1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
/* DWARF 2 location expression support for GDB.
Copyright (C) 2003, 2005, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#if !defined (DWARF2LOC_H)
#define DWARF2LOC_H
struct symbol_computed_ops;
struct objfile;
struct dwarf2_per_cu_data;
struct dwarf2_loclist_baton;
struct agent_expr;
struct axs_value;
/* This header is private to the DWARF-2 reader. It is shared between
dwarf2read.c and dwarf2loc.c. */
/* `set debug entry-values' setting. */
extern int entry_values_debug;
/* Return the OBJFILE associated with the compilation unit CU. If CU
came from a separate debuginfo file, then the master objfile is
returned. */
struct objfile *dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *cu);
/* Return the address size given in the compilation unit header for CU. */
CORE_ADDR dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *cu);
/* Return the DW_FORM_ref_addr size given in the compilation unit header for
CU. */
int dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *cu);
/* Return the offset size given in the compilation unit header for CU. */
int dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *cu);
/* Return the text offset of the CU. The returned offset comes from
this CU's objfile. If this objfile came from a separate debuginfo
file, then the offset may be different from the corresponding
offset in the parent objfile. */
CORE_ADDR dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *cu);
/* Find a particular location expression from a location list. */
const gdb_byte *dwarf2_find_location_expression
(struct dwarf2_loclist_baton *baton,
size_t *locexpr_length,
CORE_ADDR pc);
struct dwarf2_locexpr_baton dwarf2_fetch_die_location_block
(unsigned int offset, struct dwarf2_per_cu_data *per_cu,
CORE_ADDR (*get_frame_pc) (void *baton),
void *baton);
struct type *dwarf2_get_die_type (unsigned int die_offset,
struct dwarf2_per_cu_data *per_cu);
/* Evaluate a location description, starting at DATA and with length
SIZE, to find the current location of variable of TYPE in the context
of FRAME. */
struct value *dwarf2_evaluate_loc_desc (struct type *type,
struct frame_info *frame,
const gdb_byte *data,
unsigned short size,
struct dwarf2_per_cu_data *per_cu);
/* The symbol location baton types used by the DWARF-2 reader (i.e.
SYMBOL_LOCATION_BATON for a LOC_COMPUTED symbol). "struct
dwarf2_locexpr_baton" is for a symbol with a single location
expression; "struct dwarf2_loclist_baton" is for a symbol with a
location list. */
struct dwarf2_locexpr_baton
{
/* Pointer to the start of the location expression. */
const gdb_byte *data;
/* Length of the location expression. */
unsigned long size;
/* The compilation unit containing the symbol whose location
we're computing. */
struct dwarf2_per_cu_data *per_cu;
};
struct dwarf2_loclist_baton
{
/* The initial base address for the location list, based on the compilation
unit. */
CORE_ADDR base_address;
/* Pointer to the start of the location list. */
const gdb_byte *data;
/* Length of the location list. */
unsigned long size;
/* The compilation unit containing the symbol whose location
we're computing. */
struct dwarf2_per_cu_data *per_cu;
};
extern const struct symbol_computed_ops dwarf2_locexpr_funcs;
extern const struct symbol_computed_ops dwarf2_loclist_funcs;
/* Compile a DWARF location expression to an agent expression.
EXPR is the agent expression we are building.
LOC is the agent value we modify.
ARCH is the architecture.
ADDR_SIZE is the size of addresses, in bytes.
OP_PTR is the start of the location expression.
OP_END is one past the last byte of the location expression.
This will throw an exception for various kinds of errors -- for
example, if the expression cannot be compiled, or if the expression
is invalid. */
extern void dwarf2_compile_expr_to_ax (struct agent_expr *expr,
struct axs_value *loc,
struct gdbarch *arch,
unsigned int addr_size,
const gdb_byte *op_ptr,
const gdb_byte *op_end,
struct dwarf2_per_cu_data *per_cu);
#endif /* dwarf2loc.h */
|