Commit | Line | Data |
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852483bc MK |
1 | /* DWARF 2 location expression support for GDB. |
2 | ||
7b6bb8da | 3 | Copyright (C) 2003, 2005, 2007, 2008, 2009, 2010, 2011 |
4c38e0a4 | 4 | Free Software Foundation, Inc. |
4c2df51b DJ |
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 | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
4c2df51b DJ |
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 | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
4c2df51b DJ |
20 | |
21 | #if !defined (DWARF2LOC_H) | |
22 | #define DWARF2LOC_H | |
23 | ||
768a979c | 24 | struct symbol_computed_ops; |
ae0d2f24 UW |
25 | struct objfile; |
26 | struct dwarf2_per_cu_data; | |
8cf6f0b1 | 27 | struct dwarf2_loclist_baton; |
9f6f94ff TT |
28 | struct agent_expr; |
29 | struct axs_value; | |
a67af2b9 | 30 | |
4c2df51b DJ |
31 | /* This header is private to the DWARF-2 reader. It is shared between |
32 | dwarf2read.c and dwarf2loc.c. */ | |
33 | ||
9aa1f1e3 TT |
34 | /* Return the OBJFILE associated with the compilation unit CU. If CU |
35 | came from a separate debuginfo file, then the master objfile is | |
36 | returned. */ | |
ae0d2f24 UW |
37 | struct objfile *dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *cu); |
38 | ||
39 | /* Return the address size given in the compilation unit header for CU. */ | |
40 | CORE_ADDR dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *cu); | |
41 | ||
181cebd4 JK |
42 | /* Return the DW_FORM_ref_addr size given in the compilation unit header for |
43 | CU. */ | |
44 | int dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *cu); | |
45 | ||
9eae7c52 TT |
46 | /* Return the offset size given in the compilation unit header for CU. */ |
47 | int dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *cu); | |
48 | ||
9aa1f1e3 TT |
49 | /* Return the text offset of the CU. The returned offset comes from |
50 | this CU's objfile. If this objfile came from a separate debuginfo | |
51 | file, then the offset may be different from the corresponding | |
52 | offset in the parent objfile. */ | |
53 | CORE_ADDR dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *cu); | |
54 | ||
8cf6f0b1 TT |
55 | /* Find a particular location expression from a location list. */ |
56 | const gdb_byte *dwarf2_find_location_expression | |
57 | (struct dwarf2_loclist_baton *baton, | |
58 | size_t *locexpr_length, | |
59 | CORE_ADDR pc); | |
60 | ||
5c631832 | 61 | struct dwarf2_locexpr_baton dwarf2_fetch_die_location_block |
8cf6f0b1 TT |
62 | (unsigned int offset, struct dwarf2_per_cu_data *per_cu, |
63 | CORE_ADDR (*get_frame_pc) (void *baton), | |
64 | void *baton); | |
5c631832 | 65 | |
8a9b8146 TT |
66 | struct type *dwarf2_get_die_type (unsigned int die_offset, |
67 | struct dwarf2_per_cu_data *per_cu); | |
68 | ||
98bfdba5 PA |
69 | /* Evaluate a location description, starting at DATA and with length |
70 | SIZE, to find the current location of variable of TYPE in the context | |
71 | of FRAME. */ | |
72 | ||
73 | struct value *dwarf2_evaluate_loc_desc (struct type *type, | |
74 | struct frame_info *frame, | |
75 | const gdb_byte *data, | |
76 | unsigned short size, | |
77 | struct dwarf2_per_cu_data *per_cu); | |
78 | ||
0d53c4c4 DJ |
79 | /* The symbol location baton types used by the DWARF-2 reader (i.e. |
80 | SYMBOL_LOCATION_BATON for a LOC_COMPUTED symbol). "struct | |
81 | dwarf2_locexpr_baton" is for a symbol with a single location | |
82 | expression; "struct dwarf2_loclist_baton" is for a symbol with a | |
83 | location list. */ | |
4c2df51b DJ |
84 | |
85 | struct dwarf2_locexpr_baton | |
86 | { | |
0d53c4c4 | 87 | /* Pointer to the start of the location expression. */ |
947bb88f | 88 | const gdb_byte *data; |
0d53c4c4 DJ |
89 | |
90 | /* Length of the location expression. */ | |
607269ae | 91 | unsigned long size; |
0d53c4c4 | 92 | |
ae0d2f24 UW |
93 | /* The compilation unit containing the symbol whose location |
94 | we're computing. */ | |
95 | struct dwarf2_per_cu_data *per_cu; | |
0d53c4c4 DJ |
96 | }; |
97 | ||
98 | struct dwarf2_loclist_baton | |
99 | { | |
100 | /* The initial base address for the location list, based on the compilation | |
101 | unit. */ | |
102 | CORE_ADDR base_address; | |
103 | ||
104 | /* Pointer to the start of the location list. */ | |
947bb88f | 105 | const gdb_byte *data; |
0d53c4c4 DJ |
106 | |
107 | /* Length of the location list. */ | |
607269ae | 108 | unsigned long size; |
0d53c4c4 | 109 | |
ae0d2f24 UW |
110 | /* The compilation unit containing the symbol whose location |
111 | we're computing. */ | |
112 | struct dwarf2_per_cu_data *per_cu; | |
4c2df51b DJ |
113 | }; |
114 | ||
768a979c UW |
115 | extern const struct symbol_computed_ops dwarf2_locexpr_funcs; |
116 | extern const struct symbol_computed_ops dwarf2_loclist_funcs; | |
4c2df51b | 117 | |
9f6f94ff TT |
118 | /* Compile a DWARF location expression to an agent expression. |
119 | ||
120 | EXPR is the agent expression we are building. | |
121 | LOC is the agent value we modify. | |
122 | ARCH is the architecture. | |
123 | ADDR_SIZE is the size of addresses, in bytes. | |
124 | OP_PTR is the start of the location expression. | |
125 | OP_END is one past the last byte of the location expression. | |
126 | ||
127 | This will throw an exception for various kinds of errors -- for | |
128 | example, if the expression cannot be compiled, or if the expression | |
129 | is invalid. */ | |
130 | ||
131 | extern void dwarf2_compile_expr_to_ax (struct agent_expr *expr, | |
132 | struct axs_value *loc, | |
133 | struct gdbarch *arch, | |
134 | unsigned int addr_size, | |
135 | const gdb_byte *op_ptr, | |
136 | const gdb_byte *op_end, | |
137 | struct dwarf2_per_cu_data *per_cu); | |
138 | ||
852483bc | 139 | #endif /* dwarf2loc.h */ |