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c++: Fix crash in gimplifier with paren init of aggregates [PR94155]

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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.
This commit is contained in:
Marek Polacek 2020-03-30 15:49:17 -04:00
parent c72a1b6f8b
commit f84aded848
4 changed files with 28 additions and 0 deletions
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6
gcc/cp/ChangeLog
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@ -1,3 +1,9 @@
2020-04-04 Marek Polacek <polacek@redhat.com>
Jason Merrill <jason@redhat.com>
PR c++/94155 - crash in gimplifier with paren init of aggregates.
* init.c (build_vec_init): Fill in indexes.
2020-04-04 Jason Merrill <jason@redhat.com>
PR c++/91377

2
gcc/cp/init.c
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@ -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))
{

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2020-04-04 Marek Polacek <polacek@redhat.com>
PR c++/94155 - crash in gimplifier with paren init of aggregates.
* g++.dg/cpp2a/paren-init22.C: New test.
2020-04-05 Iain Sandoe <iain@sandoe.co.uk>
* g++.dg/coroutines/torture/co-await-14-template-traits.C: Rename...

15
gcc/testsuite/g++.dg/cpp2a/paren-init22.C Normal file
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@ -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}});
}