gdb/gdb-rhbz1420304-s390x-14of35.patch

71 lines
2.4 KiB
Diff

commit af547a9614969e1d1ea6fcec6b59cd77a606380f
Author: Andreas Arnez <arnez@linux.vnet.ibm.com>
Date: Tue Jun 13 15:20:27 2017 +0200
read/write_pieced_value: Respect value parent's offset
In the case of targeting a bit-field, read_pieced_value and
write_pieced_value calculate the number of bits preceding the bit-field
without considering the relative offset of the value's parent. This is
relevant for a structure variable like this:
struct s {
uint64_t foo;
struct {
uint32_t bar;
uint32_t bf : 10; /* <-- target bit-field */
} baz;
} s;
In this scenario, if 'val' is a GDB value representing s.baz.bf,
val->parent represents the whole s.baz structure, and the following holds:
- value_offset (val) == sizeof s.baz.bar == 4
- value_offset (val->parent) == sizeof s.foo == 8
The current logic would only use value_offset(val), resulting in the wrong
offset into the target value. This is fixed.
gdb/ChangeLog:
* dwarf2loc.c (read_pieced_value): Respect parent value's offset
when targeting a bit-field.
(write_pieced_value): Likewise.
### a/gdb/ChangeLog
### b/gdb/ChangeLog
## -1,5 +1,11 @@
2017-06-13 Andreas Arnez <arnez@linux.vnet.ibm.com>
+ * dwarf2loc.c (read_pieced_value): Respect parent value's offset
+ when targeting a bit-field.
+ (write_pieced_value): Likewise.
+
+2017-06-13 Andreas Arnez <arnez@linux.vnet.ibm.com>
+
* dwarf2loc.c (struct piece_closure) <addr_size>: Remove field.
(allocate_piece_closure): Drop addr_size parameter.
(dwarf2_evaluate_loc_desc_full): Adjust call to
--- a/gdb/dwarf2loc.c
+++ b/gdb/dwarf2loc.c
@@ -1776,7 +1776,8 @@ read_pieced_value (struct value *v)
bits_to_skip = 8 * value_offset (v);
if (value_bitsize (v))
{
- bits_to_skip += value_bitpos (v);
+ bits_to_skip += (8 * value_offset (value_parent (v))
+ + value_bitpos (v));
type_len = value_bitsize (v);
}
else
@@ -1946,7 +1947,8 @@ write_pieced_value (struct value *to, struct value *from)
bits_to_skip = 8 * value_offset (to);
if (value_bitsize (to))
{
- bits_to_skip += value_bitpos (to);
+ bits_to_skip += (8 * value_offset (value_parent (to))
+ + value_bitpos (to));
type_len = value_bitsize (to);
}
else