cc68ad8701
PR analyzer/104274 reports a false positive from -Wanalyzer-use-of-uninitialized-value on hppa when passing an empty struct as a function parameter. pa_pass_by_reference returns true for empty structs, so the call is turned into: struct empty arg.0; arg.0 = arg called_function (arg.0); by gimplify_parameters. However, gimplify_modify_expr discards assignments statments of empty types, so that we end up with: struct empty arg.0; called_function (arg.0); which the analyzer considers to be a use of uninitialized "arg.0"; Given that gimplify_modify_expr will discard any assignments to such types, it seems simplest for -Wanalyzer-use-of-uninitialized-value to ignore values of empty types. gcc/analyzer/ChangeLog: PR analyzer/104274 * region-model.cc (region_model::check_for_poison): Ignore uninitialized uses of empty types. gcc/testsuite/ChangeLog: PR analyzer/104274 * gcc.dg/analyzer/torture/empty-struct-1.c: New test. Signed-off-by: David Malcolm <dmalcolm@redhat.com> |
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