gdb/block.h

   1 /* Code dealing with blocks for GDB.
   2
   3    Copyright (C) 2003 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 2 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, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA.  */
  21
  22 #ifndef BLOCK_H
  23 #define BLOCK_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 dictionary;
  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; 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   /* Version of GCC used to compile the function corresponding
 102      to this block, or 0 if not compiled with GCC.  When possible,
 103      GCC should be compatible with the native compiler, or if that
 104      is not feasible, the differences should be fixed during symbol
 105      reading.  As of 16 Apr 93, this flag is never used to distinguish
 106      between gcc2 and the native compiler.
 107
 108      If there is no function corresponding to this block, this meaning
 109      of this flag is undefined.  */
 110
 111   unsigned char gcc_compile_flag;
 112 };
 113
 114 #define BLOCK_START(bl)         (bl)->startaddr
 115 #define BLOCK_END(bl)           (bl)->endaddr
 116 #define BLOCK_FUNCTION(bl)      (bl)->function
 117 #define BLOCK_SUPERBLOCK(bl)    (bl)->superblock
 118 #define BLOCK_GCC_COMPILED(bl)  (bl)->gcc_compile_flag
 119 #define BLOCK_DICT(bl)          (bl)->dict
 120 #define BLOCK_NAMESPACE(bl)   (bl)->language_specific.cplus_specific.namespace
 121
 122 /* Macro to loop through all symbols in a block BL, in no particular
 123    order.  ITER helps keep track of the iteration, and should be a
 124    struct dict_iterator.  SYM points to the current symbol.  */
 125
 126 #define ALL_BLOCK_SYMBOLS(block, iter, sym)                     \
 127         ALL_DICT_SYMBOLS (BLOCK_DICT (block), iter, sym)
 128
 129 struct blockvector
 130 {
 131   /* Number of blocks in the list.  */
 132   int nblocks;
 133   /* The blocks themselves.  */
 134   struct block *block[1];
 135 };
 136
 137 #define BLOCKVECTOR_NBLOCKS(blocklist) (blocklist)->nblocks
 138 #define BLOCKVECTOR_BLOCK(blocklist,n) (blocklist)->block[n]
 139
 140 /* Special block numbers */
 141
 142 enum { GLOBAL_BLOCK = 0, STATIC_BLOCK = 1, FIRST_LOCAL_BLOCK = 2 };
 143
 144 extern struct symbol *block_function (const struct block *);
 145
 146 extern int contained_in (const struct block *, const struct block *);
 147
 148 extern struct blockvector *blockvector_for_pc (CORE_ADDR, int *);
 149
 150 extern struct blockvector *blockvector_for_pc_sect (CORE_ADDR, asection *,
 151                                                     int *, struct symtab *);
 152
 153 extern struct block *block_for_pc (CORE_ADDR);
 154
 155 extern struct block *block_for_pc_sect (CORE_ADDR, asection *);
 156
 157 extern const char *block_scope (const struct block *block);
 158
 159 extern void block_set_scope (struct block *block, const char *scope,
 160                              struct obstack *obstack);
 161
 162 extern struct using_direct *block_using (const struct block *block);
 163
 164 extern void block_set_using (struct block *block,
 165                              struct using_direct *using,
 166                              struct obstack *obstack);
 167
 168 extern const struct block *block_static_block (const struct block *block);
 169
 170 extern const struct block *block_global_block (const struct block *block);
 171
 172 extern struct block *allocate_block (struct obstack *obstack);
 173
 174 #endif /* BLOCK_H */