1 /* SPDX-License-Identifier: GPL-2.0-or-later */
5 * dwarf-aux.h : libdw auxiliary interfaces
9 #include <elfutils/libdw.h>
10 #include <elfutils/libdwfl.h>
11 #include <elfutils/version.h>
15 /* Find the realpath of the target file */
16 const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname);
18 /* Get DW_AT_comp_dir (should be NULL with older gcc) */
19 const char *cu_get_comp_dir(Dwarf_Die *cu_die);
21 /* Get a line number and file name for given address */
22 int cu_find_lineinfo(Dwarf_Die *cudie, Dwarf_Addr addr,
23 const char **fname, int *lineno);
25 /* Walk on functions at given address */
26 int cu_walk_functions_at(Dwarf_Die *cu_die, Dwarf_Addr addr,
27 int (*callback)(Dwarf_Die *, void *), void *data);
29 /* Get DW_AT_linkage_name (should be NULL for C binary) */
30 const char *die_get_linkage_name(Dwarf_Die *dw_die);
32 /* Get the lowest PC in DIE (including range list) */
33 int die_entrypc(Dwarf_Die *dw_die, Dwarf_Addr *addr);
35 /* Ensure that this DIE is a subprogram and definition (not declaration) */
36 bool die_is_func_def(Dwarf_Die *dw_die);
38 /* Ensure that this DIE is an instance of a subprogram */
39 bool die_is_func_instance(Dwarf_Die *dw_die);
41 /* Compare diename and tname */
42 bool die_compare_name(Dwarf_Die *dw_die, const char *tname);
44 /* Matching diename with glob pattern */
45 bool die_match_name(Dwarf_Die *dw_die, const char *glob);
47 /* Get callsite line number of inline-function instance */
48 int die_get_call_lineno(Dwarf_Die *in_die);
50 /* Get callsite file name of inlined function instance */
51 const char *die_get_call_file(Dwarf_Die *in_die);
53 /* Get declared file name of a DIE */
54 const char *die_get_decl_file(Dwarf_Die *dw_die);
57 Dwarf_Die *die_get_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem);
59 /* Get a type die, but skip qualifiers */
60 Dwarf_Die *__die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem);
61 /* Get a type die, but skip qualifiers and typedef */
62 Dwarf_Die *die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem);
64 /* Check whether the DIE is signed or not */
65 bool die_is_signed_type(Dwarf_Die *tp_die);
67 /* Get data_member_location offset */
68 int die_get_data_member_location(Dwarf_Die *mb_die, Dwarf_Word *offs);
70 /* Return values for die_find_child() callbacks */
72 DIE_FIND_CB_END = 0, /* End of Search */
73 DIE_FIND_CB_CHILD = 1, /* Search only children */
74 DIE_FIND_CB_SIBLING = 2, /* Search only siblings */
75 DIE_FIND_CB_CONTINUE = 3, /* Search children and siblings */
78 /* Search child DIEs */
79 Dwarf_Die *die_find_child(Dwarf_Die *rt_die,
80 int (*callback)(Dwarf_Die *, void *),
81 void *data, Dwarf_Die *die_mem);
83 /* Search a non-inlined function including given address */
84 Dwarf_Die *die_find_realfunc(Dwarf_Die *cu_die, Dwarf_Addr addr,
87 /* Search a non-inlined function with tail call at given address */
88 Dwarf_Die *die_find_tailfunc(Dwarf_Die *cu_die, Dwarf_Addr addr,
91 /* Search the top inlined function including given address */
92 Dwarf_Die *die_find_top_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr,
95 /* Search the deepest inlined function including given address */
96 Dwarf_Die *die_find_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr,
99 /* Search a non-inlined function by name and returns its return type */
100 Dwarf_Die *die_find_func_rettype(Dwarf_Die *sp_die, const char *name,
103 /* Walk on the instances of given DIE */
104 int die_walk_instances(Dwarf_Die *in_die,
105 int (*callback)(Dwarf_Die *, void *), void *data);
107 /* Walker on lines (Note: line number will not be sorted) */
108 typedef int (* line_walk_callback_t) (const char *fname, int lineno,
109 Dwarf_Addr addr, void *data);
112 * Walk on lines inside given DIE. If the DIE is a subprogram, walk only on
113 * the lines inside the subprogram, otherwise the DIE must be a CU DIE.
115 int die_walk_lines(Dwarf_Die *rt_die, line_walk_callback_t callback, void *data);
117 /* Find a variable called 'name' at given address */
118 Dwarf_Die *die_find_variable_at(Dwarf_Die *sp_die, const char *name,
119 Dwarf_Addr addr, Dwarf_Die *die_mem);
121 /* Find a member called 'name' */
122 Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name,
125 /* Get the name of given type DIE */
126 int die_get_typename_from_type(Dwarf_Die *type_die, struct strbuf *buf);
128 /* Get the name of given variable DIE */
129 int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf);
131 /* Get the name and type of given variable DIE, stored as "type\tname" */
132 int die_get_varname(Dwarf_Die *vr_die, struct strbuf *buf);
134 /* Check if target program is compiled with optimization */
135 bool die_is_optimized_target(Dwarf_Die *cu_die);
137 /* Use next address after prologue as probe location */
138 void die_skip_prologue(Dwarf_Die *sp_die, Dwarf_Die *cu_die,
139 Dwarf_Addr *entrypc);
141 /* Get the list of including scopes */
142 int die_get_scopes(Dwarf_Die *cu_die, Dwarf_Addr pc, Dwarf_Die **scopes);
144 /* Variable type information */
145 struct die_var_type {
146 struct die_var_type *next;
153 /* Return type info of a member at offset */
154 Dwarf_Die *die_get_member_type(Dwarf_Die *type_die, int offset, Dwarf_Die *die_mem);
156 /* Return type info where the pointer and offset point to */
157 Dwarf_Die *die_deref_ptr_type(Dwarf_Die *ptr_die, int offset, Dwarf_Die *die_mem);
159 /* Get byte offset range of given variable DIE */
160 int die_get_var_range(Dwarf_Die *sp_die, Dwarf_Die *vr_die, struct strbuf *buf);
162 /* Find a variable saved in the 'reg' at given address */
163 Dwarf_Die *die_find_variable_by_reg(Dwarf_Die *sc_die, Dwarf_Addr pc, int reg,
164 int *poffset, bool is_fbreg,
167 /* Find a (global) variable located in the 'addr' */
168 Dwarf_Die *die_find_variable_by_addr(Dwarf_Die *sc_die, Dwarf_Addr addr,
169 Dwarf_Die *die_mem, int *offset);
171 /* Save all variables and parameters in this scope */
172 void die_collect_vars(Dwarf_Die *sc_die, struct die_var_type **var_types);
174 /* Save all global variables in this CU */
175 void die_collect_global_vars(Dwarf_Die *cu_die, struct die_var_type **var_types);
177 /* Get the frame base information from CFA */
178 int die_get_cfa(Dwarf *dwarf, u64 pc, int *preg, int *poffset);
180 #endif /* _DWARF_AUX_H */