using COMPARE (which must use
 249    the same conventions as strcmp_iw and be compatible with any
 250    block hashing function), and return that first symbol, or NULL
 251    if there are no such symbols.  */
 252
 253 extern struct symbol *block_iter_match_first (const struct block *block,
 254                                               const char *name,
 255                                               symbol_compare_ftype *compare,
 256                                               struct block_iterator *iterator);
 257
 258 /* Advance ITERATOR to point at the next symbol in BLOCK whose
 259    SYMBOL_SEARCH_NAME is NAME, as tested using COMPARE (see
 260    block_iter_match_first), or NULL if there are no more such symbols.
 261    Don't call this if you've previously received NULL from
 262    block_iterator_match_first or block_iterator_match_next on this
 263    iteration.  And don't call it unless ITERATOR was created by a
 264    previous call to block_iter_match_first with the same NAME and COMPARE.  */
 265
 266 extern struct symbol *block_iter_match_next (const char *name,
 267                                              symbol_compare_ftype *compare,
 268                                              struct block_iterator *iterator);
 269
 270 /* Search BLOCK for symbol NAME in DOMAIN.  */
 271
 272 extern struct symbol *block_lookup_symbol (const struct block *block,
 273                                            const char *name,
 274                                            const domain_enum domain);
 275
 276 /* Search BLOCK for symbol NAME in DOMAIN but only in primary symbol table of
 277    BLOCK.  BLOCK must be STATIC_BLOCK or GLOBAL_BLOCK.  Function is useful if
 278    one iterates all global/static blocks of an objfile.  */
 279
 280 extern struct symbol *block_lookup_symbol_primary (const struct block *block,
 281                                                    const char *name,
 282                                                    const domain_enum domain);
 283
 284 /* The type of the MATCHER argument to block_find_symbol.  */
 285
 286 typedef int (block_symbol_matcher_ftype) (struct symbol *, void *);
 287
 288 /* Find symbol NAME in BLOCK and in DOMAIN that satisfies MATCHER.
 289    DATA is passed unchanged to MATCHER.
 290    BLOCK must be STATIC_BLOCK or GLOBAL_BLOCK.  */
 291
 292 extern struct symbol *block_find_symbol (const struct block *block,
 293                                          const char *name,
 294                                          const domain_enum domain,
 295                                          block_symbol_matcher_ftype *matcher,
 296                                          void *data);
 297
 298 /* A matcher function for block_find_symbol to find only symbols with
 299    non-opaque types.  */
 300
 301 extern int block_find_non_opaque_type (struct symbol *sym, void *data);
 302
 303 /* A matcher function for block_find_symbol to prefer symbols with
 304    non-opaque types.  The way to use this function is as follows:
 305
 306    struct symbol *with_opaque = NULL;
 307    struct symbol *sym
 308      = block_find_symbol (block, name, domain,
 309                           block_find_non_opaque_type_preferred, &with_opaque);
 310
 311    At this point if SYM is non-NULL then a non-opaque type has been found.
 312    Otherwise, if WITH_OPAQUE is non-NULL then an opaque type has been found.
 313    Otherwise, the symbol was not found.  */
 314
 315 extern int block_find_non_opaque_type_preferred (struct symbol *sym,
 316                                                  void *data);
 317
 318 /* Macro to loop through all symbols in BLOCK, in no particular
 319    order.  ITER helps keep track of the iteration, and must be a
 320    struct block_iterator.  SYM points to the current symbol.  */
 321
 322 #define ALL_BLOCK_SYMBOLS(block, iter, sym)             \
 323   for ((sym) = block_iterator_first ((block), &(iter)); \
 324        (sym);                                           \
 325        (sym) = block_iterator_next (&(iter)))
 326
 327 /* Macro to loop through all symbols with name NAME in BLOCK,
 328    in no particular order.  ITER helps keep track of the iteration, and
 329    must be a struct block_iterator.  SYM points to the current symbol.  */
 330
 331 #define ALL_BLOCK_SYMBOLS_WITH_NAME(block, name, iter, sym)             \
 332   for ((sym) = block_iter_name_first ((block), (name), &(iter));        \
 333        (sym) != NULL;                                                   \
 334        (sym) = block_iter_name_next ((name), &(iter)))
 335
 336 #endif /* BLOCK_H */