gdb/dwarf2loc.h

   1 /* DWARF 2 location expression support for GDB.
   2
   3    Copyright (C) 2003, 2005, 2007, 2008, 2009, 2010
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #if !defined (DWARF2LOC_H)
  22 #define DWARF2LOC_H
  23
  24 struct symbol_computed_ops;
  25 struct objfile;
  26 struct dwarf2_per_cu_data;
  27
  28 /* This header is private to the DWARF-2 reader.  It is shared between
  29    dwarf2read.c and dwarf2loc.c.  */
  30
  31 /* Return the OBJFILE associated with the compilation unit CU.  If CU
  32    came from a separate debuginfo file, then the master objfile is
  33    returned.  */
  34 struct objfile *dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *cu);
  35
  36 /* Return the address size given in the compilation unit header for CU.  */
  37 CORE_ADDR dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *cu);
  38
  39 /* Return the offset size given in the compilation unit header for CU.  */
  40 int dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *cu);
  41
  42 /* Return the text offset of the CU.  The returned offset comes from
  43    this CU's objfile.  If this objfile came from a separate debuginfo
  44    file, then the offset may be different from the corresponding
  45    offset in the parent objfile.  */
  46 CORE_ADDR dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *cu);
  47
  48 struct dwarf2_locexpr_baton dwarf2_fetch_die_location_block
  49   (unsigned int offset, struct dwarf2_per_cu_data *per_cu);
  50
  51 /* Evaluate a location description, starting at DATA and with length
  52    SIZE, to find the current location of variable of TYPE in the context
  53    of FRAME.  */
  54
  55 struct value *dwarf2_evaluate_loc_desc (struct type *type,
  56                                         struct frame_info *frame,
  57                                         const gdb_byte *data,
  58                                         unsigned short size,
  59                                         struct dwarf2_per_cu_data *per_cu);
  60
  61 /* The symbol location baton types used by the DWARF-2 reader (i.e.
  62    SYMBOL_LOCATION_BATON for a LOC_COMPUTED symbol).  "struct
  63    dwarf2_locexpr_baton" is for a symbol with a single location
  64    expression; "struct dwarf2_loclist_baton" is for a symbol with a
  65    location list.  */
  66
  67 struct dwarf2_locexpr_baton
  68 {
  69   /* Pointer to the start of the location expression.  */
  70   const gdb_byte *data;
  71
  72   /* Length of the location expression.  */
  73   unsigned long size;
  74
  75   /* The compilation unit containing the symbol whose location
  76      we're computing.  */
  77   struct dwarf2_per_cu_data *per_cu;
  78 };
  79
  80 struct dwarf2_loclist_baton
  81 {
  82   /* The initial base address for the location list, based on the compilation
  83      unit.  */
  84   CORE_ADDR base_address;
  85
  86   /* Pointer to the start of the location list.  */
  87   const gdb_byte *data;
  88
  89   /* Length of the location list.  */
  90   unsigned long size;
  91
  92   /* The compilation unit containing the symbol whose location
  93      we're computing.  */
  94   struct dwarf2_per_cu_data *per_cu;
  95 };
  96
  97 extern const struct symbol_computed_ops dwarf2_locexpr_funcs;
  98 extern const struct symbol_computed_ops dwarf2_loclist_funcs;
  99
 100 #endif /* dwarf2loc.h */