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Support for DWARF5 location lists entries 

This patch handles DW_LLE_base_addressx, DW_LLE_startx_length and
DW_LLE_start_length.

Tested by running the testsuite before and after the patch and there is
no increase in the number of test cases that fails. Tested with both
-gdwarf-4 and -gdwarf-5 flags. Also tested -gslit-dwarf along with
-gdwarf-4 as well as -gdwarf5 flags.

This is an effort to support DWARF5 in gdb.

gdb/ChangeLog:

	* dwarf2loc.c (decode_debug_loclists_addresses): Handle
	DW_LLE_base_addressx, DW_LLE_startx_length, DW_LLE_start_length.
This commit is contained in:
Nitika Achra 2020-01-16 11:51:06 -05:00 committed by Simon Marchi
parent 2da2eaf4ce
commit 3112ed9799
2 changed files with 44 additions and 0 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2020-01-16 Nitika Achra <Nitika.Achra@amd.com>
* dwarf2loc.c (decode_debug_loclists_addresses): Handle
DW_LLE_base_addressx, DW_LLE_startx_length, DW_LLE_start_length.
2020-01-15 Simon Marchi <simon.marchi@efficios.com>
* infcmd.c (post_create_inferior): Use get_thread_regcache

39
gdb/dwarf2loc.c
View File

@ -173,6 +173,41 @@ decode_debug_loclists_addresses (struct dwarf2_per_cu_data *per_cu,
switch (*loc_ptr++)
{
case DW_LLE_base_addressx:
*low = 0;
loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64);
if (loc_ptr == NULL)
return DEBUG_LOC_BUFFER_OVERFLOW;
*high = dwarf2_read_addr_index (per_cu, u64);
*new_ptr = loc_ptr;
return DEBUG_LOC_BASE_ADDRESS;
case DW_LLE_startx_length:
loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64);
if (loc_ptr == NULL)
return DEBUG_LOC_BUFFER_OVERFLOW;
*low = dwarf2_read_addr_index (per_cu, u64);
*high = *low;
loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64);
if (loc_ptr == NULL)
return DEBUG_LOC_BUFFER_OVERFLOW;
*high += u64;
*new_ptr = loc_ptr;
return DEBUG_LOC_START_LENGTH;
case DW_LLE_start_length:
if (buf_end - loc_ptr < addr_size)
return DEBUG_LOC_BUFFER_OVERFLOW;
if (signed_addr_p)
*low = extract_signed_integer (loc_ptr, addr_size, byte_order);
else
*low = extract_unsigned_integer (loc_ptr, addr_size, byte_order);
loc_ptr += addr_size;
*high = *low;
loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64);
if (loc_ptr == NULL)
return DEBUG_LOC_BUFFER_OVERFLOW;
*high += u64;
*new_ptr = loc_ptr;
return DEBUG_LOC_START_LENGTH;
case DW_LLE_end_of_list:
*new_ptr = loc_ptr;
return DEBUG_LOC_END_OF_LIST;
@ -197,6 +232,10 @@ decode_debug_loclists_addresses (struct dwarf2_per_cu_data *per_cu,
*high = u64;
*new_ptr = loc_ptr;
return DEBUG_LOC_START_END;
/* Following cases are not supported yet. */
case DW_LLE_startx_endx:
case DW_LLE_start_end:
case DW_LLE_default_location:
default:
return DEBUG_LOC_INVALID_ENTRY;
}