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Subject: [Bug 210798] devel/gdb: compile-loc2c.c's
 do_compile_dwarf_expr_to_c( . . . ) uses uoffset += . . . with uoffset
 uninitialized as of -r417989
Date: Sun, 03 Jul 2016 20:06:06 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D210798

--- Comment #1 from Mark Millard <markmi@dsl-only.net> ---
(In reply to Mark Millard from comment #0)

Another compiler-reported uninitialized value use follows.

/usr/obj/portswork/usr/ports/devel/gdb/work/gdb-7.11.1/gdb/rs6000-tdep.c (n=
ote
ra initialzxiation status):

static int
ppc_process_record_op31 (struct gdbarch *gdbarch, struct regcache *regcache,
                           CORE_ADDR addr, uint32_t insn)
{
. . .
  ULONGEST rb, ra, xer;
. . .
  switch (ext & 0x1ff)
    {
. . .
    case 1014:          /* Data Cache Block set to Zero */
. . .
      if (PPC_RA (insn) !=3D 0)
        regcache_raw_read_unsigned (regcache,
                                    tdep->ppc_gp0_regnum + PPC_RA (insn), &=
ra);
. . .
      ea =3D (ra + rb) & ~((ULONGEST) (at_dcsz - 1));
      record_full_arch_list_add_mem (ea, at_dcsz);
. . .

That last "ra" is always used in  case 1014 but was not potentially initial=
ized
unless the shown regcache_raw_read_unsigned call was made.

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