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* dwarf2read.c (dwarf2_add_member_fn): Handle correct form of 

DW_AT_vtable_elem_location even when GCC extension is seen.
This commit is contained in:
Tom Tromey 2010-06-11 20:01:06 +00:00
parent 7f01b0c676
commit aec5aa8bde
2 changed files with 40 additions and 30 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2010-06-11 Tom Tromey <tromey@redhat.com>
* dwarf2read.c (dwarf2_add_member_fn): Handle correct form of
DW_AT_vtable_elem_location even when GCC extension is seen.
2010-06-11 Tom Tromey <tromey@redhat.com> 2010-06-11 Tom Tromey <tromey@redhat.com>
PR gdb/9977, PR exp/11636: PR gdb/9977, PR exp/11636:

65
gdb/dwarf2read.c
View File

@ -4879,19 +4879,46 @@ dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
fnp->is_artificial = 1; fnp->is_artificial = 1;
/* Get index in virtual function table if it is a virtual member /* Get index in virtual function table if it is a virtual member
function. For GCC, this is an offset in the appropriate function. For older versions of GCC, this is an offset in the
virtual table, as specified by DW_AT_containing_type. For appropriate virtual table, as specified by DW_AT_containing_type.
everyone else, it is an expression to be evaluated relative For everyone else, it is an expression to be evaluated relative
to the object address. */ to the object address. */
attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu); attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
if (attr && fnp->fcontext) if (attr)
{ {
/* Support the .debug_loc offsets */ if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
if (attr_form_is_block (attr))
{ {
fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2; if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
} {
/* Old-style GCC. */
fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
}
else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
|| (DW_BLOCK (attr)->size > 1
&& DW_BLOCK (attr)->data[0] == DW_OP_deref_size
&& DW_BLOCK (attr)->data[1] == cu->header.addr_size))
{
struct dwarf_block blk;
int offset;
offset = (DW_BLOCK (attr)->data[0] == DW_OP_deref
? 1 : 2);
blk.size = DW_BLOCK (attr)->size - offset;
blk.data = DW_BLOCK (attr)->data + offset;
fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
if ((fnp->voffset % cu->header.addr_size) != 0)
dwarf2_complex_location_expr_complaint ();
else
fnp->voffset /= cu->header.addr_size;
fnp->voffset += 2;
}
else
dwarf2_complex_location_expr_complaint ();
if (!fnp->fcontext)
fnp->fcontext = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
}
else if (attr_form_is_section_offset (attr)) else if (attr_form_is_section_offset (attr))
{ {
dwarf2_complex_location_expr_complaint (); dwarf2_complex_location_expr_complaint ();
@ -4902,28 +4929,6 @@ dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
fieldname); fieldname);
} }
} }
else if (attr)
{
/* We only support trivial expressions here. This hack will work
for v3 classes, which always start with the vtable pointer. */
if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0
&& DW_BLOCK (attr)->data[0] == DW_OP_deref)
{
struct dwarf_block blk;
blk.size = DW_BLOCK (attr)->size - 1;
blk.data = DW_BLOCK (attr)->data + 1;
fnp->voffset = decode_locdesc (&blk, cu);
if ((fnp->voffset % cu->header.addr_size) != 0)
dwarf2_complex_location_expr_complaint ();
else
fnp->voffset /= cu->header.addr_size;
fnp->voffset += 2;
fnp->fcontext = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
}
else
dwarf2_complex_location_expr_complaint ();
}
else else
{ {
attr = dwarf2_attr (die, DW_AT_virtuality, cu); attr = dwarf2_attr (die, DW_AT_virtuality, cu);