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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2#ifndef _DWARF_AUX_H
3#define _DWARF_AUX_H
4/*
5 * dwarf-aux.h : libdw auxiliary interfaces
6 */
7
8#include <dwarf.h>
9#include <elfutils/libdw.h>
10#include <elfutils/libdwfl.h>
11#include <elfutils/version.h>
12
13struct strbuf;
14
15/* Find the realpath of the target file */
16const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname);
17
18/* Get DW_AT_comp_dir (should be NULL with older gcc) */
19const char *cu_get_comp_dir(Dwarf_Die *cu_die);
20
21/* Get a line number and file name for given address */
22int cu_find_lineinfo(Dwarf_Die *cudie, unsigned long addr,
23 const char **fname, int *lineno);
24
25/* Walk on funcitons at given address */
26int cu_walk_functions_at(Dwarf_Die *cu_die, Dwarf_Addr addr,
27 int (*callback)(Dwarf_Die *, void *), void *data);
28
29/* Get DW_AT_linkage_name (should be NULL for C binary) */
30const char *die_get_linkage_name(Dwarf_Die *dw_die);
31
32/* Ensure that this DIE is a subprogram and definition (not declaration) */
33bool die_is_func_def(Dwarf_Die *dw_die);
34
35/* Ensure that this DIE is an instance of a subprogram */
36bool die_is_func_instance(Dwarf_Die *dw_die);
37
38/* Compare diename and tname */
39bool die_compare_name(Dwarf_Die *dw_die, const char *tname);
40
41/* Matching diename with glob pattern */
42bool die_match_name(Dwarf_Die *dw_die, const char *glob);
43
44/* Get callsite line number of inline-function instance */
45int die_get_call_lineno(Dwarf_Die *in_die);
46
47/* Get callsite file name of inlined function instance */
48const char *die_get_call_file(Dwarf_Die *in_die);
49
50/* Get type die */
51Dwarf_Die *die_get_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem);
52
53/* Get a type die, but skip qualifiers and typedef */
54Dwarf_Die *die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem);
55
56/* Check whether the DIE is signed or not */
57bool die_is_signed_type(Dwarf_Die *tp_die);
58
59/* Get data_member_location offset */
60int die_get_data_member_location(Dwarf_Die *mb_die, Dwarf_Word *offs);
61
62/* Return values for die_find_child() callbacks */
63enum {
64 DIE_FIND_CB_END = 0, /* End of Search */
65 DIE_FIND_CB_CHILD = 1, /* Search only children */
66 DIE_FIND_CB_SIBLING = 2, /* Search only siblings */
67 DIE_FIND_CB_CONTINUE = 3, /* Search children and siblings */
68};
69
70/* Search child DIEs */
71Dwarf_Die *die_find_child(Dwarf_Die *rt_die,
72 int (*callback)(Dwarf_Die *, void *),
73 void *data, Dwarf_Die *die_mem);
74
75/* Search a non-inlined function including given address */
76Dwarf_Die *die_find_realfunc(Dwarf_Die *cu_die, Dwarf_Addr addr,
77 Dwarf_Die *die_mem);
78
79/* Search a non-inlined function with tail call at given address */
80Dwarf_Die *die_find_tailfunc(Dwarf_Die *cu_die, Dwarf_Addr addr,
81 Dwarf_Die *die_mem);
82
83/* Search the top inlined function including given address */
84Dwarf_Die *die_find_top_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr,
85 Dwarf_Die *die_mem);
86
87/* Search the deepest inlined function including given address */
88Dwarf_Die *die_find_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr,
89 Dwarf_Die *die_mem);
90
91/* Walk on the instances of given DIE */
92int die_walk_instances(Dwarf_Die *in_die,
93 int (*callback)(Dwarf_Die *, void *), void *data);
94
95/* Walker on lines (Note: line number will not be sorted) */
96typedef int (* line_walk_callback_t) (const char *fname, int lineno,
97 Dwarf_Addr addr, void *data);
98
99/*
100 * Walk on lines inside given DIE. If the DIE is a subprogram, walk only on
101 * the lines inside the subprogram, otherwise the DIE must be a CU DIE.
102 */
103int die_walk_lines(Dwarf_Die *rt_die, line_walk_callback_t callback, void *data);
104
105/* Find a variable called 'name' at given address */
106Dwarf_Die *die_find_variable_at(Dwarf_Die *sp_die, const char *name,
107 Dwarf_Addr addr, Dwarf_Die *die_mem);
108
109/* Find a member called 'name' */
110Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name,
111 Dwarf_Die *die_mem);
112
113/* Get the name of given variable DIE */
114int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf);
115
116/* Get the name and type of given variable DIE, stored as "type\tname" */
117int die_get_varname(Dwarf_Die *vr_die, struct strbuf *buf);
118int die_get_var_range(Dwarf_Die *sp_die, Dwarf_Die *vr_die, struct strbuf *buf);
119
120/* Check if target program is compiled with optimization */
121bool die_is_optimized_target(Dwarf_Die *cu_die);
122
123/* Use next address after prologue as probe location */
124void die_skip_prologue(Dwarf_Die *sp_die, Dwarf_Die *cu_die,
125 Dwarf_Addr *entrypc);
126
127#endif