gdb/block.h

   1 /* Code dealing with blocks for GDB.
   2
   3    Copyright (C) 2003-2014 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 BLOCK_H
  21 #define BLOCK_H
  22
  23 #include "dictionary.h"
  24
  25 /* Opaque declarations.  */
  26
  27 struct symbol;
  28 struct 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   /* Used for language-specific info.  */
  86
  87   union
  88   {
  89     struct
  90     {
  91       /* Contains information about namespace-related info relevant to
  92          this block: using directives and the current namespace
  93          scope.  */
  94
  95       struct block_namespace_info *namespace;
  96     }
  97     cplus_specific;
  98   }
  99   language_specific;
 100 };
 101
 102 /* The global block is singled out so that we can provide a back-link
 103    to the primary symtab.  */
 104
 105 struct global_block
 106 {
 107   /* The block.  */
 108
 109   struct block block;
 110
 111   /* This holds a pointer to the primary symtab holding this
 112      block.  */
 113
 114   struct symtab *symtab;
 115 };
 116
 117 #define BLOCK_START(bl)         (bl)->startaddr
 118 #define BLOCK_END(bl)           (bl)->endaddr
 119 #define BLOCK_FUNCTION(bl)      (bl)->function
 120 #define BLOCK_SUPERBLOCK(bl)    (bl)->superblock
 121 #define BLOCK_DICT(bl)          (bl)->dict
 122 #define BLOCK_NAMESPACE(bl)   (bl)->language_specific.cplus_specific.namespace
 123
 124 struct blockvector
 125 {
 126   /* Number of blocks in the list.  */
 127   int nblocks;
 128   /* An address map mapping addresses to blocks in this blockvector.
 129      This pointer is zero if the blocks' start and end addresses are
 130      enough.  */
 131   struct addrmap *map;
 132   /* The blocks themselves.  */
 133   struct block *block[1];
 134 };
 135
 136 #define BLOCKVECTOR_NBLOCKS(blocklist) (blocklist)->nblocks
 137 #define BLOCKVECTOR_BLOCK(blocklist,n) (blocklist)->block[n]
 138 #define BLOCKVECTOR_MAP(blocklist) ((blocklist)->map)
 139
 140 extern struct symbol *block_linkage_function (const struct block *);
 141
 142 extern struct symbol *block_containing_function (const struct block *);
 143
 144 extern int block_inlined_p (const struct block *block);
 145
 146 extern int contained_in (const struct block *, const struct block *);
 147
 148 extern const struct blockvector *blockvector_for_pc (CORE_ADDR,
 149                                                const struct block **);
 150
 151 extern const struct blockvector *blockvector_for_pc_sect (CORE_ADDR,
 152                                                           struct obj_section *,
 153                                                           const struct block **,
 154                                                           struct symtab *);
 155
 156 extern int blockvector_contains_pc (const struct blockvector *bv, CORE_ADDR pc);
 157
 158 extern struct call_site *call_site_for_pc (struct gdbarch *gdbarch,
 159                                            CORE_ADDR pc);
 160
 161 extern const struct block *block_for_pc (CORE_ADDR);
 162
 163 extern const struct block *block_for_pc_sect (CORE_ADDR, struct obj_section *);
 164
 165 extern const char *block_scope (const struct block *block);
 166
 167 extern void block_set_scope (struct block *block, const char *scope,
 168                              struct obstack *obstack);
 169
 170 extern struct using_direct *block_using (const struct block *block);
 171
 172 extern void block_set_using (struct block *block,
 173                              struct using_direct *using,
 174                              struct obstack *obstack);
 175
 176 extern const struct block *block_static_block (const struct block *block);
 177
 178 extern const struct block *block_global_block (const struct block *block);
 179
 180 extern struct block *allocate_block (struct obstack *obstack);
 181
 182 extern struct block *allocate_global_block (struct obstack *obstack);
 183
 184 extern void set_block_symtab (struct block *, struct symtab *);
 185
 186 /* A block iterator.  This structure should be treated as though it
 187    were opaque; it is only defined here because we want to support
 188    stack allocation of iterators.  */
 189
 190 struct block_iterator
 191 {
 192   /* If we're iterating over a single block, this holds the block.
 193      Otherwise, it holds the canonical symtab.  */
 194
 195   union
 196   {
 197     struct symtab *symtab;
 198     const struct block *block;
 199   } d;
 200
 201   /* If we're iterating over a single block, this is always -1.
 202      Otherwise, it holds the index of the current "included" symtab in
 203      the canonical symtab (that is, d.symtab->includes[idx]), with -1
 204      meaning the canonical symtab itself.  */
 205
 206   int idx;
 207
 208   /* Which block, either static or global, to iterate over.  If this
 209      is FIRST_LOCAL_BLOCK, then we are iterating over a single block.
 210      This is used to select which field of 'd' is in use.  */
 211
 212   enum block_enum which;
 213
 214   /* The underlying dictionary iterator.  */
 215
 216   struct dict_iterator dict_iter;
 217 };
 218
 219 /* Initialize ITERATOR to point at the first symbol in BLOCK, and
 220    return that first symbol, or NULL if BLOCK is empty.  */
 221
 222 extern struct symbol *block_iterator_first (const struct block *block,
 223                                             struct block_iterator *iterator);
 224
 225 /* Advance ITERATOR, and return the next symbol, or NULL if there are
 226    no more symbols.  Don't call this if you've previously received
 227    NULL from block_iterator_first or block_iterator_next on this
 228    iteration.  */
 229
 230 extern struct symbol *block_iterator_next (struct block_iterator *iterator);
 231
 232 /* Initialize ITERATOR to point at the first symbol in BLOCK whose
 233    SYMBOL_SEARCH_NAME is NAME (as tested using strcmp_iw), and return
 234    that first symbol, or NULL if there are no such symbols.  */
 235
 236 extern struct symbol *block_iter_name_first (const struct block *block,
 237                                              const char *name,
 238                                              struct block_iterator *iterator);
 239
 240 /* Advance ITERATOR to point at the next symbol in BLOCK whose
 241    SYMBOL_SEARCH_NAME is NAME (as tested using strcmp_iw), or NULL if
 242    there are no more such symbols.  Don't call this if you've
 243    previously received NULL from block_iterator_first or
 244    block_iterator_next on this iteration.  And don't call it unless
 245    ITERATOR was created by a previous call to block_iter_name_first
 246    with the same NAME.  */
 247
 248 extern struct symbol *block_iter_name_next (const char *name,
 249                                             struct block_iterator *iterator);
 250
 251 /* Initialize ITERATOR to point at the first symbol in BLOCK whose
 252    SYMBOL_SEARCH_NAME is NAME, as tested using COMPARE (which must use
 253    the same conventions as strcmp_iw and be compatible with any
 254    block hashing function), and return that first symbol, or NULL
 255    if there are no such symbols.  */
 256
 257 extern struct symbol *block_iter_match_first (const struct block *block,
 258                                               const char *name,
 259                                               symbol_compare_ftype *compare,
 260                                               struct block_iterator *iterator);
 261
 262 /* Advance ITERATOR to point at the next symbol in BLOCK whose
 263    SYMBOL_SEARCH_NAME is NAME, as tested using COMPARE (see
 264    block_iter_match_first), or NULL if there are no more such symbols.
 265    Don't call this if you've previously received NULL from
 266    block_iterator_match_first or block_iterator_match_next on this
 267    iteration.  And don't call it unless ITERATOR was created by a
 268    previous call to block_iter_match_first with the same NAME and COMPARE.  */
 269
 270 extern struct symbol *block_iter_match_next (const char *name,
 271                                              symbol_compare_ftype *compare,
 272                                              struct block_iterator *iterator);
 273
 274 /* Macro to loop through all symbols in a block BL, in no particular
 275    order.  ITER helps keep track of the iteration, and should be a
 276    struct block_iterator.  SYM points to the current symbol.  */
 277
 278 #define ALL_BLOCK_SYMBOLS(block, iter, sym)             \
 279   for ((sym) = block_iterator_first ((block), &(iter)); \
 280        (sym);                                           \
 281        (sym) = block_iterator_next (&(iter)))
 282
 283 #endif /* BLOCK_H */