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 #define BLOCK_START(bl)         (bl)->startaddr
 103 #define BLOCK_END(bl)           (bl)->endaddr
 104 #define BLOCK_FUNCTION(bl)      (bl)->function
 105 #define BLOCK_SUPERBLOCK(bl)    (bl)->superblock
 106 #define BLOCK_DICT(bl)          (bl)->dict
 107 #define BLOCK_NAMESPACE(bl)   (bl)->language_specific.cplus_specific.namespace
 108
 109 struct blockvector
 110 {
 111   /* Number of blocks in the list.  */
 112   int nblocks;
 113   /* An address map mapping addresses to blocks in this blockvector.
 114      This pointer is zero if the blocks' start and end addresses are
 115      enough.  */
 116   struct addrmap *map;
 117   /* The blocks themselves.  */
 118   struct block *block[1];
 119 };
 120
 121 #define BLOCKVECTOR_NBLOCKS(blocklist) (blocklist)->nblocks
 122 #define BLOCKVECTOR_BLOCK(blocklist,n) (blocklist)->block[n]
 123 #define BLOCKVECTOR_MAP(blocklist) ((blocklist)->map)
 124
 125 extern struct symbol *block_linkage_function (const struct block *);
 126
 127 extern struct symbol *block_containing_function (const struct block *);
 128
 129 extern int block_inlined_p (const struct block *block);
 130
 131 extern int contained_in (const struct block *, const struct block *);
 132
 133 extern struct blockvector *blockvector_for_pc (CORE_ADDR, struct block **);
 134
 135 extern struct blockvector *blockvector_for_pc_sect (CORE_ADDR,
 136                                                     struct obj_section *,
 137                                                     struct block **,
 138                                                     struct symtab *);
 139
 140 extern struct call_site *call_site_for_pc (struct gdbarch *gdbarch,
 141                                            CORE_ADDR pc);
 142
 143 extern struct block *block_for_pc (CORE_ADDR);
 144
 145 extern struct block *block_for_pc_sect (CORE_ADDR, struct obj_section *);
 146
 147 extern const char *block_scope (const struct block *block);
 148
 149 extern void block_set_scope (struct block *block, const char *scope,
 150                              struct obstack *obstack);
 151
 152 extern struct using_direct *block_using (const struct block *block);
 153
 154 extern void block_set_using (struct block *block,
 155                              struct using_direct *using,
 156                              struct obstack *obstack);
 157
 158 extern const struct block *block_static_block (const struct block *block);
 159
 160 extern const struct block *block_global_block (const struct block *block);
 161
 162 extern struct block *allocate_block (struct obstack *obstack);
 163
 164
 165 /* A block iterator.  This structure should be treated as though it
 166    were opaque; it is only defined here because we want to support
 167    stack allocation of iterators.  */
 168
 169 struct block_iterator
 170 {
 171   /* The underlying dictionary iterator.  */
 172
 173   struct dict_iterator dict_iter;
 174 };
 175
 176 /* Initialize ITERATOR to point at the first symbol in BLOCK, and
 177    return that first symbol, or NULL if BLOCK is empty.  */
 178
 179 extern struct symbol *block_iterator_first (const struct block *block,
 180                                             struct block_iterator *iterator);
 181
 182 /* Advance ITERATOR, and return the next symbol, or NULL if there are
 183    no more symbols.  Don't call this if you've previously received
 184    NULL from block_iterator_first or block_iterator_next on this
 185    iteration.  */
 186
 187 extern struct symbol *block_iterator_next (struct block_iterator *iterator);
 188
 189 /* Initialize ITERATOR to point at the first symbol in BLOCK whose
 190    SYMBOL_SEARCH_NAME is NAME (as tested using strcmp_iw), and return
 191    that first symbol, or NULL if there are no such symbols.  */
 192
 193 extern struct symbol *block_iter_name_first (const struct block *block,
 194                                              const char *name,
 195                                              struct block_iterator *iterator);
 196
 197 /* Advance ITERATOR to point at the next symbol in BLOCK whose
 198    SYMBOL_SEARCH_NAME is NAME (as tested using strcmp_iw), or NULL if
 199    there are no more such symbols.  Don't call this if you've
 200    previously received NULL from block_iterator_first or
 201    block_iterator_next on this iteration.  And don't call it unless
 202    ITERATOR was created by a previous call to block_iter_name_first
 203    with the same NAME.  */
 204
 205 extern struct symbol *block_iter_name_next (const char *name,
 206                                             struct block_iterator *iterator);
 207
 208 /* Initialize ITERATOR to point at the first symbol in BLOCK whose
 209    SYMBOL_SEARCH_NAME is NAME, as tested using COMPARE (which must use
 210    the same conventions as strcmp_iw and be compatible with any
 211    block hashing function), and return that first symbol, or NULL
 212    if there are no such symbols.  */
 213
 214 extern struct symbol *block_iter_match_first (const struct block *block,
 215                                               const char *name,
 216                                               symbol_compare_ftype *compare,
 217                                               struct block_iterator *iterator);
 218
 219 /* Advance ITERATOR to point at the next symbol in BLOCK whose
 220    SYMBOL_SEARCH_NAME is NAME, as tested using COMPARE (see
 221    block_iter_match_first), or NULL if there are no more such symbols.
 222    Don't call this if you've previously received NULL from
 223    block_iterator_match_first or block_iterator_match_next on this
 224    iteration.  And don't call it unless ITERATOR was created by a
 225    previous call to block_iter_match_first with the same NAME and COMPARE.  */
 226
 227 extern struct symbol *block_iter_match_next (const char *name,
 228                                              symbol_compare_ftype *compare,
 229                                              struct block_iterator *iterator);
 230
 231 /* Macro to loop through all symbols in a block BL, in no particular
 232    order.  ITER helps keep track of the iteration, and should be a
 233    struct block_iterator.  SYM points to the current symbol.  */
 234
 235 #define ALL_BLOCK_SYMBOLS(block, iter, sym)             \
 236   for ((sym) = block_iterator_first ((block), &(iter)); \
 237        (sym);                                           \
 238        (sym) = block_iterator_next (&(iter)))
 239
 240 #endif /* BLOCK_H */