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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 | ||
9eae7c52 TT |
42 | /* Return the offset size given in the compilation unit header for CU. */ |
43 | int dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *cu); | |
44 | ||
9aa1f1e3 TT |
45 | /* Return the text offset of the CU. The returned offset comes from |
46 | this CU's objfile. If this objfile came from a separate debuginfo | |
47 | file, then the offset may be different from the corresponding | |
48 | offset in the parent objfile. */ | |
49 | CORE_ADDR dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *cu); | |
50 | ||
8cf6f0b1 TT |
51 | /* Find a particular location expression from a location list. */ |
52 | const gdb_byte *dwarf2_find_location_expression | |
53 | (struct dwarf2_loclist_baton *baton, | |
54 | size_t *locexpr_length, | |
55 | CORE_ADDR pc); | |
56 | ||
5c631832 | 57 | struct dwarf2_locexpr_baton dwarf2_fetch_die_location_block |
8cf6f0b1 TT |
58 | (unsigned int offset, struct dwarf2_per_cu_data *per_cu, |
59 | CORE_ADDR (*get_frame_pc) (void *baton), | |
60 | void *baton); | |
5c631832 | 61 | |
98bfdba5 PA |
62 | /* Evaluate a location description, starting at DATA and with length |
63 | SIZE, to find the current location of variable of TYPE in the context | |
64 | of FRAME. */ | |
65 | ||
66 | struct value *dwarf2_evaluate_loc_desc (struct type *type, | |
67 | struct frame_info *frame, | |
68 | const gdb_byte *data, | |
69 | unsigned short size, | |
70 | struct dwarf2_per_cu_data *per_cu); | |
71 | ||
0d53c4c4 DJ |
72 | /* The symbol location baton types used by the DWARF-2 reader (i.e. |
73 | SYMBOL_LOCATION_BATON for a LOC_COMPUTED symbol). "struct | |
74 | dwarf2_locexpr_baton" is for a symbol with a single location | |
75 | expression; "struct dwarf2_loclist_baton" is for a symbol with a | |
76 | location list. */ | |
4c2df51b DJ |
77 | |
78 | struct dwarf2_locexpr_baton | |
79 | { | |
0d53c4c4 | 80 | /* Pointer to the start of the location expression. */ |
947bb88f | 81 | const gdb_byte *data; |
0d53c4c4 DJ |
82 | |
83 | /* Length of the location expression. */ | |
607269ae | 84 | unsigned long size; |
0d53c4c4 | 85 | |
ae0d2f24 UW |
86 | /* The compilation unit containing the symbol whose location |
87 | we're computing. */ | |
88 | struct dwarf2_per_cu_data *per_cu; | |
0d53c4c4 DJ |
89 | }; |
90 | ||
91 | struct dwarf2_loclist_baton | |
92 | { | |
93 | /* The initial base address for the location list, based on the compilation | |
94 | unit. */ | |
95 | CORE_ADDR base_address; | |
96 | ||
97 | /* Pointer to the start of the location list. */ | |
947bb88f | 98 | const gdb_byte *data; |
0d53c4c4 DJ |
99 | |
100 | /* Length of the location list. */ | |
607269ae | 101 | unsigned long size; |
0d53c4c4 | 102 | |
ae0d2f24 UW |
103 | /* The compilation unit containing the symbol whose location |
104 | we're computing. */ | |
105 | struct dwarf2_per_cu_data *per_cu; | |
4c2df51b DJ |
106 | }; |
107 | ||
768a979c UW |
108 | extern const struct symbol_computed_ops dwarf2_locexpr_funcs; |
109 | extern const struct symbol_computed_ops dwarf2_loclist_funcs; | |
4c2df51b | 110 | |
9f6f94ff TT |
111 | /* Compile a DWARF location expression to an agent expression. |
112 | ||
113 | EXPR is the agent expression we are building. | |
114 | LOC is the agent value we modify. | |
115 | ARCH is the architecture. | |
116 | ADDR_SIZE is the size of addresses, in bytes. | |
117 | OP_PTR is the start of the location expression. | |
118 | OP_END is one past the last byte of the location expression. | |
119 | ||
120 | This will throw an exception for various kinds of errors -- for | |
121 | example, if the expression cannot be compiled, or if the expression | |
122 | is invalid. */ | |
123 | ||
124 | extern void dwarf2_compile_expr_to_ax (struct agent_expr *expr, | |
125 | struct axs_value *loc, | |
126 | struct gdbarch *arch, | |
127 | unsigned int addr_size, | |
128 | const gdb_byte *op_ptr, | |
129 | const gdb_byte *op_end, | |
130 | struct dwarf2_per_cu_data *per_cu); | |
131 | ||
852483bc | 132 | #endif /* dwarf2loc.h */ |