gdb/dwarf2loc.h

   1 /* DWARF 2 location expression support for GDB.
   2
   3    Copyright (C) 2003, 2005, 2007, 2008 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 #if !defined (DWARF2LOC_H)
  21 #define DWARF2LOC_H
  22
  23 struct symbol_ops;
  24
  25 /* This header is private to the DWARF-2 reader.  It is shared between
  26    dwarf2read.c and dwarf2loc.c.  */
  27
  28 /* The symbol location baton types used by the DWARF-2 reader (i.e.
  29    SYMBOL_LOCATION_BATON for a LOC_COMPUTED symbol).  "struct
  30    dwarf2_locexpr_baton" is for a symbol with a single location
  31    expression; "struct dwarf2_loclist_baton" is for a symbol with a
  32    location list.  */
  33
  34 struct dwarf2_locexpr_baton
  35 {
  36   /* Pointer to the start of the location expression.  */
  37   gdb_byte *data;
  38
  39   /* Length of the location expression.  */
  40   unsigned long size;
  41
  42   /* The objfile containing the symbol whose location we're computing.  */
  43   struct objfile *objfile;
  44 };
  45
  46 struct dwarf2_loclist_baton
  47 {
  48   /* The initial base address for the location list, based on the compilation
  49      unit.  */
  50   CORE_ADDR base_address;
  51
  52   /* Pointer to the start of the location list.  */
  53   gdb_byte *data;
  54
  55   /* Length of the location list.  */
  56   unsigned long size;
  57
  58   /* The objfile containing the symbol whose location we're computing.  */
  59   /* Used (only???) by thread local variables.  The objfile in which
  60      this symbol is defined.  To find a thread-local variable (e.g., a
  61      variable declared with the `__thread' storage class), we may need
  62      to know which object file it's in.  */
  63   struct objfile *objfile;
  64 };
  65
  66 extern const struct symbol_ops dwarf2_locexpr_funcs;
  67 extern const struct symbol_ops dwarf2_loclist_funcs;
  68
  69 #endif /* dwarf2loc.h */