[PATCH] rtems-tools/covoar: -f switch was not used to select coverage format

Jiri Gaisler jiri at gaisler.se
Thu Jan 24 14:46:40 UTC 2019

On 1/24/19 2:19 PM, Joel Sherrill wrote:
> On Thu, Jan 24, 2019, 6:38 AM Jiri Gaisler <jiri at gaisler.se
> <mailto:jiri at gaisler.se> wrote:
>     Small patch to fix covoar to work with TSIM coverage files. It
>     should be noted that covoar erroneously marks some code as
>     uncovered while it is marked as covered in the coverage file. This
>     seems to be due to incorrect parsing of the symbol table in the
>     exec file. I will file a ticket for this on trac ..
> Is this the entry and exit code of a method or something else? The
> switch to dwarf info seems to have caused that and not marking
> assembly from inlined methods.

I notice two problems: the first instruction in a range is sometimes
marked as uncovered:

4000807c <_Freechain_Get>:
  Freechain_Control   *freechain,
  Freechain_Allocator  allocator,
  size_t               number_nodes_to_extend,
  size_t               node_size
4000807c:       9d e3 bf a0     save  %sp, -96, %sp
                           <== NOT EXECUTED
40008080:       ba 10 00 18     mov  %i0, %i5

  return _Chain_Immutable_head( the_chain )->next;

40008084:       f0 06 00 00     ld  [ %i0 ], %i0

even though it is marked as executed in the coverage file. The second
problems is that the size of ranges is sometimes off by one byte, e.g.
21 bytes instead of 20. This can only be seen when debugging covoar in gdb.

I will prepare a patch for sis to add the coverage, and then covoar can
be debugged using our standard tools. Maybe it could be a task for GSoC
...? An additional task could also be to add RISC-V support to covoar,
which is currently missing...

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