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* dwarf2loc.c (debug_loc_kind): Add DEBUG_LOC_START_LENGTH.

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(DEBUG_LOC_START_END): Renamed from DEBUG_LOC_NORMAL.
	All uses updated.
	(decode_debug_loc_dwo_addresses): New arg "byte_order".  All callers
	updated.  Handle DEBUG_LOC_START_LENGTH.
	(dwarf2_find_location_expression): Handle DEBUG_LOC_START_LENGTH.
	(loclist_describe_location): Ditto.
This commit is contained in:
Doug Evans
2012-06-14 22:56:47 +00:00
parent 1c5a993ebd
commit 3771a44cf0
2 changed files with 39 additions and 9 deletions
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10
gdb/ChangeLog
View File

@ -1,3 +1,13 @@
2012-06-14 Doug Evans <dje@google.com>
* dwarf2loc.c (debug_loc_kind): Add DEBUG_LOC_START_LENGTH.
(DEBUG_LOC_START_END): Renamed from DEBUG_LOC_NORMAL.
All uses updated.
(decode_debug_loc_dwo_addresses): New arg "byte_order". All callers
updated. Handle DEBUG_LOC_START_LENGTH.
(dwarf2_find_location_expression): Handle DEBUG_LOC_START_LENGTH.
(loclist_describe_location): Ditto.
2012-06-14 Maciej W. Rozycki <macro@codesourcery.com> 2012-06-14 Maciej W. Rozycki <macro@codesourcery.com>
PR backtrace/13866 PR backtrace/13866

38
gdb/dwarf2loc.c
View File

@ -75,7 +75,13 @@ enum debug_loc_kind
/* This is followed by two unsigned LEB128 numbers that are indices into /* This is followed by two unsigned LEB128 numbers that are indices into
.debug_addr and specify the beginning and ending addresses, and then .debug_addr and specify the beginning and ending addresses, and then
a normal location expression as in .debug_loc. */ a normal location expression as in .debug_loc. */
DEBUG_LOC_NORMAL = 2, DEBUG_LOC_START_END = 2,
/* This is followed by an unsigned LEB128 number that is an index into
.debug_addr and specifies the beginning address, and a 4 byte unsigned
number that specifies the length, and then a normal location expression
as in .debug_loc. */
DEBUG_LOC_START_LENGTH = 3,
/* An internal value indicating there is insufficient data. */ /* An internal value indicating there is insufficient data. */
DEBUG_LOC_BUFFER_OVERFLOW = -1, DEBUG_LOC_BUFFER_OVERFLOW = -1,
@ -124,7 +130,7 @@ decode_debug_loc_addresses (const gdb_byte *loc_ptr, const gdb_byte *buf_end,
if (*low == 0 && *high == 0) if (*low == 0 && *high == 0)
return DEBUG_LOC_END_OF_LIST; return DEBUG_LOC_END_OF_LIST;
return DEBUG_LOC_NORMAL; return DEBUG_LOC_START_END;
} }
/* Decode the addresses in .debug_loc.dwo entry. /* Decode the addresses in .debug_loc.dwo entry.
@ -137,7 +143,8 @@ decode_debug_loc_dwo_addresses (struct dwarf2_per_cu_data *per_cu,
const gdb_byte *loc_ptr, const gdb_byte *loc_ptr,
const gdb_byte *buf_end, const gdb_byte *buf_end,
const gdb_byte **new_ptr, const gdb_byte **new_ptr,
CORE_ADDR *low, CORE_ADDR *high) CORE_ADDR *low, CORE_ADDR *high,
enum bfd_endian byte_order)
{ {
uint64_t low_index, high_index; uint64_t low_index, high_index;
@ -157,7 +164,7 @@ decode_debug_loc_dwo_addresses (struct dwarf2_per_cu_data *per_cu,
*high = dwarf2_read_addr_index (per_cu, high_index); *high = dwarf2_read_addr_index (per_cu, high_index);
*new_ptr = loc_ptr; *new_ptr = loc_ptr;
return DEBUG_LOC_BASE_ADDRESS; return DEBUG_LOC_BASE_ADDRESS;
case DEBUG_LOC_NORMAL: case DEBUG_LOC_START_END:
loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &low_index); loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &low_index);
if (loc_ptr == NULL) if (loc_ptr == NULL)
return DEBUG_LOC_BUFFER_OVERFLOW; return DEBUG_LOC_BUFFER_OVERFLOW;
@ -167,7 +174,18 @@ decode_debug_loc_dwo_addresses (struct dwarf2_per_cu_data *per_cu,
return DEBUG_LOC_BUFFER_OVERFLOW; return DEBUG_LOC_BUFFER_OVERFLOW;
*high = dwarf2_read_addr_index (per_cu, high_index); *high = dwarf2_read_addr_index (per_cu, high_index);
*new_ptr = loc_ptr; *new_ptr = loc_ptr;
return DEBUG_LOC_NORMAL; return DEBUG_LOC_START_END;
case DEBUG_LOC_START_LENGTH:
loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &low_index);
if (loc_ptr == NULL)
return DEBUG_LOC_BUFFER_OVERFLOW;
*low = dwarf2_read_addr_index (per_cu, low_index);
if (loc_ptr + 4 > buf_end)
return DEBUG_LOC_BUFFER_OVERFLOW;
*high = *low;
*high += extract_unsigned_integer (loc_ptr, 4, byte_order);
*new_ptr = loc_ptr + 4;
return DEBUG_LOC_START_LENGTH;
default: default:
return DEBUG_LOC_INVALID_ENTRY; return DEBUG_LOC_INVALID_ENTRY;
} }
@ -208,7 +226,7 @@ dwarf2_find_location_expression (struct dwarf2_loclist_baton *baton,
if (baton->from_dwo) if (baton->from_dwo)
kind = decode_debug_loc_dwo_addresses (baton->per_cu, kind = decode_debug_loc_dwo_addresses (baton->per_cu,
loc_ptr, buf_end, &new_ptr, loc_ptr, buf_end, &new_ptr,
&low, &high); &low, &high, byte_order);
else else
kind = decode_debug_loc_addresses (loc_ptr, buf_end, &new_ptr, kind = decode_debug_loc_addresses (loc_ptr, buf_end, &new_ptr,
&low, &high, &low, &high,
@ -223,7 +241,8 @@ dwarf2_find_location_expression (struct dwarf2_loclist_baton *baton,
case DEBUG_LOC_BASE_ADDRESS: case DEBUG_LOC_BASE_ADDRESS:
base_address = high + base_offset; base_address = high + base_offset;
continue; continue;
case DEBUG_LOC_NORMAL: case DEBUG_LOC_START_END:
case DEBUG_LOC_START_LENGTH:
break; break;
case DEBUG_LOC_BUFFER_OVERFLOW: case DEBUG_LOC_BUFFER_OVERFLOW:
case DEBUG_LOC_INVALID_ENTRY: case DEBUG_LOC_INVALID_ENTRY:
@ -3979,7 +3998,7 @@ loclist_describe_location (struct symbol *symbol, CORE_ADDR addr,
if (dlbaton->from_dwo) if (dlbaton->from_dwo)
kind = decode_debug_loc_dwo_addresses (dlbaton->per_cu, kind = decode_debug_loc_dwo_addresses (dlbaton->per_cu,
loc_ptr, buf_end, &new_ptr, loc_ptr, buf_end, &new_ptr,
&low, &high); &low, &high, byte_order);
else else
kind = decode_debug_loc_addresses (loc_ptr, buf_end, &new_ptr, kind = decode_debug_loc_addresses (loc_ptr, buf_end, &new_ptr,
&low, &high, &low, &high,
@ -3996,7 +4015,8 @@ loclist_describe_location (struct symbol *symbol, CORE_ADDR addr,
fprintf_filtered (stream, _(" Base address %s"), fprintf_filtered (stream, _(" Base address %s"),
paddress (gdbarch, base_address)); paddress (gdbarch, base_address));
continue; continue;
case DEBUG_LOC_NORMAL: case DEBUG_LOC_START_END:
case DEBUG_LOC_START_LENGTH:
break; break;
case DEBUG_LOC_BUFFER_OVERFLOW: case DEBUG_LOC_BUFFER_OVERFLOW:
case DEBUG_LOC_INVALID_ENTRY: case DEBUG_LOC_INVALID_ENTRY: