On Mon, Apr 06, 2020 at 10:47:49AM -0400, Jason Merrill via Gcc-patches wrote: > On 4/4/20 1:56 PM, Marek Polacek wrote: > > On Fri, Apr 03, 2020 at 10:39:49PM -0400, Jason Merrill via Gcc-patches > > wrote: > > > On 4/3/20 9:08 PM, Marek Polacek wrote: > > > > On Fri, Apr 03, 2020 at 03:01:37PM -0400, Jason Merrill via Gcc-patches > > > > wrote: > > > > > On 3/30/20 4:28 PM, Marek Polacek wrote: > > > > > > Here we crash in the gimplifier because gimplify_init_ctor_eval > > > > > > doesn't > > > > > > expect null indexes for a constructor: > > > > > > > > > > > > /* ??? Here's to hoping the front end fills in all of the > > > > > > indices, > > > > > > so we don't have to figure out what's missing > > > > > > ourselves. */ > > > > > > gcc_assert (purpose); > > > > > > > > > > > > The indexes weren't filled because we never called reshape_init: for > > > > > > a constructor that represents parenthesized initialization of an > > > > > > aggregate we don't allow brace elision or designated initializers. > > > > > > So > > > > > > fill in the indexes manually, here we have an array, and we can > > > > > > simply > > > > > > assign indexes starting from 0. > > > > > > > > > > > > Bootstrapped/regtested on x86_64-linux, ok for trunk? > > > > > > > > > > Shouldn't digest_init fill in the indexes? In > > > > > process_init_constructor_array I see > > > > > > > > > > if (!ce->index) > > > > > ce->index = size_int (i); > > > > > > > > Yes, that works too. Thus: > > > > > > > > Bootstrapped/regtested on x86_64-linux, ok for trunk? > > > > > > > > -- >8 -- > > > > Here we crash in the gimplifier because gimplify_init_ctor_eval doesn't > > > > expect null indexes for a constructor: > > > > > > > > /* ??? Here's to hoping the front end fills in all of the > > > > indices, > > > > so we don't have to figure out what's missing ourselves. */ > > > > gcc_assert (purpose); > > > > > > > > The indexes weren't filled because we never called reshape_init: for > > > > a constructor that represents parenthesized initialization of an > > > > aggregate we don't allow brace elision or designated initializers. So > > > > call digest_init to fill in the indexes. > > > > > > > > Bootstrapped/regtested on x86_64-linux, ok for trunk? > > > > > > > > PR c++/94155 - crash in gimplifier with paren init of > > > > aggregates. > > > > * decl.c (check_initializer): Call digest_init. > > > > > > > > * g++.dg/cpp2a/paren-init22.C: New test. > > > > --- > > > > gcc/cp/decl.c | 5 +++++ > > > > gcc/testsuite/g++.dg/cpp2a/paren-init22.C | 15 +++++++++++++++ > > > > 2 files changed, 20 insertions(+) > > > > create mode 100644 gcc/testsuite/g++.dg/cpp2a/paren-init22.C > > > > > > > > diff --git a/gcc/cp/decl.c b/gcc/cp/decl.c > > > > index 69a238997b4..63e7bda09f5 100644 > > > > --- a/gcc/cp/decl.c > > > > +++ b/gcc/cp/decl.c > > > > @@ -6754,6 +6754,11 @@ check_initializer (tree decl, tree init, int > > > > flags, vec<tree, va_gc> **cleanups) > > > > init = build_constructor_from_list (init_list_type_node, > > > > init); > > > > CONSTRUCTOR_IS_DIRECT_INIT (init) = true; > > > > CONSTRUCTOR_IS_PAREN_INIT (init) = true; > > > > + /* The gimplifier expects that the front end fills in all > > > > of the > > > > + indices. Normally, reshape_init_array fills these in, > > > > but we > > > > + don't call reshape_init because that does nothing when > > > > it gets > > > > + CONSTRUCTOR_IS_PAREN_INIT. */ > > > > + init = digest_init (type, init, tf_warning_or_error); > > > > > > But why weren't we already calling digest_init in store_init_value? Was > > > the > > > CONSTRUCTOR making it all the way to gimplification still having > > > init_list_type_node? > > > > It's because we set LOOKUP_ALREADY_DIGESTED a few lines below: > > 6813 /* Don't call digest_init; it's unnecessary and will > > complain > > 6814 about aggregate initialization of non-aggregate > > classes. */ > > 6815 flags |= LOOKUP_ALREADY_DIGESTED; > > and so store_init_value doesn't digest. Given the comment I'd be nervous > > about > > not setting that flag here. > > OK, then why isn't it called by build_aggr_init? How is the CONSTRUCTOR > getting a type without this being fixed up? > > ... > > Ah, because build_vec_init builds up a new CONSTRUCTOR and gives it a type > without setting the indexes like process_init_constructor_array does: > > Jason
> diff --git a/gcc/cp/init.c b/gcc/cp/init.c > index 27623cf4db1..ea95a3bc910 100644 > --- a/gcc/cp/init.c > +++ b/gcc/cp/init.c > @@ -4438,6 +4438,8 @@ build_vec_init (tree base, tree maxindex, tree init, > errors = true; > if (try_const) > { > + if (!field) > + field = size_int (idx); > tree e = maybe_constant_init (one_init); > if (reduced_constant_expression_p (e)) > { That works, thanks for figuring that out. Bootstrapped/regtested on x86_64-pc-linux-gnu, ok for trunk? -- >8 -- Here we crash in the gimplifier because gimplify_init_ctor_eval doesn't expect null indexes for a constructor: /* ??? Here's to hoping the front end fills in all of the indices, so we don't have to figure out what's missing ourselves. */ gcc_assert (purpose); The indexes weren't filled because we never called reshape_init: for a constructor that represents parenthesized initialization of an aggregate we don't allow brace elision or designated initializers. PR c++/94155 - crash in gimplifier with paren init of aggregates. * init.c (build_vec_init): Fill in indexes. * g++.dg/cpp2a/paren-init22.C: New test. --- gcc/cp/init.c | 2 ++ gcc/testsuite/g++.dg/cpp2a/paren-init22.C | 15 +++++++++++++++ 2 files changed, 17 insertions(+) create mode 100644 gcc/testsuite/g++.dg/cpp2a/paren-init22.C diff --git a/gcc/cp/init.c b/gcc/cp/init.c index 27623cf4db1..ea95a3bc910 100644 --- a/gcc/cp/init.c +++ b/gcc/cp/init.c @@ -4438,6 +4438,8 @@ build_vec_init (tree base, tree maxindex, tree init, errors = true; if (try_const) { + if (!field) + field = size_int (idx); tree e = maybe_constant_init (one_init); if (reduced_constant_expression_p (e)) { diff --git a/gcc/testsuite/g++.dg/cpp2a/paren-init22.C b/gcc/testsuite/g++.dg/cpp2a/paren-init22.C new file mode 100644 index 00000000000..1b2959e7731 --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp2a/paren-init22.C @@ -0,0 +1,15 @@ +// PR c++/94155 - crash in gimplifier with paren init of aggregates. +// { dg-do compile { target c++2a } } + +struct S { int i, j; }; + +struct A { + S s; + constexpr A(S e) : s(e) {} +}; + +void +f() +{ + A g[1]({{1, 1}}); +} base-commit: c72a1b6f8b26de37d1a922a8af143af009747498 -- Marek Polacek • Red Hat, Inc. • 300 A St, Boston, MA