aa601e3075
Integration testing shows this patch fixes all 9 known false positives
from -Wanalyzer-deref-before-check within ImageMagick-7.1.0-57, and
eliminates 34 further as-yet unassessed such diagnostics, without
eliminating the 1 known true positive.
This improves the rate of true positives for the warning from
1.56% to 4.76% of the total:
-Wanalyzer-deref-before-check: 1.56% -> 4.76% (GOOD: 1 BAD: 63->20)
TRUE: 1
FALSE: 15 -> 6 (-9)
ImageMagick-7.1.0-57: 9 -> 0 (-9)
TODO: 48 -> 14 (-34)
ImageMagick-7.1.0-57: 21 -> 1 (-20)
qemu-7.2.0: 25 -> 11 (-14)
gcc/analyzer/ChangeLog:
PR analyzer/108745
* sm-malloc.cc (deref_before_check::emit): Reject the warning if
the check occurs within a macro defintion.
gcc/testsuite/ChangeLog:
PR analyzer/108745
* gcc.dg/analyzer/deref-before-check-macro-pr108745.c: New test.
* gcc.dg/analyzer/deref-before-check-macro.c: New test.
Signed-off-by: David Malcolm <dmalcolm@redhat.com>
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