gdb/block.h

   1 /* Code dealing with blocks for GDB.
   2
   3    Copyright (C) 2003, 2007-2012 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 struct blockvector *blockvector_for_pc (CORE_ADDR, struct block **);
 149
 150 extern struct blockvector *blockvector_for_pc_sect (CORE_ADDR,
 151                                                     struct obj_section *,
 152                                                     struct block **,
 153                                                     struct symtab *);
 154
 155 extern int blockvector_contains_pc (struct blockvector *bv, CORE_ADDR pc);
 156
 157 extern struct call_site *call_site_for_pc (struct gdbarch *gdbarch,
 158                                            CORE_ADDR pc);
 159
 160 extern struct block *block_for_pc (CORE_ADDR);
 161
 162 extern struct block *block_for_pc_sect (CORE_ADDR, struct obj_section *);
 163
 164 extern const char *block_scope (const struct block *block);
 165
 166 extern void block_set_scope (struct block *block, const char *scope,
 167                              struct obstack *obstack);
 168
 169 extern struct using_direct *block_using (const struct block *block);
 170
 171 extern void block_set_using (struct block *block,
 172                              struct using_direct *using,
 173                              struct obstack *obstack);
 174
 175 extern const struct block *block_static_block (const struct block *block);
 176
 177 extern const struct block *block_global_block (const struct block *block);
 178
 179 extern struct block *allocate_block (struct obstack *obstack);
 180
 181 extern struct block *allocate_global_block (struct obstack *obstack);
 182
 183 extern void set_block_symtab (struct block *, struct symtab *);
 184
 185 /* A block iterator.  This structure should be treated as though it
 186    were opaque; it is only defined here because we want to support
 187    stack allocation of iterators.  */
 188
 189 struct block_iterator
 190 {
 191   /* If we're iterating over a single block, this holds the block.
 192      Otherwise, it holds the canonical symtab.  */
 193
 194   union
 195   {
 196     struct symtab *symtab;
 197     const struct block *block;
 198   } d;
 199
 200   /* If we're iterating over a single block, this is always -1.
 201      Otherwise, it holds the index of the current "included" symtab in
 202      the canonical symtab (that is, d.symtab->includes[idx]), with -1
 203      meaning the canonical symtab itself.  */
 204
 205   int idx;
 206
 207   /* Which block, either static or global, to iterate over.  If this
 208      is FIRST_LOCAL_BLOCK, then we are iterating over a single block.
 209      This is used to select which field of 'd' is in use.  */
 210
 211   enum block_enum which;
 212
 213   /* The underlying dictionary iterator.  */
 214
 215   struct dict_iterator dict_iter;
 216 };
 217
 218 /* Initialize ITERATOR to point at the first symbol in BLOCK, and
 219    return that first symbol, or NULL if BLOCK is empty.  */
 220
 221 extern struct symbol *block_iterator_first (const struct block *block,
 222                                             struct block_iterator *iterator);
 223
 224 /* Advance ITERATOR, and return the next symbol, or NULL if there are
 225    no more symbols.  Don't call this if you've previously received
 226    NULL from block_iterator_first or block_iterator_next on this
 227    iteration.  */
 228
 229 extern struct symbol *block_iterator_next (struct block_iterator *iterator);
 230
 231 /* Initialize ITERATOR to point at the first symbol in BLOCK whose
 232    SYMBOL_SEARCH_NAME is NAME (as tested using strcmp_iw), and return
 233    that first symbol, or NULL if there are no such symbols.  */
 234
 235 extern struct symbol *block_iter_name_first (const struct block *block,
 236                                              const char *name,
 237                                              struct block_iterator *iterator);
 238
 239 /* Advance ITERATOR to point at the next symbol in BLOCK whose
 240    SYMBOL_SEARCH_NAME is NAME (as tested using strcmp_iw), or NULL if
 241    there are no more such symbols.  Don't call this if you've
 242    previously received NULL from block_iterator_first or
 243    block_iterator_next on this iteration.  And don't call it unless
 244    ITERATOR was created by a previous call to block_iter_name_first
 245    with the same NAME.  */
 246
 247 extern struct symbol *block_iter_name_next (const char *name,
 248                                             struct block_iterator *iterator);
 249
 250 /* Initialize ITERATOR to point at the first symbol in BLOCK whose
 251    SYMBOL_SEARCH_NAME is NAME, as tested using COMPARE (which must use
 252    the same conventions as strcmp_iw and be compatible with any
 253    block hashing function), and return that first symbol, or NULL
 254    if there are no such symbols.  */
 255
 256 extern struct symbol *block_iter_match_first (const struct block *block,
 257                                               const char *name,
 258                                               symbol_compare_ftype *compare,
 259                                               struct block_iterator *iterator);
 260
 261 /* Advance ITERATOR to point at the next symbol in BLOCK whose
 262    SYMBOL_SEARCH_NAME is NAME, as tested using COMPARE (see
 263    block_iter_match_first), or NULL if there are no more such symbols.
 264    Don't call this if you've previously received NULL from
 265    block_iterator_match_first or block_iterator_match_next on this
 266    iteration.  And don't call it unless ITERATOR was created by a
 267    previous call to block_iter_match_first with the same NAME and COMPARE.  */
 268
 269 extern struct symbol *block_iter_match_next (const char *name,
 270                                              symbol_compare_ftype *compare,
 271                                              struct block_iterator *iterator);
 272
 273 /* Macro to loop through all symbols in a block BL, in no particular
 274    order.  ITER helps keep track of the iteration, and should be a
 275    struct block_iterator.  SYM points to the current symbol.  */
 276
 277 #define ALL_BLOCK_SYMBOLS(block, iter, sym)             \
 278   for ((sym) = block_iterator_first ((block), &(iter)); \
 279        (sym);                                           \
 280        (sym) = block_iterator_next (&(iter)))
 281
 282 #endif /* BLOCK_H */