dwarf_get_aranges —
retrieve program address space mappings
DWARF Access Library (libdwarf, -ldwarf)
#include
<libdwarf.h>
int
dwarf_get_aranges(
Dwarf_Debug
dbg,
Dwarf_Arange **ar_list,
Dwarf_Signed *ar_cnt,
Dwarf_Error *err);
The function
dwarf_get_aranges() retrieves address
range information from the “.debug_aranges” DWARF section.
Information about address ranges is returned using opaque descriptors of type
Dwarf_Arange,
Argument
dbg should reference a DWARF debug
context allocated using
dwarf_init(3).
Argument
ar_list should point to a location
which will be set to a pointer to an array of
Dwarf_Arange descriptors.
Argument
ar_cnt should point to a location
which will be set to the number of descriptors returned.
If argument
err is not NULL, it will be used to
store error information in case of an error.
The memory area used for the array returned in argument
ar_list is owned by
DWARF Access Library (libdwarf, -ldwarf).
Application code should not attempt to directly free this area. Portable
applications should instead use
dwarf_dealloc(3) to
indicate that the memory area may be freed.
Function
dwarf_get_aranges() returns
DW_DLV_OK
when it succeeds. It returns
DW_DLV_NO_ENTRY
if there is no
“.debug_aranges” section associated with the specified debugging
context. In case of an error, it returns
DW_DLV_ERROR
and sets the argument
err.
To loop through all the address lookup table entries, use:
Dwarf_Debug dbg;
Dwarf_Addr start;
Dwarf_Arange *aranges;
Dwarf_Off die_off;
Dwarf_Signed i, cnt;
Dwarf_Unsigned length;
Dwarf_Error de;
if (dwarf_get_aranges(dbg, &aranges, &cnt, &de) != DW_DLV_OK)
errx(EXIT_FAILURE, "dwarf_get_aranges: %s",
dwarf_errmsg(de));
for (i = 0; i < cnt; i++) {
if (dwarf_get_arange_info(aranges[i], &start, &length,
&die_off, &de) != DW_DLV_OK) {
warnx("dwarf_get_arange_info: %s",
dwarf_errmsg(de));
continue;
}
/* Do something with the returned information. */
}
Function
dwarf_get_aranges() can fail with:
-
-
- [
DW_DLE_ARGUMENT
]
- One of the arguments dbg,
ar_list or
ar_cnt was NULL.
-
-
- [
DW_DLE_NO_ENTRY
]
- The debugging context dbg
did not contain a “.debug_aranges” string section.
dwarf(3),
dwarf_get_arange(3),
dwarf_get_arange_cu_header_offset(3),
dwarf_get_arange_info(3),
dwarf_get_cu_die_offset(3)