On Wed, Jul 19, 2023 at 02:32:15PM -0400, Patrick Palka wrote: > On Wed, 19 Jul 2023, Marek Polacek wrote: > > > Bootstrapped/regtested on x86_64-pc-linux-gnu, ok for trunk? > > LGTM. It might be preferable to check COMPLETE_TYPE_P in the caller > instead, so that we avoid inspecting CLASSTYPE_NON_AGGREGATE on an > incomplete class type, and so that the caller doesn't "commit" to > building an aggregate conversion.
Perhaps. I wanted to avoid the call to build_user_type_conversion_1. I could add an early return to implicit_conversion_1 but I'd have to move some code around not to check COMPLETE_TYPE_P before complete_type. > > > > -- >8 -- > > > > r13-1227 added an assert checking that the index in a CONSTRUCTOR > > is a FIELD_DECL. That's a reasonable assumption but in this case > > we never called reshape_init due to the type being incomplete, and > > so the index remained an identifier node: get_class_binding never > > got around to looking up the FIELD_DECL. > > > > We can avoid the crash by returning early in build_aggr_conv; we'd > > return NULL anyway due to: > > > > if (i < CONSTRUCTOR_NELTS (ctor)) > > return NULL; > > > > PR c++/110114 > > > > gcc/cp/ChangeLog: > > > > * call.cc (build_aggr_conv): Return early if the type isn't > > complete. > > > > gcc/testsuite/ChangeLog: > > > > * g++.dg/cpp2a/desig28.C: New test. > > * g++.dg/cpp2a/desig29.C: New test. > > --- > > gcc/cp/call.cc | 5 +++++ > > gcc/testsuite/g++.dg/cpp2a/desig28.C | 17 +++++++++++++++++ > > gcc/testsuite/g++.dg/cpp2a/desig29.C | 10 ++++++++++ > > 3 files changed, 32 insertions(+) > > create mode 100644 gcc/testsuite/g++.dg/cpp2a/desig28.C > > create mode 100644 gcc/testsuite/g++.dg/cpp2a/desig29.C > > > > diff --git a/gcc/cp/call.cc b/gcc/cp/call.cc > > index b55230d98aa..0af20a81717 100644 > > --- a/gcc/cp/call.cc > > +++ b/gcc/cp/call.cc > > @@ -986,6 +986,11 @@ build_aggr_conv (tree type, tree ctor, int flags, > > tsubst_flags_t complain) > > tree empty_ctor = NULL_TREE; > > hash_set<tree, true> pset; > > > > + /* We've called complete_type on TYPE before calling this function, but > > + perhaps it wasn't successful. */ > > + if (!COMPLETE_TYPE_P (type)) > > + return nullptr; > > + > > /* We already called reshape_init in implicit_conversion, but it might > > not > > have done anything in the case of parenthesized aggr init. */ > > > > diff --git a/gcc/testsuite/g++.dg/cpp2a/desig28.C > > b/gcc/testsuite/g++.dg/cpp2a/desig28.C > > new file mode 100644 > > index 00000000000..b63265fea51 > > --- /dev/null > > +++ b/gcc/testsuite/g++.dg/cpp2a/desig28.C > > @@ -0,0 +1,17 @@ > > +// PR c++/110114 > > +// { dg-do compile { target c++20 } } > > + > > +struct A { > > + int a,b; > > +}; > > + > > +struct B; > > + > > +void foo(const A &) {} > > +void foo(const B &) {} > > + > > +int > > +main () > > +{ > > + foo({.a=0}); > > +} > > diff --git a/gcc/testsuite/g++.dg/cpp2a/desig29.C > > b/gcc/testsuite/g++.dg/cpp2a/desig29.C > > new file mode 100644 > > index 00000000000..bd1a82b041d > > --- /dev/null > > +++ b/gcc/testsuite/g++.dg/cpp2a/desig29.C > > @@ -0,0 +1,10 @@ > > +// PR c++/110114 > > +// { dg-do compile { target c++20 } } > > + > > +struct B; > > + > > +void foo(const B &) {} > > + > > +int main() { > > + foo({.a=0}); // { dg-error "invalid" } > > +} > > > > base-commit: 2971ff7b1d564ac04b537d907c70e6093af70832 > > -- > > 2.41.0 > > > > > Marek