Commit | Line | Data |
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852483bc MK |
1 | /* DWARF 2 location expression support for GDB. |
2 | ||
0b302171 | 3 | Copyright (C) 2003, 2005, 2007-2012 Free Software Foundation, Inc. |
4c2df51b DJ |
4 | |
5 | This file is part of GDB. | |
6 | ||
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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
4c2df51b DJ |
10 | (at your option) any later version. |
11 | ||
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. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
4c2df51b DJ |
19 | |
20 | #if !defined (DWARF2LOC_H) | |
21 | #define DWARF2LOC_H | |
22 | ||
b64f50a1 JK |
23 | #include "dwarf2expr.h" |
24 | ||
768a979c | 25 | struct symbol_computed_ops; |
ae0d2f24 UW |
26 | struct objfile; |
27 | struct dwarf2_per_cu_data; | |
8cf6f0b1 | 28 | struct dwarf2_loclist_baton; |
9f6f94ff TT |
29 | struct agent_expr; |
30 | struct axs_value; | |
a67af2b9 | 31 | |
4c2df51b DJ |
32 | /* This header is private to the DWARF-2 reader. It is shared between |
33 | dwarf2read.c and dwarf2loc.c. */ | |
34 | ||
8e3b41a9 JK |
35 | /* `set debug entry-values' setting. */ |
36 | extern int entry_values_debug; | |
37 | ||
9aa1f1e3 TT |
38 | /* Return the OBJFILE associated with the compilation unit CU. If CU |
39 | came from a separate debuginfo file, then the master objfile is | |
40 | returned. */ | |
ae0d2f24 UW |
41 | struct objfile *dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *cu); |
42 | ||
43 | /* Return the address size given in the compilation unit header for CU. */ | |
98714339 | 44 | int dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *cu); |
ae0d2f24 | 45 | |
181cebd4 JK |
46 | /* Return the DW_FORM_ref_addr size given in the compilation unit header for |
47 | CU. */ | |
48 | int dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *cu); | |
49 | ||
9eae7c52 TT |
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); | |
52 | ||
9aa1f1e3 TT |
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); | |
58 | ||
8cf6f0b1 TT |
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, | |
63 | CORE_ADDR pc); | |
64 | ||
5c631832 | 65 | struct dwarf2_locexpr_baton dwarf2_fetch_die_location_block |
b64f50a1 | 66 | (cu_offset offset_in_cu, struct dwarf2_per_cu_data *per_cu, |
8cf6f0b1 TT |
67 | CORE_ADDR (*get_frame_pc) (void *baton), |
68 | void *baton); | |
5c631832 | 69 | |
b64f50a1 | 70 | struct type *dwarf2_get_die_type (cu_offset die_offset, |
8a9b8146 TT |
71 | struct dwarf2_per_cu_data *per_cu); |
72 | ||
98bfdba5 PA |
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 | |
75 | of FRAME. */ | |
76 | ||
77 | struct value *dwarf2_evaluate_loc_desc (struct type *type, | |
78 | struct frame_info *frame, | |
79 | const gdb_byte *data, | |
80 | unsigned short size, | |
81 | struct dwarf2_per_cu_data *per_cu); | |
82 | ||
0d53c4c4 DJ |
83 | /* The symbol location baton types used by the DWARF-2 reader (i.e. |
84 | SYMBOL_LOCATION_BATON for a LOC_COMPUTED symbol). "struct | |
85 | dwarf2_locexpr_baton" is for a symbol with a single location | |
86 | expression; "struct dwarf2_loclist_baton" is for a symbol with a | |
87 | location list. */ | |
4c2df51b DJ |
88 | |
89 | struct dwarf2_locexpr_baton | |
90 | { | |
1d6edc3c JK |
91 | /* Pointer to the start of the location expression. Valid only if SIZE is |
92 | not zero. */ | |
947bb88f | 93 | const gdb_byte *data; |
0d53c4c4 | 94 | |
1d6edc3c JK |
95 | /* Length of the location expression. For optimized out expressions it is |
96 | zero. */ | |
607269ae | 97 | unsigned long size; |
0d53c4c4 | 98 | |
ae0d2f24 UW |
99 | /* The compilation unit containing the symbol whose location |
100 | we're computing. */ | |
101 | struct dwarf2_per_cu_data *per_cu; | |
0d53c4c4 DJ |
102 | }; |
103 | ||
104 | struct dwarf2_loclist_baton | |
105 | { | |
106 | /* The initial base address for the location list, based on the compilation | |
107 | unit. */ | |
108 | CORE_ADDR base_address; | |
109 | ||
110 | /* Pointer to the start of the location list. */ | |
947bb88f | 111 | const gdb_byte *data; |
0d53c4c4 DJ |
112 | |
113 | /* Length of the location list. */ | |
607269ae | 114 | unsigned long size; |
0d53c4c4 | 115 | |
ae0d2f24 UW |
116 | /* The compilation unit containing the symbol whose location |
117 | we're computing. */ | |
118 | struct dwarf2_per_cu_data *per_cu; | |
4c2df51b DJ |
119 | }; |
120 | ||
768a979c UW |
121 | extern const struct symbol_computed_ops dwarf2_locexpr_funcs; |
122 | extern const struct symbol_computed_ops dwarf2_loclist_funcs; | |
4c2df51b | 123 | |
9f6f94ff TT |
124 | /* Compile a DWARF location expression to an agent expression. |
125 | ||
126 | EXPR is the agent expression we are building. | |
127 | LOC is the agent value we modify. | |
128 | ARCH is the architecture. | |
129 | ADDR_SIZE is the size of addresses, in bytes. | |
130 | OP_PTR is the start of the location expression. | |
131 | OP_END is one past the last byte of the location expression. | |
132 | ||
133 | This will throw an exception for various kinds of errors -- for | |
134 | example, if the expression cannot be compiled, or if the expression | |
135 | is invalid. */ | |
136 | ||
137 | extern void dwarf2_compile_expr_to_ax (struct agent_expr *expr, | |
138 | struct axs_value *loc, | |
139 | struct gdbarch *arch, | |
140 | unsigned int addr_size, | |
141 | const gdb_byte *op_ptr, | |
142 | const gdb_byte *op_end, | |
143 | struct dwarf2_per_cu_data *per_cu); | |
144 | ||
111c6489 JK |
145 | /* Determined tail calls for constructing virtual tail call frames. */ |
146 | ||
147 | struct call_site_chain | |
148 | { | |
149 | /* Initially CALLERS == CALLEES == LENGTH. For partially ambiguous result | |
150 | CALLERS + CALLEES < LENGTH. */ | |
151 | int callers, callees, length; | |
152 | ||
153 | /* Variably sized array with LENGTH elements. Later [0..CALLERS-1] contain | |
154 | top (GDB "prev") sites and [LENGTH-CALLEES..LENGTH-1] contain bottom | |
155 | (GDB "next") sites. One is interested primarily in the PC field. */ | |
156 | struct call_site *call_site[1]; | |
157 | }; | |
158 | ||
159 | struct call_site_stuff; | |
160 | extern struct call_site_chain *call_site_find_chain (struct gdbarch *gdbarch, | |
161 | CORE_ADDR caller_pc, | |
162 | CORE_ADDR callee_pc); | |
163 | ||
852483bc | 164 | #endif /* dwarf2loc.h */ |