df2b78d407
PR analyzer/94851 reports various false "NULL dereference" diagnostics. The first case (comment #1) affects GCC 10.2 but no longer affects trunk; I believe it was fixed by the state rewrite of r11-2694-g808f4dfeb3a95f50f15e71148e5c1067f90a126d. The patch adds a regression test for this case. The other cases (comment #3 and comment #4) still affect trunk. In both cases, the && in a conditional is optimized to bitwise & _1 = p_4 != 0B; _2 = p_4 != q_6(D); _3 = _1 & _2; and the analyzer fails to fold this for the case where one (or both) of the conditionals is false, and thus erroneously considers the path where "p" is non-NULL despite being passed a NULL value. Fix this by implementing folding for this case. gcc/analyzer/ChangeLog: PR analyzer/94851 * region-model-manager.cc (region_model_manager::maybe_fold_binop): Fold bitwise "& 0" to 0. gcc/testsuite/ChangeLog: PR analyzer/94851 * gcc.dg/analyzer/pr94851-1.c: New test. * gcc.dg/analyzer/pr94851-3.c: New test. * gcc.dg/analyzer/pr94851-4.c: New test. |
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