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* dwarf2expr.c (execute_stack_op): Handle DW_OP_GNU_const_index.

Browse Source 
Adjust address for DW_OP_GNU_addr_index.
	* dwarf2expr.h (dwarf_expr_context): Update comment.
	* dwarf2loc.c (locexpr_describe_location_piece): New arg per_cu,
	all callers updated.  Handle TLS vars described with
	DW_OP_GNU_const_index.
	(disassemble_dwarf_expression): Handle DW_OP_GNU_addr_index
	and DW_OP_GNU_const_index.
	* dwarf2read.c (decode_locdesc): Handle DW_OP_GNU_addr_index.
This commit is contained in:
Doug Evans 2012-06-19 00:37:18 +00:00
parent e48f889115
commit 49f6c8397d
5 changed files with 55 additions and 2 deletions
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10
gdb/ChangeLog
View File

@ -1,5 +1,15 @@
2012-06-18 Doug Evans <dje@google.com>
* dwarf2expr.c (execute_stack_op): Handle DW_OP_GNU_const_index.
Adjust address for DW_OP_GNU_addr_index.
* dwarf2expr.h (dwarf_expr_context): Update comment.
* dwarf2loc.c (locexpr_describe_location_piece): New arg per_cu,
all callers updated. Handle TLS vars described with
DW_OP_GNU_const_index.
(disassemble_dwarf_expression): Handle DW_OP_GNU_addr_index
and DW_OP_GNU_const_index.
* dwarf2read.c (decode_locdesc): Handle DW_OP_GNU_addr_index.
* block.c (find_block_in_blockvector): Make explicit the fact that we
ignore GLOBAL_BLOCK.

6
gdb/dwarf2expr.c
View File

@ -725,6 +725,12 @@ execute_stack_op (struct dwarf_expr_context *ctx,
break;
case DW_OP_GNU_addr_index:
op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset);
result = (ctx->funcs->get_addr_index) (ctx->baton, uoffset);
result += ctx->offset;
result_val = value_from_ulongest (address_type, result);
break;
case DW_OP_GNU_const_index:
op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset);
result = (ctx->funcs->get_addr_index) (ctx->baton, uoffset);
result_val = value_from_ulongest (address_type, result);

2
gdb/dwarf2expr.h
View File

@ -158,7 +158,7 @@ struct dwarf_expr_context
context and operations depending on DW_FORM_ref_addr are not allowed. */
int ref_addr_size;
/* Offset used to relocate DW_OP_addr argument. */
/* Offset used to relocate DW_OP_addr and DW_OP_GNU_addr_index arguments. */
CORE_ADDR offset;
/* An opaque argument provided by the caller, which will be passed

38
gdb/dwarf2loc.c
View File

@ -3293,10 +3293,12 @@ locexpr_regname (struct gdbarch *gdbarch, int dwarf_regnum)
static const gdb_byte *
locexpr_describe_location_piece (struct symbol *symbol, struct ui_file *stream,
CORE_ADDR addr, struct objfile *objfile,
struct dwarf2_per_cu_data *per_cu,
const gdb_byte *data, const gdb_byte *end,
unsigned int addr_size)
{
struct gdbarch *gdbarch = get_objfile_arch (objfile);
size_t leb128_size;
if (data[0] >= DW_OP_reg0 && data[0] <= DW_OP_reg31)
{
@ -3416,6 +3418,29 @@ locexpr_describe_location_piece (struct symbol *symbol, struct ui_file *stream,
data += 1 + addr_size + 1;
}
/* With -gsplit-dwarf a TLS variable can also look like this:
DW_AT_location : 3 byte block: fc 4 e0
(DW_OP_GNU_const_index: 4;
DW_OP_GNU_push_tls_address) */
else if (data + 3 <= end
&& data + 1 + (leb128_size = skip_leb128 (data + 1, end)) < end
&& data[0] == DW_OP_GNU_const_index
&& leb128_size > 0
&& data[1 + leb128_size] == DW_OP_GNU_push_tls_address
&& piece_end_p (data + 2 + leb128_size, end))
{
ULONGEST offset;
data = safe_read_uleb128 (data + 1, end, &offset);
offset = dwarf2_read_addr_index (per_cu, offset);
fprintf_filtered (stream,
_("a thread-local variable at offset 0x%s "
"in the thread-local storage for `%s'"),
phex_nz (offset, addr_size), objfile->name);
++data;
}
else if (data[0] >= DW_OP_lit0
&& data[0] <= DW_OP_lit31
&& data + 1 < end
@ -3771,6 +3796,17 @@ disassemble_dwarf_expression (struct ui_file *stream,
all, per_cu);
data += ul;
continue;
case DW_OP_GNU_addr_index:
data = safe_read_uleb128 (data, end, &ul);
ul = dwarf2_read_addr_index (per_cu, ul);
fprintf_filtered (stream, " 0x%s", phex_nz (ul, addr_size));
break;
case DW_OP_GNU_const_index:
data = safe_read_uleb128 (data, end, &ul);
ul = dwarf2_read_addr_index (per_cu, ul);
fprintf_filtered (stream, " %s", pulongest (ul));
break;
}
fprintf_filtered (stream, "\n");
@ -3805,7 +3841,7 @@ locexpr_describe_location_1 (struct symbol *symbol, CORE_ADDR addr,
if (!dwarf2_always_disassemble)
{
data = locexpr_describe_location_piece (symbol, stream,
addr, objfile,
addr, objfile, per_cu,
data, end, addr_size);
/* If we printed anything, or if we have an empty piece,
then don't disassemble. */

1
gdb/dwarf2read.c
View File

@ -15512,6 +15512,7 @@ decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
break;
case DW_OP_GNU_addr_index:
case DW_OP_GNU_const_index:
stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
&bytes_read);
i += bytes_read;