1 /* DWARF 2 location expression support for GDB.
3 Copyright (C) 2003, 2005, 2007-2012 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
20 #if !defined (DWARF2LOC_H)
23 #include "dwarf2expr.h"
25 struct symbol_computed_ops
;
27 struct dwarf2_per_cu_data
;
28 struct dwarf2_loclist_baton
;
32 /* This header is private to the DWARF-2 reader. It is shared between
33 dwarf2read.c and dwarf2loc.c. */
35 /* `set debug entry-values' setting. */
36 extern int entry_values_debug
;
38 /* Return the OBJFILE associated with the compilation unit CU. If CU
39 came from a separate debuginfo file, then the master objfile is
41 struct objfile
*dwarf2_per_cu_objfile (struct dwarf2_per_cu_data
*cu
);
43 /* Return the address size given in the compilation unit header for CU. */
44 int dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data
*cu
);
46 /* Return the DW_FORM_ref_addr size given in the compilation unit header for
48 int dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data
*cu
);
50 /* Return the offset size given in the compilation unit header for CU. */
51 int dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data
*cu
);
53 /* Return the text offset of the CU. The returned offset comes from
54 this CU's objfile. If this objfile came from a separate debuginfo
55 file, then the offset may be different from the corresponding
56 offset in the parent objfile. */
57 CORE_ADDR
dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data
*cu
);
59 /* Find a particular location expression from a location list. */
60 const gdb_byte
*dwarf2_find_location_expression
61 (struct dwarf2_loclist_baton
*baton
,
62 size_t *locexpr_length
,
65 struct dwarf2_locexpr_baton dwarf2_fetch_die_location_block
66 (cu_offset offset_in_cu
, struct dwarf2_per_cu_data
*per_cu
,
67 CORE_ADDR (*get_frame_pc
) (void *baton
),
70 struct type
*dwarf2_get_die_type (cu_offset die_offset
,
71 struct dwarf2_per_cu_data
*per_cu
);
73 /* Evaluate a location description, starting at DATA and with length
74 SIZE, to find the current location of variable of TYPE in the context
77 struct value
*dwarf2_evaluate_loc_desc (struct type
*type
,
78 struct frame_info
*frame
,
81 struct dwarf2_per_cu_data
*per_cu
);
83 CORE_ADDR
dwarf2_read_addr_index (struct dwarf2_per_cu_data
*per_cu
,
84 unsigned int addr_index
);
86 /* The symbol location baton types used by the DWARF-2 reader (i.e.
87 SYMBOL_LOCATION_BATON for a LOC_COMPUTED symbol). "struct
88 dwarf2_locexpr_baton" is for a symbol with a single location
89 expression; "struct dwarf2_loclist_baton" is for a symbol with a
92 struct dwarf2_locexpr_baton
94 /* Pointer to the start of the location expression. Valid only if SIZE is
98 /* Length of the location expression. For optimized out expressions it is
102 /* The compilation unit containing the symbol whose location
104 struct dwarf2_per_cu_data
*per_cu
;
107 struct dwarf2_loclist_baton
109 /* The initial base address for the location list, based on the compilation
111 CORE_ADDR base_address
;
113 /* Pointer to the start of the location list. */
114 const gdb_byte
*data
;
116 /* Length of the location list. */
119 /* The compilation unit containing the symbol whose location
121 struct dwarf2_per_cu_data
*per_cu
;
124 extern const struct symbol_computed_ops dwarf2_locexpr_funcs
;
125 extern const struct symbol_computed_ops dwarf2_loclist_funcs
;
127 /* Compile a DWARF location expression to an agent expression.
129 EXPR is the agent expression we are building.
130 LOC is the agent value we modify.
131 ARCH is the architecture.
132 ADDR_SIZE is the size of addresses, in bytes.
133 OP_PTR is the start of the location expression.
134 OP_END is one past the last byte of the location expression.
136 This will throw an exception for various kinds of errors -- for
137 example, if the expression cannot be compiled, or if the expression
140 extern void dwarf2_compile_expr_to_ax (struct agent_expr
*expr
,
141 struct axs_value
*loc
,
142 struct gdbarch
*arch
,
143 unsigned int addr_size
,
144 const gdb_byte
*op_ptr
,
145 const gdb_byte
*op_end
,
146 struct dwarf2_per_cu_data
*per_cu
);
148 /* Determined tail calls for constructing virtual tail call frames. */
150 struct call_site_chain
152 /* Initially CALLERS == CALLEES == LENGTH. For partially ambiguous result
153 CALLERS + CALLEES < LENGTH. */
154 int callers
, callees
, length
;
156 /* Variably sized array with LENGTH elements. Later [0..CALLERS-1] contain
157 top (GDB "prev") sites and [LENGTH-CALLEES..LENGTH-1] contain bottom
158 (GDB "next") sites. One is interested primarily in the PC field. */
159 struct call_site
*call_site
[1];
162 struct call_site_stuff
;
163 extern struct call_site_chain
*call_site_find_chain (struct gdbarch
*gdbarch
,
165 CORE_ADDR callee_pc
);
167 #endif /* dwarf2loc.h */