From 45e2bf2e5e370e62c3cef575b6726dc936a45599 Mon Sep 17 00:00:00 2001 From: Nathan Sidwell Date: Fri, 7 Oct 2016 20:01:17 +0000 Subject: [PATCH] re PR c++/64433 (Segmentation fault while compiling) cp/ PR c++/64433 DR1658, DR1611 * init.c (emit_mem_initializers): Don't construct vbases of abstract classes. (push_base_cleanups): Don't push vbase cleanups for abstract class when in C++14 mode. * method.c (synthethesized_method_walk): Don't walk vbases of abstract classes when in C++14 mode. testsuite/ PR c++/66443 * g++.dg/cpp0x/pr66443-cxx11.C: New. * g++.dg/cpp0x/pr66443-cxx11-2.C: New. * g++.dg/cpp1y/pr66443-cxx14.C: New * g++.dg/cpp1y/pr66443-cxx14-2.C: New. * g++.dg/cpp1y/pr66443-cxx14-3.C: New. From-SVN: r240874 --- gcc/cp/ChangeLog | 11 +++++++ gcc/cp/init.c | 11 ++++--- gcc/cp/method.c | 20 +++++++----- gcc/testsuite/ChangeLog | 9 ++++++ gcc/testsuite/g++.dg/cpp0x/pr66443-cxx11-2.C | 23 ++++++++++++++ gcc/testsuite/g++.dg/cpp0x/pr66443-cxx11.C | 30 ++++++++++++++++++ gcc/testsuite/g++.dg/cpp1y/pr66443-cxx14-2.C | 29 +++++++++++++++++ gcc/testsuite/g++.dg/cpp1y/pr66443-cxx14-3.C | 25 +++++++++++++++ gcc/testsuite/g++.dg/cpp1y/pr66443-cxx14.C | 47 ++++++++++++++++++++++++++++ 9 files changed, 193 insertions(+), 12 deletions(-) create mode 100644 gcc/testsuite/g++.dg/cpp0x/pr66443-cxx11-2.C create mode 100644 gcc/testsuite/g++.dg/cpp0x/pr66443-cxx11.C create mode 100644 gcc/testsuite/g++.dg/cpp1y/pr66443-cxx14-2.C create mode 100644 gcc/testsuite/g++.dg/cpp1y/pr66443-cxx14-3.C create mode 100644 gcc/testsuite/g++.dg/cpp1y/pr66443-cxx14.C diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog index ce875ce..da2ca07 100644 --- a/gcc/cp/ChangeLog +++ b/gcc/cp/ChangeLog @@ -1,3 +1,14 @@ +2016-10-07 Nathan Sidwell + + PR c++/64433 + DR1658, DR1611 + * init.c (emit_mem_initializers): Don't construct vbases of + abstract classes. + (push_base_cleanups): Don't push vbase cleanups for abstract class + when in C++14 mode. + * method.c (synthethesized_method_walk): Don't walk vbases of + abstract classes when in C++14 mode. + 2016-10-07 Jakub Jelinek Implement LWG2296 helper intrinsic diff --git a/gcc/cp/init.c b/gcc/cp/init.c index 63c3dab..a873bb1 100644 --- a/gcc/cp/init.c +++ b/gcc/cp/init.c @@ -1154,9 +1154,7 @@ emit_mem_initializers (tree mem_inits) } /* Initialize the base. */ - if (BINFO_VIRTUAL_P (subobject)) - construct_virtual_base (subobject, arguments); - else + if (!BINFO_VIRTUAL_P (subobject)) { tree base_addr; @@ -1170,6 +1168,10 @@ emit_mem_initializers (tree mem_inits) tf_warning_or_error); expand_cleanup_for_base (subobject, NULL_TREE); } + else if (!ABSTRACT_CLASS_TYPE_P (current_class_type)) + /* C++14 DR1658 Means we do not have to construct vbases of + abstract classes. */ + construct_virtual_base (subobject, arguments); } in_base_initializer = 0; @@ -4536,7 +4538,8 @@ push_base_cleanups (void) vec *vbases; /* Run destructors for all virtual baseclasses. */ - if (CLASSTYPE_VBASECLASSES (current_class_type)) + if (!ABSTRACT_CLASS_TYPE_P (current_class_type) + && CLASSTYPE_VBASECLASSES (current_class_type)) { tree cond = (condition_conversion (build2 (BIT_AND_EXPR, integer_type_node, diff --git a/gcc/cp/method.c b/gcc/cp/method.c index bbbf59b..73a670b 100644 --- a/gcc/cp/method.c +++ b/gcc/cp/method.c @@ -1319,12 +1319,12 @@ walk_field_subobs (tree fields, tree fnname, special_function_kind sfk, } } -/* The caller wants to generate an implicit declaration of SFK for CTYPE - which is const if relevant and CONST_P is set. If spec_p, trivial_p and - deleted_p are non-null, set their referent appropriately. If diag is - true, we're either being called from maybe_explain_implicit_delete to - give errors, or if constexpr_p is non-null, from - explain_invalid_constexpr_fn. */ +/* The caller wants to generate an implicit declaration of SFK for + CTYPE which is const if relevant and CONST_P is set. If SPEC_P, + TRIVIAL_P, DELETED_P or CONSTEXPR_P are non-null, set their + referent appropriately. If DIAG is true, we're either being called + from maybe_explain_implicit_delete to give errors, or if + CONSTEXPR_P is non-null, from explain_invalid_constexpr_fn. */ static void synthesized_method_walk (tree ctype, special_function_kind sfk, bool const_p, @@ -1534,9 +1534,13 @@ synthesized_method_walk (tree ctype, special_function_kind sfk, bool const_p, } vbases = CLASSTYPE_VBASECLASSES (ctype); - if (vec_safe_is_empty (vbases)) + if (assign_p) + /* No need to examine vbases here. */; + else if (vec_safe_is_empty (vbases)) /* No virtual bases to worry about. */; - else if (!assign_p) + else if (ABSTRACT_CLASS_TYPE_P (ctype) && cxx_dialect >= cxx14) + /* Vbase cdtors are not relevant. */; + else { if (constexpr_p) *constexpr_p = false; diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 07cfac4..4d79c78 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,12 @@ +2016-10-07 Nathan Sidwell + + PR c++/66443 + * g++.dg/cpp0x/pr66443-cxx11.C: New. + * g++.dg/cpp0x/pr66443-cxx11-2.C: New. + * g++.dg/cpp1y/pr66443-cxx14.C: New + * g++.dg/cpp1y/pr66443-cxx14-2.C: New. + * g++.dg/cpp1y/pr66443-cxx14-3.C: New. + 2016-10-07 Jakub Jelinek * g++.dg/cpp0x/addressof1.C: New test. diff --git a/gcc/testsuite/g++.dg/cpp0x/pr66443-cxx11-2.C b/gcc/testsuite/g++.dg/cpp0x/pr66443-cxx11-2.C new file mode 100644 index 0000000..4bd641d --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp0x/pr66443-cxx11-2.C @@ -0,0 +1,23 @@ +// { dg-do compile { target c++11_only } } + +class C; + + +struct A { + A (); +private: + ~A (){ } + friend class C; +}; + +struct B : virtual A { // { dg-error "is private" } + B (); + virtual bool Ok () = 0; // abstract +}; + +struct C : B { // { dg-error "use of deleted" } + C (); + virtual bool Ok (); +}; + +C c; // { dg-error "use of deleted" } diff --git a/gcc/testsuite/g++.dg/cpp0x/pr66443-cxx11.C b/gcc/testsuite/g++.dg/cpp0x/pr66443-cxx11.C new file mode 100644 index 0000000..7ba0074 --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp0x/pr66443-cxx11.C @@ -0,0 +1,30 @@ +// { dg-do compile { target c++11_only } } + +// pr c++/66443 it is still ill-formed in C++ 11 for a synthesized +// ctor that's deleted only because of virtual base construction + +static bool a_made; + +struct A { // { dg-message "candidate" } + A( int ) { a_made = true; } // { dg-message "candidate" } +}; + +struct B: virtual A { // { dg-message "no matching function" } + int m; + virtual void Frob () = 0; +}; + +class C: public B { +public: + C(); + virtual void Frob (); +}; + +void C::Frob () +{ +} + +C::C () + : A( 1 ) // { dg-error "deleted function" } +{ } + diff --git a/gcc/testsuite/g++.dg/cpp1y/pr66443-cxx14-2.C b/gcc/testsuite/g++.dg/cpp1y/pr66443-cxx14-2.C new file mode 100644 index 0000000..e033f1f --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp1y/pr66443-cxx14-2.C @@ -0,0 +1,29 @@ +// { dg-do compile { target c++14 } } + +// pr c++/66443 a synthesized ctor of an abstract class that's deleted +// only because of virtual base construction doesn't stop a derived +// class using it as a base object constructor (provided it has a +// suitable ctor invocation of the virtual base). + +// However we should still complain if the intermediate base is a +// non-abstract type. + +static int a_made; + +struct A { + A *m_a = this; + A (int) { a_made++; } +}; + +struct B : virtual A { // { dg-error "no matching function" } + A *m_b = this; + virtual bool Ok (); // not abstract +}; + +bool B::Ok () +{ + return false; +} + + +B b; // { dg-error "deleted" } diff --git a/gcc/testsuite/g++.dg/cpp1y/pr66443-cxx14-3.C b/gcc/testsuite/g++.dg/cpp1y/pr66443-cxx14-3.C new file mode 100644 index 0000000..b335c4b --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp1y/pr66443-cxx14-3.C @@ -0,0 +1,25 @@ +// { dg-do compile { target c++14 } } + +// DR 1658, inaccessible dtor of virtual base doesn't affect an +// abstract class + +int a_unmade; + +class C; + + +struct A { +private: + ~A (){ a_unmade++; } + friend class C; +}; + +struct B : virtual A { + virtual bool Ok () = 0; // abstract +}; + +struct C : B { + virtual bool Ok (); +}; + +C c; diff --git a/gcc/testsuite/g++.dg/cpp1y/pr66443-cxx14.C b/gcc/testsuite/g++.dg/cpp1y/pr66443-cxx14.C new file mode 100644 index 0000000..5834808 --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp1y/pr66443-cxx14.C @@ -0,0 +1,47 @@ +// { dg-do run { target c++14 } } + +// pr c++/66443 a synthesized ctor of an abstract class that's deleted +// only because of virtual base construction doesn't stop a derived +// class using it as a base object constructor (provided it has a +// suitable ctor invocation of the virtual base). + +static int a_made; + +struct A { + A *m_a = this; + A (int) { a_made++; } +}; + +struct B : virtual A { + A *m_b = this; + virtual bool Ok () = 0; // abstract +}; + +struct C : B { + // C::m_c is placed where a complete B object would put A + int m_c = 1729; +public: + C(); + virtual bool Ok (); +}; + +bool C::Ok () +{ + // check everyone agreed on where A is + return a_made == 1 && m_a == this && m_b == this && m_c == 1729; +} + +C::C () + : A (1) // Explicit call of A's ctor +{ } + +bool Ok (C &c) +{ +} + +int main () +{ + C c; + + return !c.Ok (); +} -- 2.7.4