125b57aa67
PR analyzer/108733 reports various false positives in qemu from
-Wanalyzer-use-of-uninitialized-value with __attribute__((cleanup))
at -O1 and above.
Root cause is that the state-purging code was failing to treat:
_25 = MEM[(void * *)&val];
as a usage of "val", leading to it erroneously purging the
initialization of "val" along an execution path that didn't otherwise
use "val", apart from the __attribute__((cleanup)).
Fixed thusly.
Integration testing on the patch show this change in the number of
diagnostics:
-Wanalyzer-use-of-uninitialized-value
coreutils-9.1: 18 -> 16 (-2)
qemu-7.2.0: 87 -> 80 (-7)
where all that I investigated appear to have been false positives, hence
an improvement.
gcc/analyzer/ChangeLog:
PR analyzer/108733
* state-purge.cc (get_candidate_for_purging): Add ADDR_EXPR
and MEM_REF.
gcc/testsuite/ChangeLog:
PR analyzer/108733
* gcc.dg/analyzer/torture/uninit-pr108733.c: New test.
Signed-off-by: David Malcolm <dmalcolm@redhat.com>
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