7bd1e1296c
Here, -Wuse-after-free warns about using 'this' which, on ARM, cdtors return, as mandated by the EABI. To be entirely correct, it only requires it for C1 and C2 ctors and D2 and D1 dtors, but I don't feel like changing that now and possibly running into issues later on. This patch uses suppress_warning on 'this' for certain cdtor_returns_this cases in the C++ FE, and then warn_invalid_pointer makes use of this information and doesn't warn. In my first attempt I tried suppress_warning the MODIFY_EXPR or RETURN_EXPR we build in build_delete_destructor_body, but the complication is that the suppress_warning bits don't always survive gimplification; see e.g. gimplify_modify_expr where we do 6130 if (COMPARISON_CLASS_P (*from_p)) 6131 copy_warning (assign, *from_p); but here we're not dealing with a comparison. Removing that check regresses uninit-pr74762.C. Adding copy_warning (assign, *expr_p) regresses c-c++-common/uninit-17.c. PR target/104213 gcc/cp/ChangeLog: * decl.cc (finish_constructor_body): Suppress -Wuse-after-free. (finish_destructor_body): Likewise. * optimize.cc (build_delete_destructor_body): Likewise. gcc/ChangeLog: * gimple-ssa-warn-access.cc (pass_waccess::warn_invalid_pointer): Don't warn when the SSA_NAME_VAR of REF has supressed -Wuse-after-free. gcc/testsuite/ChangeLog: * g++.dg/warn/Wuse-after-free2.C: New test. * g++.dg/warn/Wuse-after-free3.C: New test. |
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