NAME
dwarf_get_aranges —
retrieve program
address space mappings
LIBRARY
DWARF Access Library (libdwarf, -ldwarf)
SYNOPSIS
#include <libdwarf.h>
int
dwarf_get_aranges(
Dwarf_Debug dbg,
Dwarf_Arange **ar_list,
Dwarf_Signed
*ar_cnt,
Dwarf_Error *err);
DESCRIPTION
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.
Memory Management
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.
RETURN VALUES
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.
ERRORS
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.
EXAMPLE
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. */
}
SEE ALSO
dwarf(3),
dwarf_get_arange(3),
dwarf_get_arange_cu_header_offset(3),
dwarf_get_arange_info(3),
dwarf_get_cu_die_offset(3)