1 /* DWARF 2 location expression support for GDB.
3 Copyright (C) 2003, 2005, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
6 This file is part of GDB.
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.
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.
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/>. */
21 #if !defined (DWARF2LOC_H)
24 struct symbol_computed_ops;
26 struct dwarf2_per_cu_data;
27 struct dwarf2_loclist_baton;
31 /* This header is private to the DWARF-2 reader. It is shared between
32 dwarf2read.c and dwarf2loc.c. */
34 /* `set debug entry-values' setting. */
35 extern int entry_values_debug;
37 /* Return the OBJFILE associated with the compilation unit CU. If CU
38 came from a separate debuginfo file, then the master objfile is
40 struct objfile *dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *cu);
42 /* Return the address size given in the compilation unit header for CU. */
43 CORE_ADDR dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *cu);
45 /* Return the DW_FORM_ref_addr size given in the compilation unit header for
47 int dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *cu);
49 /* Return the offset size given in the compilation unit header for CU. */
50 int dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *cu);
52 /* Return the text offset of the CU. The returned offset comes from
53 this CU's objfile. If this objfile came from a separate debuginfo
54 file, then the offset may be different from the corresponding
55 offset in the parent objfile. */
56 CORE_ADDR dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *cu);
58 /* Find a particular location expression from a location list. */
59 const gdb_byte *dwarf2_find_location_expression
60 (struct dwarf2_loclist_baton *baton,
61 size_t *locexpr_length,
64 struct dwarf2_locexpr_baton dwarf2_fetch_die_location_block
65 (unsigned int offset, struct dwarf2_per_cu_data *per_cu,
66 CORE_ADDR (*get_frame_pc) (void *baton),
69 struct type *dwarf2_get_die_type (unsigned int die_offset,
70 struct dwarf2_per_cu_data *per_cu);
72 /* Evaluate a location description, starting at DATA and with length
73 SIZE, to find the current location of variable of TYPE in the context
76 struct value *dwarf2_evaluate_loc_desc (struct type *type,
77 struct frame_info *frame,
80 struct dwarf2_per_cu_data *per_cu);
82 /* The symbol location baton types used by the DWARF-2 reader (i.e.
83 SYMBOL_LOCATION_BATON for a LOC_COMPUTED symbol). "struct
84 dwarf2_locexpr_baton" is for a symbol with a single location
85 expression; "struct dwarf2_loclist_baton" is for a symbol with a
88 struct dwarf2_locexpr_baton
90 /* Pointer to the start of the location expression. */
93 /* Length of the location expression. */
96 /* The compilation unit containing the symbol whose location
98 struct dwarf2_per_cu_data *per_cu;
101 struct dwarf2_loclist_baton
103 /* The initial base address for the location list, based on the compilation
105 CORE_ADDR base_address;
107 /* Pointer to the start of the location list. */
108 const gdb_byte *data;
110 /* Length of the location list. */
113 /* The compilation unit containing the symbol whose location
115 struct dwarf2_per_cu_data *per_cu;
118 extern const struct symbol_computed_ops dwarf2_locexpr_funcs;
119 extern const struct symbol_computed_ops dwarf2_loclist_funcs;
121 /* Compile a DWARF location expression to an agent expression.
123 EXPR is the agent expression we are building.
124 LOC is the agent value we modify.
125 ARCH is the architecture.
126 ADDR_SIZE is the size of addresses, in bytes.
127 OP_PTR is the start of the location expression.
128 OP_END is one past the last byte of the location expression.
130 This will throw an exception for various kinds of errors -- for
131 example, if the expression cannot be compiled, or if the expression
134 extern void dwarf2_compile_expr_to_ax (struct agent_expr *expr,
135 struct axs_value *loc,
136 struct gdbarch *arch,
137 unsigned int addr_size,
138 const gdb_byte *op_ptr,
139 const gdb_byte *op_end,
140 struct dwarf2_per_cu_data *per_cu);
142 #endif /* dwarf2loc.h */