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GDB: trad-frame: Store length of value_bytes in trad_frame_saved_reg

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The goal is to ensure that it is available in frame_unwind_got_bytes () to
make sure that the provided buf isn't larger than the size of the register
being provisioned.

In the process, regcache's cached_reg_t::data also needed to be
converted to a gdb::byte_vector, so that the register contents' size can
be tracked.

Approved-By: Simon Marchi <simon.marchi@efficios.com>
This commit is contained in:
Thiago Jung Bauermann
2024-08-22 19:42:45 -03:00
parent 1f493519f7
commit ad59259604
7 changed files with 35 additions and 22 deletions
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7
gdb/python/py-unwind.c
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@@ -812,7 +812,7 @@ pyuw_prev_register (const frame_info_ptr &this_frame, void **cache_ptr,
for (; reg_info < reg_info_end; ++reg_info)
{
if (regnum == reg_info->num)
return frame_unwind_got_bytes (this_frame, regnum, reg_info->data.get ());
return frame_unwind_got_bytes (this_frame, regnum, reg_info->data);
}
return frame_unwind_got_optimized (this_frame, regnum);
@@ -936,8 +936,9 @@ pyuw_sniffer (const struct frame_unwind *self, const frame_info_ptr &this_frame,
cached_reg_t *cached = new (&cached_frame->reg[i]) cached_reg_t ();
cached->num = reg->number;
cached->data.reset ((gdb_byte *) xmalloc (data_size));
memcpy (cached->data.get (), value->contents ().data (), data_size);
cached->data.resize (data_size);
gdb::array_view<const gdb_byte> contents = value->contents ();
cached->data.assign (contents.begin (), contents.end ());
}
}